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770 Curated Videos · Brain-Score 75+/100

Build & Craft / Bauen & Handwerk

Curated woodworking, machining, CAD, 3D printing, mechanical builds, restoration, and workshop engineering videos with 3-point Blueprints.

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Brain-Score 97/100 Dan Gelbart · 10:34

High precision air bearing CNC lathe and grinder

  1. A scratch-built CNC lathe and grinder holds 1-micron tolerances, producing piston fits that spin as frictionless air bearings.
  2. Its bed achieves 1-micron accuracy by epoxy-bonding precision granite parallels upside down on a reference granite surface plate.
  3. Air-bearing axes, a watertight chuck with zero-runout screws, and waterjet-cut grinding wheels enable ultra-precise turning and grinding.
Air-bearing spindle & tailstockEpoxy-bonded granite parallelsWatertight zero-runout chuckWaterjet-cut grinding wheels1-micron metrology
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Brain-Score 96/100 Tom Stanton · 21:45

Supersonic Trebuchet

  1. Traditional gravity trebuchets hit a 9.81 m/s² free-fall limit, so a pulley-and-drum drive decouples arm speed from drop velocity.
  2. A 3D-printed tapered drum shifts from high initial torque to high speed, while vented guides and a light mount boost RPM by 17.8%.
  3. Spinning at 2,342 RPM, the arm launches its projectile at 346.4 m/s (776 mph), breaking the sound barrier using falling weight.
Tapered Torque-to-Speed DrumUHMWPE Pulley Drive RopeVented Aerodynamic Sling Guide3D-Printed Low-Mass Sling MountCNC Carbon Fiber & Metal Fabrication
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Brain-Score 96/100 New Mind · 25:02

The Surprising Problem With Measuring Anything

  1. Physical probing indents surfaces on contact, while steel expands 11–12 ppm per °C—over one micron per degree on a 100 mm bar.
  2. Johansson's lapped gauge blocks wring together via molecular attraction and a nanometer film to create stackable reference lengths.
  3. Ruby touch-trigger probes automated CNC metrology, while atomic force microscopes and silicon lattices measure down to atoms.
Johansson gauge blocks & wringingThermal expansion (11–12 ppm/°C)Whitworth three-plate methodRuby touch-trigger probeAtomic force microscopy (AFM)
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Brain-Score 96/100 ROBRENZ · 30:37

MAKING ULTRA PRECISION TOOLROOM SPINDLES #1

  1. Hardened A2 steel spindles achieve sub-5-millionths-inch TIR using lapped races and many Grade 5 balls for elastic averaging.
  2. The rear draw nut bears solely on the inner 5C collet body so clamping tension never alters bearing preload.
  3. Pre-heat-treat work pairs square surface grinding, burr-free air-purge cross-drilling, 24° taper turning, and 72-step indexing.
Elastic AveragingGrade 5 Bearing BallsHardened A2 Tool SteelPreload-Isolated 5C ColletSurface Grinding & Indexing
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Brain-Score 96/100 ROBRENZ · 41:53

AUTOCOLLIMATOR MIRROR SYSTEM

  1. An autocollimator measures angular tilt changes of a stepped mirror carriage to convert straightness lines into flatness maps.
  2. The carriage pairs lapped carbide feet and Turcite pivot pads with a differential screw giving an effective 440-TPI tilt adjustment.
  3. CAD web tuning centers gravity equidistantly between the feet while nylon-tipped screws and a spherical pivot mount the mirror.
Optical Autocollimator440-TPI Differential ScrewLapped Carbide FeetTurcite Bearing PadsSurface Plate Metrology
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Brain-Score 96/100 Dan Gelbart · 39:10

Novel High Resolution 3D Printing Method for Metals and Ceramics

  1. Combining micron-grade MIM powders with silicone molds reproduces micron-level features, undercuts, and 1 mm threads.
  2. Sintering the dried green part in a 12-hour furnace cycle yields 99%-dense solid metal ready for mirror electropolishing.
  3. The workflow delivers superior surface finish at low equipment cost—under $10,000 for ceramic parts.
MIM & PM Micron PowdersSilicone Micron Molding12-Hour Sintering FurnaceElectropolishingMetal & Ceramic 3D Printing
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Brain-Score 96/100 Clickspring · 16:47

The Antikythera Mechanism Episode 9 - Making The Epicyclic Pin and Slot Gearing

  1. The Antikythera lunar module models both elliptical orbital speed variations and apsidal precession of the anomalistic month.
  2. Two stacked gears rotate on slightly offset axes via a pin and radial slot, oscillating speed ahead and behind mean motion.
  3. Mounting this pair epicyclically on a rotating platform with stepped arbors and a coaxial shaft outputs true lunar phase motion.
Epicyclic Pin-and-Slot GearingEccentric Pivot MachiningAnomalistic Month ModelingCoaxial Output ShaftGear Depthing & Stepped Arbors
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Brain-Score 95/100 Clickspring · 10:55

Clockmaking - How To Make A Clock In The Home Machine Shop - Part 6 - Crossing Out The Wheels

  1. Brass clock wheel blanks are coated in layout fluid and scribed symmetrically on a center-pin J. Malcolm Wild indexing jig.
  2. Drilled entry holes allow scroll-saw waste removal before a vertical bench filer squares internal spoke corners.
  3. Safe-edge files (#2, #4, #6) with hardened guides, 600–800 grit paper, and steel burnishing produce mirror-finished spokes.
J. Malcolm Wild layout jigScroll saw roughingVertical bench filerSafe-edge escapement filesRodico & steel burnisher
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Brain-Score 95/100 Breaking Taps · 2:08

JWST Mirror Actuator

  1. Six actuators per hexagonal JWST mirror segment form a Stewart platform for nanometer-level kinematic alignment.
  2. A single stepper motor drives an offset camshaft and compliant flexure to achieve ultra-fine positioning.
  3. Rotating past ~320° engages coupling pins to drive a 1:8 gear reduction and ball screw for coarse travel, disengaging on reversal.
Stewart Platform HexapodCompliant FlexureOffset CamshaftPin Clutch CouplingBall Screw & Stepper Motor
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Brain-Score 95/100 Clickspring · 9:29

Clockmaking - How To Make A Clock In The Home Machine Shop - Part 1 - Making The Clock Frames

  1. Models the skeleton clock frames in CAD and uses a paper printout as a saw template on raw metal stock.
  2. Installs register pins between the stacked plates so they realign identically whenever separated.
  3. Drills three pillar holes, taps the bottom plate for 6mm cap screws, and deburrs inner faces to sit flush.
SolidWorks CADHegner Scroll SawRegister PinsToolmakers Clamps6mm Cap-Screw Tap
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Brain-Score 95/100 ROBRENZ · 35:12

PRECISION GROUND TOOLROOM STONES

  1. Diamond-ground flat stones glide across precision surfaces to shear off raised burrs without removing parent metal or altering geometry.
  2. Alternating spring cuts on both stone faces during surface grinding balances internal stresses, verified via the 30% hinge-point test.
  3. Ultrasonic cleaning flushes grit from pores while a sharp blade pops out embedded metal chips to preserve sub-micron deburring accuracy.
Precision ground flat stonesSurface grinderUltrasonic cleaner30% hinge flatness testSine plate & precision vise
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Brain-Score 95/100 CNC Kitchen · 11:40

Threaded Inserts for 3D Prints - Cheap VS Expensive 💰

  1. Axial pull-out tests of M3 inserts in 3D prints showed Ruthex held 181 kg and eBay inserts 157 kg, vs 39 kg for molding inserts.
  2. Screwing an M3 bolt directly into a slightly undersized printed hole held 142 kg, working well for one-time assembly.
  3. 3D-printed holes shrink during cooling, requiring compensated CAD hole diameters like 4.0 mm for Ruthex M3 heat-set inserts.
M3 heat-set brass insertsUniversal test machineSoldering ironPLA & ASA test printsCAD hole compensation
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Brain-Score 95/100 The Efficient Engineer · 29:31

Understanding GD&T

  1. GD&T controls 14 geometric characteristics so part tolerances reflect real assembly and sealing functions beyond linear dimensions.
  2. Datums restrain a part's six degrees of freedom by pairing real datum features with physical datum simulators during inspection.
  3. MMC and LMC modifiers grant bonus tolerance as feature size shifts, while Rule #1 enforces a perfect-form envelope at MMC.
GD&T (14 Characteristics)Datums & 6 Degrees of FreedomDatum Feature vs SimulatorMMC & LMC Bonus ToleranceEnvelope Principle (Rule #1)
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Brain-Score 95/100 Breaking Taps · 26:25

I made tiny robot eyes

  1. Opposing-pole magnets paired with dual counter-wound coils eliminate the zero-force dead zone of standard voice coils.
  2. Parallel coil windings had ultra-low inductance, causing 4A current spikes inside the DRV driver's 25 µs chop cycle.
  3. Rewiring coils in series stabilizes driver current and enables fast micro-movements, though linkage backlash remains.
Opposing-Pole Voice CoilDyneema Flexure SuspensionOscilloscope Current ShuntDRV PWM Current ChoppingSeries vs. Parallel Inductance
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Brain-Score 95/100 Clickspring · 23:49

The #AntikytheraMechanism Episode 6 - Making The Metonic Calendar Train

  1. The Metonic gear train models 235 lunar months across 19 solar years via a pointer tracing five turns of a 47-month spiral dial.
  2. Triangular gear teeth allow fine outer-profile filing after pivot drilling so wheel depthing extends the tooth-forming process.
  3. Wheel assemblies combine square arbors, staked pinions, press fits, taper pins, and inspected end shake for smooth rotation.
Metonic Cycle GearingTriangular Gear DepthingSquare Arbors & Taper PinsClockmaker End ShakeStaking & Press Fits
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Brain-Score 95/100 Dan Gelbart · 20:55

Unusual shop tips Part 2

  1. Dan Gelbart demonstrates detecting a single 10-micron pinhole defect among millions of 1-micron filter pores.
  2. Melted shellac rigidly bonds delicate workpieces on a lathe yet releases with heat and wipes clean with methyl alcohol.
  3. Three radial slots pointing to one common center form a kinematic mount for repeatable batch part registration.
Shellac Lathe WorkholdingThree-Slot Kinematic MountMethyl Alcohol CleanupMicron Filter Leak Testing1 mm ID Tubing Sprayer
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Brain-Score 95/100 Clickspring · 9:02

A Wedge-Style Hand Vise - Part 3 (Making the Springs & Fasteners)

  1. Dual 0.7 mm tempered blue pivot-steel compression springs sit just ahead of the jaw pivot to push the vise jaws open when unscrewed.
  2. A brass wire guide and cross-drilled arbor wind 3 active coils at a 1.5 mm lathe leadscrew pitch by turning the spindle manually.
  3. Side-by-side steel fasteners are slotted, clocked for visual alignment, trimmed, hardened, tempered, and polished for durability.
Lathe Spring WindingTempered Blue Pivot SteelBrass Wire Guide & ArborScrew Slot ClockingHardening & Tempering
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Brain-Score 95/100 Clickspring · 9:58

A Wedge-Style Hand Vise - Part 5 (Making the Jaw Ends & Final Assembly)

  1. Machining soft brass jaw caps slightly oversize leaves protective stock so final surfaces can be finished cleanly after riveting.
  2. A sine bar on a 1.25-inch gage block stack sets exact angles, while clamping split halves side by side preserves jaw symmetry.
  3. Pre-drilled brass caps act as drill templates before reaming and hammering chamfered interference-fit rivets into the steel jaws.
Sine Bar & Gage BlocksDatum Reference PlanningSlitting Saw SymmetryInterference-Fit RivetingOil Stone Surface Finishing
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Brain-Score 95/100 Chronova Engineering · 15:01

Watchmaking: Machining a Watch Gear

  1. A brass gear blank is glued to an in-situ faced lathe arbour built with a 25–80 µm adhesive gap, then micro-bored and reamed to 2 mm.
  2. Seventy-five gear teeth are cut to micrometer depth and checked via SEM before crossing out spokes to lower moment of inertia.
  3. A single-sided safe-edge barrette file deburrs spoke corners cleanly while a convex champagne cork supports the delicate toothed rim.
Watchmaker's Lathe & ArbourMicro-Boring & ReamingWheel Crossing-Out (Spokes)Safe-Edge Barrette FileMicrometer Gear Tooth Cutting
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Brain-Score 95/100 Artisan Makes · 2:30

Making A Massive Thread Tap #diy #machining

  1. Turn a 3-degree lead taper on the steel blank, then cut 40 mm square threads using a helical milling attachment for clearance.
  2. Mill chip flutes with a ball endmill to form cutting edges and cut a square drive on progressive multi-pass tap blanks.
  3. Pack-carburize the steel in charcoal and sodium carbonate, quench in oil to harden, and grind relief behind each cutting edge.
Helical Milling AttachmentProgressive Square TapsPack CarburizingOil Quench HardeningRelief Grinding
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Brain-Score 95/100 ROBRENZ · 29:18

LATHE CHUCK MAGIC TRT#5

  1. Lathe chucks flex under clamping load, so boring jaws without preloading causes tip-only grip and severe chatter.
  2. Counterboring a jaw-face groove for a bearing outer race preloads the scroll before hard-turning true jaw surfaces.
  3. Mounting the indicator base directly on the chuck body keeps the metrology loop tight and excludes machine flexure.
Lathe Chuck PreloadingHard TurningBearing Race RingTight Metrology Loop5C Adjust-Tru Fixture
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Brain-Score 95/100 The Efficient Engineer · 8:22

Understanding Fatigue Failure and S-N Curves

  1. Cyclic loads cause fatigue failure well below ultimate strength via surface crack initiation, incremental propagation, and fracture.
  2. S-N curves relate stress amplitude to cycle life and reveal a horizontal endurance limit in ferrous metals for infinite elastic life.
  3. Engineers adjust for tensile mean stress via the Goodman diagram, sum variable cycles with Miner's rule, and use LEFM for existing cracks.
S-N CurvesEndurance LimitGoodman DiagramRainflow CountingMiner's Rule
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Brain-Score 94/100 Clickspring · 7:31

A Wedge-Style Hand Vise - Part 4 (Making the Vise Jaws)

  1. Undersize drilling followed by reaming creates precise pivot holes used to align superglued blanks with a filing button.
  2. Keeping belt-sanding temperatures under 200 °C prevents heat-tint oxidation and protects template and cyanoacrylate bonds.
  3. Soaking in acetone debonds the paired jaws, while a fine oilstone removes burrs and flux strips oxide without sanding grain.
Superglue WorkholdingFiling ButtonUndersize Drill & ReamerOilstone DeburringAcetone Debonding
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Brain-Score 94/100 The Efficient Engineer · 18:48

How a Simple Mechanism Brought Down Flight 981

  1. Three pivoted bars form a rigid triangle, whereas adding a fourth bar creates a movable linkage that transforms motion.
  2. Kinematic synthesis tunes link lengths to trace coupler curves, like the 1994 six-bar Klann linkage used in walking robots.
  3. On DC-10 Flight 981, an actuator stopped short of its over-center latch, causing a cargo-door blowout and floor collapse.
Four-Bar LinkageKinematic SynthesisCoupler CurvesSix-Bar Klann LinkageOver-Center Mechanism
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Brain-Score 94/100 oxtoolco · 31:43

Precision Mechanics

  1. Parallel membrane flexures deliver smooth micro-motion, paired with flush slotted stops that block bidirectional overtravel.
  2. Adding a large-diameter knob to a standard 1/4-28 screw boosts radial leverage for smooth adjustments within 50 millionths.
  3. Differential screws combine common pitches for ~224 TPI effective resolution, trading 7x shorter travel for ultra-fine control.
Parallel membrane flexuresBidirectional overtravel stopDifferential screw (~224 TPI)Large-knob radial resolution50-millionths dial metrology
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Brain-Score 94/100 Workshop Companion · 34:10

Tapered Planters

  1. Sloped cedar planters form inverted rectangular pyramid frustums joined via traditional hopper-style compound mitered butt joints.
  2. Checking a digital angle finder on a 45°/90° square exposes progressive drift (0.0012°/deg) to compensate miter-gauge settings.
  3. Double-gluing end grain prevents starved joints, sandpaper grit in 15° U-wedges stops slip, and unglued screws allow wood movement.
Inverted Pyramid Frustum GeometryCompound Mitered Butt JointProgressive Angle-Finder CalibrationDouble-Sized End-Grain Gluing15° U-Wedge & Abrasive Clamping
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Brain-Score 94/100 Clickspring · 7:15

Clockmaking - How To Make A Clock In The Home Machine Shop - Part 2 - Machining The Clock Pillars

  1. Turns end spigots to final size first with an undercut so the three skeleton-clock pillars seat squarely on the frames.
  2. Drills, taps, and cuts generous 60-degree center holes at both ends to allow repeatable concentric remounting.
  3. Machines a hex-bar lathe center in place and drives the spigot with a custom carrier to match profiles and tapers.
Metal lathe (between centers)60° center drillSpigot undercuttingCustom lathe carrierDykem layout fluid
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Brain-Score 94/100 Joseph Willis · 1:00

Spiral Vase in Fusion 360!

  1. Sketch a 3-point spline vase profile with dual wall and rib offsets plus a 45° top chamfer, then revolve the main body.
  2. Create top and bottom center slots offset by ~30° and loft between them along a 3D sketch line to form a twisted spiral rib.
  3. Revolve-cut the hollow interior and excess rib ends, fillet the rib edges, circular-pattern the rib, and combine for printing.
Fusion 3603-point spline offsetsRevolve and revolve-cut3D sketch path loftCircular pattern
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Brain-Score 94/100 Blondihacks · 15:53

Let's Build a Model Steam Engine : Valve Gear!

  1. Machining tiny brass clevis halves directly on the bar stock simplifies workholding before hand-filing radii and parting.
  2. Drilling a rounded 0.063-inch callout caused 0.005-inch pin slop, showing 1/16-inch holes need reaming or a custom O1 pin.
  3. With the valve gear linked to the crankshaft, the model steam engine cycles its piston smoothly on 3 to 4 PSI of air.
Micro-Part WorkholdingBrass Clevis MachiningUndersize Drill & ReamingO1 Tool Steel PinSteam Engine Valve Gear
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Brain-Score 94/100 Stumpy Nubs (James Hamilton) · 2:57

How to make ANY moulding with simple bits.

  1. Any complex molding decomposes into elementary coves, beads, ogees, and flats cuttable with core-box, bullnose, and round-over bits.
  2. Slicing tall profiles into grain-matched layers lets a router reach every cut safely on wide stock before ripping strips to width.
  3. Raising a core-box bit incrementally stretches elongated coves, and gluing one layer per hour keeps the final assembly aligned.
Core-Box Router BitBullnose & Round-Over BitsLayered Profile DecompositionTable Saw RippingStaged Glue-Up
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Brain-Score 94/100 driving 4 answers · 17:00

Logic Defying V5 Engine - Honda's RC211V Explained Like Never Before

  1. Honda's MotoGP RC211V V5 engine uses five identical bores and pistons across a 3-cylinder and 2-cylinder 75.5° V-bank layout.
  2. Four outer rods share two inline crank pins at 0° offset, while a central crank pin for the fifth piston is offset by 104.5°.
  3. Timing the unpaired middle piston near peak velocity (minimal inertial force) as outer pistons hit top dead center achieves primary balance.
Honda RC211V V5 ArchitecturePrimary Engine Balance75.5° Cylinder Bank Angle104.5° Crank-Pin OffsetPiston Inertial Force Cancellation
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Brain-Score 94/100 Practical Precision · 6:33

How to Layout a Kinematic Mount Using the Maxwell Criterion

  1. A Maxwell kinematic mount pairs three balls with three v-grooves to establish six contact points that exactly constrain six DOF.
  2. Shock, vibration, and thermal expansion cause micro-disassembly where friction and deformation degrade poor mount layouts.
  3. Under the Maxwell criterion, each v-groove centerline must bisect the ball-triangle apex angle to resist rotation on all three axes.
Maxwell Criterion3-Ball 3-Vee CouplingExact 6-DOF ConstraintApex Angle Bisector LayoutInstantaneous Rotation Axes
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Brain-Score 94/100 WeberAuto · 11:38

Toyota Hybrid Transmission Operation - 15 Years on YouTube!

  1. Toyota's power-split planetary gearset links the engine crankshaft to the planet carrier, MG1 to the sun, and MG2 to the ring.
  2. MG1 spins 3.6 turns per engine turn for starting, then slows, stops at 55-65 mph, or reverses to create overdrive eCVT ratios.
  3. MG2 drives the wheels alone in EV mode with a stationary engine and acts as a generator during braking to charge the battery.
Power-Split Planetary GearsetMotor-Generator 1 & 2 (MG1/MG2)Electronic CVT (eCVT)Torque-Damping FlywheelRegenerative Braking
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Brain-Score 94/100 This Old Tony · 29:04

Gears! - But Were Afraid To Ask (MiniLathe) - BETTER AUDIO

  1. Meshing gears must share an identical metric module or diametral pitch, such as the Module 1 gears in a mini-lathe feed train.
  2. Involute tooth profiles curve more sharply at lower tooth counts, requiring gear cutters matched to the target tooth range.
  3. A spin indexer pairs a 36-hole plate (10° steps) with a 9-hole vernier scale to divide blanks in 1° increments for cutting.
Module 1 Gear CuttersSpin Indexer (5C / ER32)Dividing HeadInvolute Tooth ProfileMini-Lathe Change Gears
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Brain-Score 94/100 James Bruton · 27:02

I built a Balancing ONE-BALL Bike

  1. Builds a rider-carrying one-ball balancing bike from 4040 aluminum extrusion and three HTD 5mm belt-driven omni-wheels.
  2. Balances roll and pitch simultaneously using IMU feedback and Arduino PID loops tuned around integral error accumulation.
  3. Coats the electronics box with conductive nickel spray to shield against static glitches from the plastic ball and rollers.
Two-Axis PID ControlOmni-Wheel Ball Drive4040 Aluminum ExtrusionIMU Roll & Pitch SensingNickel Static/EMI Shielding
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Brain-Score 94/100 Slant 3D · 32:29

Ultimate Guide to Connecting 3D Printed Parts | Pins, Fins, Slots, & Snaps

  1. Replaces saggy round holes and fragile pegs with diamond cross-sections, slab-and-slot joints, and compliant S- or C-clip snaps.
  2. Adds thin flexible grip fins inside T-slots and tongue-and-groove joints to absorb FDM tolerance variation without supports.
  3. Reinforces vertical pins against layer-line shear using cruciform shapes and internal micro-voids that force extra slicer walls.
Diamond peg & holeCompliant S-snap fitsCrush-fin T-slotsInternal glue slotsMicro-void slicer walls
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Brain-Score 94/100 ASIRI Designs · 11:25

Building Science Blind Spots... Material Compatibility

  1. Building envelopes usually fail at material interfaces and transitions due to chemical incompatibility and unaccommodated movement.
  2. Direct contact between unbacked PVC membranes and polystyrene leaches plasticizers, embrittling PVC and forming corrosive HCl acid.
  3. Vapor diffusing through polyurethane roof membranes dissolves concrete salts beneath, driving osmotic water blisters that leak.
Material CompatibilityPVC Plasticizer MigrationDehydrochlorinationOsmotic Roof BlisteringSeparator & Cover Boards
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Brain-Score 93/100 Tom Stanton · 17:11

Super Capacitor Wind-Up Plane

  1. Hand-cranked supercapacitors replace slow rubber-band winding, delivering 45 seconds of powered flight from a 4-second charge.
  2. Datasheet analysis shows energy density plateaus near 10 F (~3 g), balancing storage capacity against packaging mass overhead.
  3. Stress simulations fix forward wing warping, while 3D printing frames onto tissue paper builds an airframe in under 20 minutes.
10 F SupercapacitorsHand-Crank GeneratorWing FEA Stress Simulation3D Printing on Tissue PaperEnergy Density Trade-Off
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Brain-Score 93/100 Precision Engineering, University of Twente · 5:26

Flexure Joints for Large Range of Motion

  1. Compliant flexure joints eliminate friction, backlash, and lubrication, though conventional designs lose support stiffness at large angles.
  2. Combining parallel and series flexures in a hybrid topology reroutes parasitic torsion into stiff support directions at large stroke.
  3. Fast nonlinear SPACAR multibody models and FEA optimize complex flexure geometries 3D-printed in nylon, ABS, or titanium.
Compliant Flexure HingesHybrid Parallel-Series TopologySPACAR Nonlinear ModelingTopology Shape OptimizationTitanium Additive Manufacturing
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Brain-Score 93/100 NightHawkInLight · 30:58

Homemade Machine Turns Bioplastics Into Cooling Fabric

  1. A DIY spinner feeds modified PLA through a heated hollow shaft using a variable-speed drill and 6-inch inline fan.
  2. Specially modified PLA pairs high solar reflectivity with strong infrared emissivity in the sky-cooling window.
  3. In direct sunlight, the spun fabric stays colder than white cotton and cooling paint without needing a protective film.
PLA BioplasticRadiative Sky CoolingCentrifugal Fiber SpinnerVariable-Speed Drill6-Inch Inline Fan
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Brain-Score 93/100 Teaching Tech · 20:09

Klipper guide: Input shaping, pressure advance and macros (manual + accelerometer)

  1. Klipper macros bundle multi-line G-code routines into reusable commands with custom variables.
  2. Pressure advance is calculated from tuning-tower height times the step factor while avoiding elephant's foot.
  3. Input shaping eliminates ringing via ringing-tower frequency math or an accelerometer using MZV or EI filters.
Klipper G-Code MacrosPressure Advance TuningInput Shaping (MZV & EI)Ringing Frequency FormulaAccelerometer Auto-Calibration
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Brain-Score 93/100 Applied Science · 14:58

DIY Scanning Electron Microscope - Overview

  1. A glass bell-jar vacuum chamber houses a CRT-style electron gun firing electrons down a copper column onto a metal sample.
  2. Electrostatic lenses focus the beam while orthogonal X/Y plates use up to a few hundred volts to steer raster scanning.
  3. Smaller deflection voltages scan a tinier sample area on a fixed-size synchronized oscilloscope screen, raising magnification.
Scanning electron microscopeGlass bell-jar vacuum chamberCRT filament electron gunElectrostatic deflection platesOscilloscope raster sync
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Brain-Score 93/100 Blondihacks · 26:42

Safety Valves! - Pennsylvania A3 Switcher, Part 105

  1. Coal-fired steam locomotive safety valves lift regularly in normal service to regulate boiler pressure against steady fire heat.
  2. Grinding a custom end-cutting tool with a 15-degree cutting angle and 10-degree clearance machines a precise internal valve seat.
  3. A through-hole tailstock die holder and grooving tool thread, turn, and part off the entire valve bonnet in a single lathe setup.
Lathe & Milling MachineCompound Angle Tool GrinderFeeler Gauge & Quill DROTailstock Die HolderSteam Safety Valve
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Brain-Score 93/100 DarkAero, Inc · 26:02

Testing the DarkAero 1 Engine Mount

  1. Mounting the 6-cylinder engine closer to the firewall preserves aircraft CG with a smaller tail, cutting wetted area and drag.
  2. The non-welded mount must resist thrust, torque, +3.8g/-1.52g inertial loads plus safety margin, and gyroscopic precession.
  3. A concrete mass simulator set at the exact engine-propeller CG uses hydraulics and S-type load cells to validate proof loads.
Aircraft Center of Gravity (CG)Structural Proof-Load TestingGyroscopic Precession LoadsS-Type Load CellsMass & CG Test Simulator
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Brain-Score 93/100 Practical Precision · 8:34

Modeling a Kinematic Mount in CAD (using SolidWorks)

  1. A Maxwell kinematic mount constrains all six rigid-body degrees of freedom using three balls seated in three V-grooves (six contacts).
  2. Avoiding over-constraint prevents structural distortion while extension-spring preload locks the mount without excessive deflection.
  3. Parametric SolidWorks modeling balances ball diameter (6–10 mm), groove angle (120°/135°), 0.5 mm clearances, and contact stress.
Exact Kinematic Constraint (6 DOF)Maxwell V-Groove MountSpring Preload OptimizationParametric SolidWorks CAD
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Brain-Score 93/100 Joseph Willis · 2:51

How to Reverse Engineer Threads in Fusion

  1. Measure the 18 mm outer diameter, 1.5 mm thread height per side (giving a 15 mm core), root-to-crest taper, and 5 mm pitch.
  2. Model a 15 mm cylinder in Fusion, join a 3 mm square-section Coil at -5 mm pitch, trim ends with Split Body, and chamfer flanks.
  3. Insert the modeled thread, align it with Assemble Joint, and run Combine to cut matching internal threads into the target body.
Autodesk FusionCalipers & Pitch MeasurementCoil & Split Body ToolsTwo-Distance ChamferAssemble Joint & Combine
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Brain-Score 93/100 New Mind · 30:47

Why Designing An Exhaust Systems is So Difficult

  1. Exhaust engineering evolved from muffling supersonic valve-opening pressure cracks to resolving sub-500 Hz firing-frequency noise.
  2. Walter Kaaden's 1955 two-stroke expansion chamber used reflected acoustic waves as an invisible valve to trap fresh fuel-air charge.
  3. V8 H-pipe and X-pipe crossovers couple asymmetric cylinder banks so negative pressure pulses assist exhaust scavenging during overlap.
Tuned Expansion ChamberAcoustic Wave ReflectionExhaust ScavengingH-Pipe & X-Pipe CrossoversMuffler Noise Attenuation
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Brain-Score 93/100 Paul Sellers · 10:49

How to make a Drawbore Mortice and Tenon | Paul Sellers

  1. Boring the 3/8-inch mortise hole from both faces as soon as the auger bit's snail protrudes prevents exit blowout.
  2. Marking through the seated mortise and shifting the tenon bore 1/16 inch toward the shoulder creates drawbore clamping force.
  3. Sizing a riven peg through a mild-steel plate and tapering an offset tip pulls the joint permanently tight without splitting.
Drawbore Mortise & Tenon1/16-Inch Shoulder OffsetDouble-Sided Auger BoringMild-Steel Dowel Plate
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Brain-Score 93/100 Real Engineering · 31:46

The Insane Engineering of the 787

  1. The Boeing 787 shifted aviation from hub-and-spoke jumbos to direct routes using a carbon-fiber composite airframe.
  2. High elastic strain capacity in composites enabled a slender aspect-ratio-11 wing (versus 9 on the 777), cutting vortex drag.
  3. To slash machining waste (buy-to-fly ratio) and cost, Boeing replaced titanium window frames and adopted 3D-printed titanium.
Carbon-Fiber Composite AirframeHigh Aspect Ratio Wing (AR 11)Wingtip Vortex Drag ReductionBuy-to-Fly Machining Ratio3D-Printed Titanium Parts
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Brain-Score 93/100 Joseph Willis · 2:50

Better Twist Snap Design in Fusion

  1. Model an 18-degree entry channel leading into a 15-degree twist slot with a 2 mm path offset and 0.2 mm wall clearance.
  2. Add two draft tapers so the 3 mm filleted tab slides smoothly into the channel and rides upward as the parts twist shut.
  3. Cut 6.4 mm deep flush pockets for press-fit ball plungers that snap into 2 mm detent holes to lock orientation.
Autodesk FusionBall Plunger DetentTwist-Snap JointDraft AnglesCircular Pattern
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Brain-Score 92/100 This Old Tony · 24:19

Make Your Own Air Knife!

  1. An air knife feeds compressed air into a milled plenum and releases a thin laminar sheet through a 0.002–0.003 inch shim gap.
  2. Via the Coanda effect, the high-speed air clings to one wall and entrains ambient air—reaching up to 1,000 CFM at six inches.
  3. Machining a slotted body with a tapped 1/4-inch port and a 0.003-inch paper shim builds a working shop air curtain.
Air knifeCoanda effectPlenum chamberPrecision shimCalipers
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Brain-Score 92/100 Dan Gelbart · 19:15

Building Prototypes Dan Gelbart part 2 of 18 Safety

  1. Drill-press flutes can grab unclamped sheet metal at breakthrough, spinning it like a blade unless mechanically stopped.
  2. Lathe safety demands removing chuck keys immediately, never wearing gloves near spindles, and holding emery cloth safely.
  3. Covers bench-grinder tool-rest gaps, table-saw kickback mechanics, and shatter shielding on hydraulic shop presses.
Drill-press work clampingLathe spindle disciplineGrinder tool-rest gapTable-saw kickback controlHydraulic press shielding
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Brain-Score 92/100 David Charlesworth · 16:24

Preparing the chip breaker for use

  1. A bench plane chipbreaker requires a flat front lip mating seamlessly with the blade back so shavings cannot wedge underneath.
  2. Using the 1-in-60 rule on a 120 mm cap iron, a 3 mm rear prop sets a 1.5° clearance angle exceeding the blade's 2/3° back bevel.
  3. Honing a 45° top bevel until a continuous wire edge forms, then polishing on compound-charged MDF at 50°, creates a crisp mating edge.
Chipbreaker Lip Preparation1-in-60 Angle Rule (1.5° Clearance)Ruler-Trick Back Bevel Geometry45° Bevel & Wire-Edge CheckMDF Compound Honing
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Brain-Score 92/100 Inheritance Machining · 31:34

Mill vs Lathe vs... Shaper?

  1. Machining three metal dominoes compares how a vertical mill, lathe, and Atlas 7B shaper cut slots, chamfers, and pips.
  2. On the 7-inch shaper, the elevator screw sets rough vise height while the tool-slide handwheel controls exact depth.
  3. Reducing cross-feed step-over on the connecting arm and raising speed for carbide tooling improves shaper finish.
Atlas 7B metal shaperVertical milling machineManual metal latheCarbide single-point toolCross-section drafting
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Brain-Score 92/100 CNC Kitchen · 9:54

INFILL pattern and SHELLS - How to get the maximum STRENGTH out of your 3D prints?

  1. Increasing outer shell thickness (perimeters) boosts 3D-printed part strength more effectively than raising infill density alone.
  2. Full honeycomb infill leads in strength-per-weight, yet rectilinear matches its strength closely across 15% to 75% infill.
  3. Accounting for print time makes rectilinear infill a faster, practical alternative to honeycomb in Slic3r and Cura.
Shell PerimetersHoneycomb InfillRectilinear InfillSlic3r & CuraDestructive Hook Test
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Brain-Score 92/100 driving 4 answers · 18:43

MIND BOGGLING ENGINE GEOMETRY - Rod Ratio Explained

  1. At identical bore, stroke, and RPM, short rods accelerate pistons faster from TDC down, while long rods accelerate faster from BDC up.
  2. Shorter connecting rods create steeper rod angles that push pistons harder against cylinder walls, increasing friction, heat, and wear.
  3. Longer rods cut side-loading for high-RPM engines and offset stroker crankshaft angles, requiring higher wrist pins or a taller deck.
Rod-to-Stroke RatioPiston AccelerationCylinder Wall Side-LoadingWrist Pin PlacementStroker Crankshaft
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Brain-Score 92/100 Workshop Companion · 0:57

Wood Moves

  1. Wood exchanges moisture with seasonal humidity changes, expanding and shrinking across the grain while staying stable along its length.
  2. A 12-inch (30 cm) wide board can move up to 1/4 inch (6 mm) across the grain, splitting wood or breaking glue joints if restricted.
  3. Accommodate movement by aligning grain directions, floating door panels unglued, or keeping cross-grain glue joints under 3 inches wide.
Cross-Grain Wood MovementGrain-Aligned JoineryFloating Frame-and-Panel3-Inch Cross-Grain Glue Limit
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Brain-Score 92/100 ROBRENZ · 29:45

Moore Pattern Hand Scraping

  1. Moore hand scraping uses crescent-shaped strokes for precision flatness and oil retention on machine ways.
  2. Roughing with a 1.25-inch wide, large-radius scraper at a low angle with crossed strokes prevents digging holes.
  3. Letting marking medium evaporate on the dauber before rolling leaves a thin, smudge-free film to show true high spots.
Hand scraper18-inch surface plates3-plate methodMarking medium & dauberSlow-speed face grinder
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Brain-Score 92/100 LockPickingLawyer · 10:37

[1299] Unpickable Locks From Stuff Made Here

  1. Shane's dual-core lock links two cores via a rod, offsetting the bottom core 45° so pins cannot move while tensioned.
  2. Slipping a thin metal shim between the door and housing tensions the upper core directly for standard pin-by-pin picking.
  3. Steeper reverse-raked fins, a 45° re-clocked tailpiece, and a machined back cover eliminate these mechanical bypasses.
Dual-core lock mechanismConnecting rod linkageShim tensioning toolReverse rake finsMachined backplate
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Brain-Score 92/100 Blondihacks · 19:59

Loose Ends! - Pennsylvania A3 Switcher, Part 106

  1. Machines an inverted, springless ball-check snifting valve so the steam locomotive can coast without pulling vacuum when throttled.
  2. Steam pressure seals the bearing ball upward into a brass-drifted seat, while cylinder vacuum lets gravity drop the ball open.
  3. Shears thin brass edge banding 0.025 inches narrower than a wooden insulator to hide the wood without creating a thermal bridge.
Snifting Check ValveBearing Ball Seat FormingBrass DriftSheet Metal ShearThermal Break Design
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