Motion

Things that spin and slide: pivots and hinges, bearing seats, shafts and couplings, and the ways a carriage runs straight. Each row is a parametric OpenSCAD source, and a row that sets a fit ships a coupon in three sizes — the number is a design value until one is printed.

8 of 45 rows are built. The rest are the catalogue, in order.

• M1-01Trunnion in a pocket, plus a through-pin variant

  Lets a rocker swing in a housing, and shows whether the pins can get into the pocket at all

• M1-02Interleaved knuckle on an M3 pin

  A lid, gate, or fence that swings on a pin you already own

• M1-03Print-in-place captive barrel

  A hinge that comes off the bed already pinned, for a cover you will not take apart

• M1-04Snap-head pin

  Assembles a hinge with no screw: the head passes the far knuckle and stays

• M1-05Lift-off pintle

  A gate or fence that swings and then lifts off for service

• M1-06Clevis and M3 pin

  The pin joint a linkage actually includes, instead of each linkage inventing its own

• M1-07Notch flexure pivot

  A short-travel hinge with no pin and no gap: pen compliance, a light lid, a compliant jaw

• M1-08Crossed flexure

  A small-angle pivot whose centre does not walk

• M1-09Screw-clamped friction hinge

  Holds a fence or a lid at an arbitrary angle

• M1-10Hard-stop hinge

  Parks a lid or a fence at two angles and nowhere else

• M1-11Bought cup hinge in a 35 mm bore — the European concealed hinge

  A full-overlay cabinet door that hides its hinge and can be adjusted and taken off with a screwdriver

• M2-01Printed seat for a 685 (5×11×5)

  Supports the gearbox hub on the motor side and stops the race axially

• M2-02Printed seat for a 6706 (30×37×4)

  Supports the gearbox output. Four millimetres of width is not enough to trust a press

• M2-03Printed seat for a 608 (8×22×7)

  An idler or a wheel bore. 8×22×7 is the standard designation; the bearing is bought

• M2-04Printed plain sleeve

  The bush you run when you refuse the 685, on the NEMA Ø5 or on an M3

• M2-05Flanged printed bush

  One part that takes radial load and thrust, so a hinge does not need a separate washer

• M2-06Printed thrust washer

  A flat ring between two faces that would otherwise eat each other

• M2-07Bought metal sleeve in a printed boss

  A hinge that must cycle, where PETG must not be the wearing surface

• M2-08Split pillow block

  Holds a bought bearing that cannot be pressed in from the end

• M2-09Axial spacer / end-float

  Sets how far a shaft may slide between two shoulders

• M2-10Screw-clamped race seat

  Holds a 608 or 685 without relying on a press that may creep

• M2-11Gudgeon on a stone in a head block — a cast-iron cross gudgeon whose four wings are driven into the end grain of a wooden shaft under shrunk iron bands, its neck turning in a saddle cut in a stone set into a wooden head block. ⚠ A wood row, not SOLID-SPEC: nothing is printed; the page and the numbers are the deliverable

  Carries a heavy wooden water-wheel shaft on a small iron neck, so the friction acts at 5 in instead of 21 in

• M2-12Stone spindle stepped on a bridge tree, lifted by a lighter staff (tentering) — the spindle stands in an iron step on a bridge tree that hinges on a double tenon in its post and rests, keyed, on the bray tree; the bray tree pivots on a pin and hangs from the bray iron, which hangs from the lighter staff. ⚠ A wood row, not SOLID-SPEC

  Sets the gap between running millstones from the meal floor

• M2-13Upright shaft on a footstep, held at its neck — an iron gudgeon in the foot of a wooden upright shaft, its pintle standing in a brass cup let into a stone; above, the shaft turned round where it runs in a bore through a beam sawn in halves along it and bolted. ⚠ A wood row, not SOLID-SPEC: nothing is printed; the page and the numbers are the deliverable

  Stands an upright shaft carrying the wallower and the great spur wheel on a point an inch in radius, and keeps it plumb against the meshes' side thrust

• M3-01Clamp hub on a D-flat

  Drives a hub from the NEMA shaft without a sleeve that can slide

• M3-02Cross-pin

  Locks a hub to a soft shaft with an M3 through both

• M3-03Retaining-ring groove

  Axial stop for a bought circlip or E-clip

• M3-04Printed snap retainer

  The circlip substitute: a finger behind a shoulder

• M3-05Jaw coupling

  Joins two shafts and forgives a small angular error

• M3-06Oldham coupling

  Joins two parallel shafts that are offset and must stay in phase

• M3-07Universal joint on M3 pins

  Takes power around a corner when a bevel (T1-08) is the wrong part

• M3-08Rigid clamp coupling

  Joins two round shafts, end to end, with a slit and an M3

• M3-09Round clamp hub

  Grips Ø5 when the flat does not reach the screw

• M3-10Coarse hex slider

  A shaft that changes length and still drives. This is the spline a 0.4 mm nozzle can print

• M4-01Sliding dovetail way

  A fence or a carriage that slides and does not lift off

• M4-02V-wheel and eccentric

  The drawing robot's X carriage: wheels bite a V-rail, an eccentric sets the bite

• M4-03Tongue slide with a flexure stop

  A drawer that travels, stops, and can still be pulled free

• M4-04Two-stage telescoping slide

  Full extension: the drawer comes out as far as it is deep

• M4-05Telescoping tube

  One tube inside another, with a hard stop so it cannot pull apart

• M4-06Clamp collar

  Stops a shaft sliding through a plate. Filed here because the skeleton put it in M4

• M4-07Gib wedge

  Takes up a worn or loose dovetail without reprinting the way

• M4-08Paired bushes on a smooth rod

  A short slide on one straight rod, the two bores printed in one piece so they are coaxial

• M4-09T-nut in a slot

  Locks a moving fence anywhere along a rail, then lets it go

• M4-10Screw jack on a captured nut

  Fine-adjusts that fence. One turn is a known travel

• M4-11Bought side-mount full-extension slide in a wood drawer box

  A drawer that comes all the way out under load, on a slide you buy and screw on