190mm polisher with timer and motor speed control, TM1637 and rotary encoder.

thingiverse

2021.04.01 new version <ul> <li> <a href="https://www.aliexpress.com/item/32870155203.html">Motor replace to 24V JGB37-3650 with direction and PWM wire </a></li> <li>added acceleration and deceleration</li> <li>added direction control</li> <li>added 608 bearing mod</li> </ul><br> <a href="https://youtu.be/F9jlVXxzFq4">new 24V version video</a> <br> <br> <a href="https://youtu.be/7_eBDaP_ABU">12V version video</a> <br><br> Polisher remix for 19cm drum, flower vase.<br> I added simple timer with motor speed control, you can set time from 30m to 99h with step 30m, and PWM from 0% to 100% with step 5%.<br> You can change motor speed until counting down is active, save config: default time and pwm to mcu memory.<br><br> Most of the parts are resized with factor 19/17 from orginal design.<br><br> I bought drum here:<br> <a href="https://www.ladnaglass.com/product-pol-227-Szklany-wazon-Cylinder-H-19cm-D-19cm.html">www.ladnaglass.com</a> <br> Materials from local store in Poland:<br> <a href="https://www.korund.pl/en/">www.korund.pl/en/</a> <br> they have quite good price, silicon carbide granulation from F12 to F220 is about 2.5 EUR, F800 is 4 EUR per 1kg.<br><br> <a href="https://github.com/polihedron/TM1637-Timer-PWM">code and schematic for timer</a> <br><br> BOM for timer:<br> <ul> <li>4-Digit LED 0.56" TM1637 display</li> <li>KY-040 rotary encoder</li> <li>Arduino board: pro micro, and probably others small enough to fit inside</li> <li>IFX27001TFV50 (instead of LM1117)</li> <li>5.5mm x 2.1mm DC Female Chassis Power Socket</li> <li>24V Brushless Gear Motor JGB37-3650 24V 142RPM </li> <li>4x 608 bearings</li> <li>4x M4 20mm screws</li> <li>6x M3 5mm screws</li></ul> cap.stl, foot.stl and support_wheel.stl are Fiberlogy Fiberflex 30D, rest of elements are Rosa Transparent PET-G Premium.