Danequip 20hp grinder: hot drive??

[Andrew L]

Grinding a number of fair sized S Birch and oak stumps today.  Brand new drive belt and teeth but I (perhaps foolishly) decided that the cutter drive belts were ok and so didn't replace them.  All good until the end of the day when I noticed one had come off whilst grinding an oak stump.  On refitting it, I noticed that the grinder drive wheel had got hot, almost too hot to touch.  I supposed this might be transferred heat from the friction of constant grinding, particularly on the oak stump.  But maybe because of this stored heat on the wheel, both belts got spat off almost instantly or maybe they were just worn out?

Or are the drive wheels getting hot because the belts are getting worn and are slipping?  On my machine, if there is too much pressure on the cutters, the belts offer a screeching protest, so I try to avoid as much as possible.

Thoughts?

A

[Deafhead]

10 hours ago, Andrew L said:

Grinding a number of fair sized S Birch and oak stumps today.  Brand new drive belt and teeth but I (perhaps foolishly) decided that the cutter drive belts were ok and so didn't replace them.  All good until the end of the day when I noticed one had come off whilst grinding an oak stump.  On refitting it, I noticed that the grinder drive wheel had got hot, almost too hot to touch.  I supposed this might be transferred heat from the friction of constant grinding, particularly on the oak stump.  But maybe because of this stored heat on the wheel, both belts got spat off almost instantly or maybe they were just worn out?

Or are the drive wheels getting hot because the belts are getting worn and are slipping?  On my machine, if there is too much pressure on the cutters, the belts offer a screeching protest, so I try to avoid as much as possible.

Thoughts?

A

Similar problem on my 18" saw bench, Belts start to slip (Silently) heat up the pulleys causing the belts to slip more until the sound of the cut changes alerting you to the problem. So most probably the belts are at fault, i.e. not tight enough or past it. Or we are a bit greedy on the cut.

Edited January 18, 2022 by Deafhead
Addition to text.

[Andrew L]

Thanks.

It's an old machine (2004) and a touch temperamental but when its working, it does do a good job.

Changed cutter belts, time will tell.

Cheers

A