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RotoZip Revolution Switch Rewire

O

OliLt

Member
I have a RotoZip Revolution, Model: Revo1, Type 1, 120 ACV. This tool predates the sellout / takeover of RotoZip by Bosch thus no parts are available. The integrated switch and speed control on this tool no longer works. The integrated switch and speed control is part of a printed circuit board assembly. I discovered some wires that separated from the circuit board and speed control selector. The separated wires are beyond my soldering skills to repair. The motor has carbon brushes and motor windings similar to a corded drill. Can I bypass the speed control circuit board, and direct wire the switch to bring this tool back to life, although only single speed. Thanks in advance.
 
Maybe...

I bought a metabo variable speed 6" grinder at an auction with the cord cut off for $1. The fan on the motor was broken. Replaced that and got it running. The variable speed didn't work. It didn't take long for the new plastic fan to explode from motor running too fast.

Metabo did away with the variable speed module, so I had to buy a single speed module to govern the motor (and another fan). After a new cord, guard and a few other things, I was in to it for about $90. It's been good for 10 years so no complaints.

So long answer short, maybe. You can try and see. It just depends if that circuit board controls the top speed or not. I guess you aren't out anything by trying if parts to fix it aren't available.
 
Not sure what all the circuit board did. It may have converted the power to DC, then controlled the speed by varying the voltage.

But being a brush type motor, it should run on either AC or DC.

Something like this might work.
Speed Control
 
You mentioned that you have some soldering skills, if so you should be able to wire in a Step Down Converter (aka Buck Converter). Just search ebay and find one that matches your amperage requirements.

A typical voltage regulator is nothing more than a variable resistor that turns the excess voltage into heat. Meaning they are not only wasteful but also much larger.

A Step Down Converter on the other hand regulates the voltage by basically sending the power draw in pulses instead of just opening the flow completely. Likely the little board that you saw was some type of Step Down Converter, just optimized for the application.
 
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