I create simple gearbox with ratio 1:32 for slow down a movement for 28BYJ stepper motor,
5V DC. This motor can be use a battery so is optimal for outdoor devices, as my turntable camera system, or a camera slider.
- 2x M3 bolts, length 35 mm for gears axes, conical head
- 3x M3 bolts, length 16 mm for top of the case
- 6x M3 nuts, 1 pc for output gear(red), 5 pcs for a bottom case
- 1x M5 bolt, length 75 mm (Grinding with a flat pile to 4.8mm, then wet polish to 4.78 mm with toothpaste + sandpaper 240 grade, finish with cloth) I use a drill machine as turning lathe and after 20 minutes I have almost perfect shaft.
Gearbox can be completely mounted without needs a stepper motor. Motor can be mounted after then. So you have 2 pieces, a gearbox & a motor.
Gears & motor-gear I printed with 100% infill for a highest strength, but printing speed is recommended lower then 60 mm/s.
Recommended is 100% infill for a highest strength, for a case, but you can use line pattern with infill 50%, printing speed at 80 mm/s or lower.
Do not need any supports.
Printing time was 2 hours & 30 minutes for all components, depending on your printing speed.
Optional but not needs: For a precision diameters, I use a drill bit 3mm for gears & holes, 5mm for output shaft, 13mm for ball bearing are not needed.
I use 2 x ball bearing for output shaft. Its made from bolt M5 length 75mm, thread on 20 mm. Then I use a drilling-machine and a pile for a diameter passing to the bearings. At least I cut it and use only piece without a thread. But the thread I use it as handle in process of grinding. Time approx. to do was 30 min. with cutting & grinding.