Dremel is good but out of my budget ..
So I built a simple mini rotary tool for
1. Pcb drilling
2. Glass etching - Lite work
3. drilling holes in PVC needs etc
Remember this tool can cause injury.
Not recommend to cut glass or metal or wood....
always safety first !!! where eye protection and gloves
Step 1: Material
- a 12v DC motor
- 104 or 0.1uf capacitor
- push button switch
- few wires
- 9v battery and holder
- Chuck for 0.7 to 1.5 mm and for 2.3 mm bits, ordered from Aliexpress
Most of the dremel bits are 2.3mm diameter on Aliexpress...
Step 2: Assembly
Connect a capacitor to both ends of the motor. And one end to battery holder and other to push button.
Connect other end of push button to remaining end of battery holder.
I tried to put 1k variable resistor. but to much current. Even an NpN transistor did not help. May be in future I will have variable speed
Step 3: Testing
Needs high torque fit cutting glass or wood.... may be for version 2