walshie Posted June 21, 2021 Report Share Posted June 21, 2021 I was cutting something with my 115mm angle grinder the other day and it just stopped. I unplugged it, checked everything was as it should be and when I plugged it in again it worked. It seemed to work fine, but it sounded like it was revving a lot faster than before. Any idea what might cause this? Quote Link to comment Share on other sites More sharing options...
Flyboy1950 Posted June 21, 2021 Report Share Posted June 21, 2021 Sounds a bit like a fuse problem. If a moulded plug check the fuse bases are connecting firmly with the fuse cartridge. If a replacement plug check the wires are screwed firmly into the sides of the electrical pins. It could also be a broken wire in the mains cable, I have had this many times in all sorts of equipment like vacuum cleaners, irons etc More difficult to diagnose. Usually on the phase wire. Could also be worn/broken brushes if your disc cutter has them. Hope this helps FB Quote Link to comment Share on other sites More sharing options...
ditchman Posted June 21, 2021 Report Share Posted June 21, 2021 35 minutes ago, Flyboy1950 said: Sounds a bit like a fuse problem. If a moulded plug check the fuse bases are connecting firmly with the fuse cartridge. If a replacement plug check the wires are screwed firmly into the sides of the electrical pins. It could also be a broken wire in the mains cable, I have had this many times in all sorts of equipment like vacuum cleaners, irons etc More difficult to diagnose. Usually on the phase wire. Could also be worn/broken brushes if your disc cutter has them. Hope this helps FB couldnt add any more than this........... Quote Link to comment Share on other sites More sharing options...
walshie Posted June 21, 2021 Author Report Share Posted June 21, 2021 Thanks. I'll check the fuse and wires but it seems odd it's revving faster. I'll see if I can dig the instruction book out to see if it has brushes and how to check them. 👍 Quote Link to comment Share on other sites More sharing options...
ditchman Posted June 21, 2021 Report Share Posted June 21, 2021 39 minutes ago, walshie said: Thanks. I'll check the fuse and wires but it seems odd it's revving faster. I'll see if I can dig the instruction book out to see if it has brushes and how to check them. 👍 there should be 2 little plastic (black) insert screws on the body near the handle/rota.....those are the brushes if you un screw them quite honestly....if the fuse or the brushes are ok..............you might as well chuck it away and get a new one ...for the price they are............once you mend them they start the slippery slope of always wanting attention Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted June 21, 2021 Report Share Posted June 21, 2021 Could it be a thermal cut out? Were you working the grinder hard and for a long time? Quote Link to comment Share on other sites More sharing options...
walshie Posted June 21, 2021 Author Report Share Posted June 21, 2021 27 minutes ago, ditchman said: there should be 2 little plastic (black) insert screws on the body near the handle/rota.....those are the brushes if you un screw them quite honestly....if the fuse or the brushes are ok..............you might as well chuck it away and get a new one ...for the price they are............once you mend them they start the slippery slope of always wanting attention I agree. 25 minutes ago, TIGHTCHOKE said: Could it be a thermal cut out? Were you working the grinder hard and for a long time? Just cutting the top off a barrel. I'm more concerned about the speed increase really. Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted June 21, 2021 Report Share Posted June 21, 2021 Does it have a second speed setting that you have inadvertently switched over to? Quote Link to comment Share on other sites More sharing options...
walshie Posted June 21, 2021 Author Report Share Posted June 21, 2021 2 hours ago, TIGHTCHOKE said: Does it have a second speed setting that you have inadvertently switched over to? Had to go and check before answering. No. Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted June 21, 2021 Report Share Posted June 21, 2021 Were you using premium grade electricity? Quote Link to comment Share on other sites More sharing options...
walshie Posted June 21, 2021 Author Report Share Posted June 21, 2021 18 minutes ago, TIGHTCHOKE said: Were you using premium grade electricity? I did have the meter turned up to 11.... Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted June 21, 2021 Report Share Posted June 21, 2021 Love the Spinal Tap reference! Quote Link to comment Share on other sites More sharing options...
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