Turntable based on NEMA 17 (42-40)

Created a turntable to shoot some b-rolls. Based on popular NEMA 17 motor with size 42-40 and a short axle. 

• Uses 4 bearings to make platform stable under heavy objects

• Uses TPU track to roll on bearings for extremely silent operation

• Uses rotary encoder to control speed and direction

• No gears direct drive, also for silent operation

• Optionally can house 3x 5mm LEDs under the encoder knob for mode indication (is it on, charging or done charging)

Hardware used:

• NEMA 17 stepper, size 42-20, short axle, check your motor pinout

• TMC2225 driver (any TMC and some other will probably do, but check my schematics and pinout of your module)

• Rotary encoder with integrated push button

• A switch for power

• 2S Charging module with type-C connector

• Arduino board, any will do (with source code adjusting, any controller can be used instead)

• 2x 18650 batteries and a holder for them

• 4x bearings size 608 (used in skateboards, easy to find)

• 4x bolts M5x15mm to mount bearings

• 4x bolts M2.5x10mm to mount motor bracket

Battery holder is mounted with hot glue inside its mounting place, stepper is mounted with bracket and bolts. Other modules (controller, driver) jsut hot-glued at the bottom, there is plenty of space. Wires should also be kept below, to not touch the spinning top, I just used drops of hot-glue here and there.

Electrical schema attached, arduino source code can be found at:

https://github.com/poconoco/turntable

Parts with name starting with “TPU” should be printed in TPU or similar (rather hard one than soft one).

Walls and bottom/top layers I used:

• 4 walls

• 5 top and bottom layers

• 25% infill

But it may vary, just make it sturdy.

The design and assembling video (in Ukrainian, but automatic translated subs available):