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608/624 Bearing Slider-Crank Connecting Rod
This connecting rod runs on bearings at both ends. It has 80 mm between centres, a press-fit 608 big end (22.05 mm pocket) for an 8 mm crank pin and a press-fit 624 small end (13.05 mm pocket) for a 4 mm wrist pin. It turns a crank or wiper motor into back-and-forth motion for pumps, shakers, feeders and pushers. Each bearing seats on a 1.5–3.5 mm floor lip that touches only the outer race, and the U-channel beam prints flat so the push-pull load runs along the layers.
8 mm Shaft Cycloidal-Rise Plate Cam
This is a plate cam (rise-and-fall disc) for an 8 mm shaft or rod. Over each turn it lifts a 624 roller follower (13 mm OD) by 20 mm and lowers it again, using a cycloidal motion profile so the follower starts and stops without jerk. The profile is offset for the roller's 6.5 mm radius, so the follower moves exactly 26 to 46 mm from the shaft axis. The disc is 8 mm thick and the hub is 22 mm in diameter. An 8.3 mm slip-fit bore and a radial M3 heat-set insert pocket (4.0 mm) for a set screw lock it to the shaft, which suits automata, pumps, stamping rigs and indexing demos.
Quick-Return Slotted Rocker Lever
A 159 mm Whitworth-style quick-return rocker lever. One end has a 22.05 mm press-fit pocket for a 608 bearing as the pivot. The 13.4 mm wide, 80 mm long through-slot is sized for a 624 bearing (13 mm OD) on the crank pin to roll in. An M4 clearance eye at the far end connects to the output link. It turns a motor crank into a slow working stroke and a fast return stroke for shapers, wipers, kinetic sculptures and automata.
624 Roller Thrust Fork
A bolt-down fork that holds one 624 bearing (4 x 13 x 5 mm) on a radial M4x25 axle. It is part of the 'MG996R Heavy Pan-Tilt Camera Gimbal' kit, which uses three of them. The foot is 36 x 22 x 4 mm and fixes to the base deck's M3 heat-sets through two 3.4 mm holes 20 mm apart. The roller top sits 14 mm above the deck, and M3 washers under the foot raise it to 17 mm. The rollers carry the pan platter's weight, so the MG996R's spline doesn't have to.
Module 1.5 Winch Worm
This is the self-locking worm for the 'N20 Self-Locking Worm-Drive Winch' kit. It is a single-start, right-hand, module 1.5 worm: 15 mm OD, 12 mm pitch diameter, 4.712 mm lead and a 7.1° lead angle. It has a 16 x 10 mm collar with a 3.1 mm bore, 10 mm deep, for the N20 3 mm D-shaft, which an M3x8 grub screw and captured M3 nut hold. Its 4 mm tail pin runs in a 624 bearing (4 x 13 x 5 mm). The overall length is 39 mm, and it prints standing on the collar face.
Scotch-Yoke Wing Slider
This slider is part of the 'SG90 Scotch-Yoke Flapping Wing Rig' kit. It is a 56 x 26 x 10 mm block with a 40 x 13.5 mm round-ended through-slot. The crank's 624 bearing (4 x 13 x 5 mm) rolls in the slot and turns servo rotation into a ±13.5 mm vertical stroke. A 32 mm wide top tab holds two M3 heat-set inserts (4.0 mm bores, 8 mm deep) 20 mm apart, where the wing drive links bolt on. The 4 mm edge bands on both sides are left flat to slide between the frame pads and the retainer strips.
Servo Horn Scotch Crank
This is the crank for the 'SG90 Scotch-Yoke Flapping Wing Rig' kit. It's a 36 x 16 x 6 mm stadium bar with a sunken seat on the back for a single-arm SG90 horn: a 7.5 mm channel plus a 10 mm centre recess. A 6 mm centre hole gives screwdriver access to the horn screw. At the other end, 12 mm from the axis, a 9 mm boss carries a 624 bearing (4 x 13 x 5) on an M4x20 bolt, which sits in a 4.5 mm clearance bore with a captive M4 nut pocket on the back.
5 mm Shaft Groove Cam For 624 Roller
A positive-drive face cam for a 5 mm motor shaft such as a NEMA 17. Its closed 13.6 mm groove holds a 624 bearing (13 mm OD) as the roller and drives it both ways, so the follower needs no return spring. Each turn gives a 15 mm cycloidal rise over 120°, a 60° dwell, a 120° return and a 60° dwell. The cam is about 92 × 107 mm, and an M3 set screw with a captured nut locks the hub to the shaft.
624 Roller Cam Follower Slide
A print-in-place linear cam follower: a 13 x 13.5 mm plunger rides with 0.5 mm clearance through a guide housing that bolts down with four M3 screws. The plunger's head takes a 624 bearing (4 x 13 x 5 mm) as a roller on an M4 bolt with a captive nut, and it has 14 mm of stroke. Band posts on the housing and plunger let a rubber band pull the roller against your cam.
624 Bearing Servo Saver Bellcrank
A compliant steering bellcrank for RC trucks and robot linkages: the hub presses onto a 624 bearing (4 x 13 x 5 mm) and drives two 36 mm output arms through a pair of spiral leaf flexures, so curb strikes deflect the arms ~10° and spring back instead of stripping the servo. 83 x 83 x 7.5 mm, M3 clearance holes at both tie-rod arms and two link positions on the input arm, with the arm sides hitting the ring ends as built-in over-travel stops.