Chicago Pneumatic CP9104Q Compact Grinder Review

This unit was purchased to replace a similar product offered by Dotco. Dotco costs over $200. We use it all day in the workshop to deburr steel linear bearings. So far it has been running for about two weeks with no problems. People in the store who use it like it better than the more expensive Dotco device.

Speed control no longer works because it is misaligned. I've tried tightening the set screw but that doesn't seem to help. Pretty good smooths and a good grinder for general work. They really need to fix the on/off cruise control. I'm now looking for a better coffee grinder as sometimes I have to shut off the air to turn it off. I'd prefer the HF one that looks just as good as this one.

I have written to the manufacturer: My wife uses this tool to cut holes in eggshells which she makes into Christmas ornaments. Everything worked perfectly last fall. She oiled it up and put it away until this week. The collet rotates easily by hand, there is no air leakage, but when you try to turn on the air, it blows out the exhaust holes on the back of the hose plug (#6 on the index) and the collet does not rotate at all. I disassembled the tool and found that it was well lubricated and not…