[Triac] Change the rotation speed of the 100v motor

Using Akizuki Denshi's 'Triac Universal Dimmer Kit'
Make a tool that changes the motor speed of a 100V power tool
The contents use a kit, and the case is made by yourself with aluminum.
Set the variable resistor for adjustment to detent volume
0:00 What is a TRIAC dimmer?
2:20 Make an aluminum case
5:33 Cut the aluminum plate
8:35 Finishing 3D printed parts
9:44 Create a detent volume
11:13 Build a triac dimmer kit
15:11 Soldering the power wire
17:47 Finish assembly and check insulation
18:53 Volume Knob Marking
20:31 Operation test