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Used General cabinet saw, grinds when turning the arbor

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Forum topic by roha2236 posted 08-28-2016 10:03 PM 195 views 0 times favorited 4 replies Add to Favorites Watch
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roha2236

28 posts in 433 days


08-28-2016 10:03 PM

Topic tags/keywords: general table saw cabinet saw grinding arbor

I recently bought a used General cabinet saw, 50-260M1, and in the process of setting up/calibrating it I’ve noticed that turning the arbor with my hand results in grinding or rubbing for half a rotation. When powered up the saw sounds just fine.

I started with getting the table and extension wings dead flat, and my next step is to fine tune miter slot/blade parallelism, but the rubbing is really bugging me. Am I wrong in thinking that if it was a bad bearing the grinding would occur throughout the whole rotation of the arbor?

Has anyone had a similar situation? Or does anyone have any suggestions?

I’m going to continue with my setup, but would appreciate any feedback. Thanks.

-- Roman


4 replies so far

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MrUnix

4247 posts in 1667 days


#1 posted 08-28-2016 10:11 PM

I recently bought a used General cabinet saw

Unless you know the history of the machine and it’s maintenance… replace the bearings. Grinding is a sure sign they need it. And while you are at it, do the motor as well – if one bearing is getting toasty, the others can’t be too far behind. Cheap, easy insurance – and you will know they are good once you are done.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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daddywoofdawg

1010 posts in 1043 days


#2 posted 08-28-2016 10:11 PM

It could be just a bad spot in the bearing or filled with sawdust.and running the saw It most likely is still grinding,but you just can’t hear it.
Have you looked around the arbor to see if it’s rubbing on something,maybe even sawdust.
If all looks good I would change the bearing before you have to get a project done and you have to wait on a bearing to come.
I hear accu bearings has great customer service.

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roha2236

28 posts in 433 days


#3 posted 08-28-2016 10:21 PM

I bought the machine from a reputable business in town that I’ve dealt with many times. It came from a model making shop, so the hardest material it cut was dense foam. The saw internals look quite new.

daddywoofdawg, are you referring to accuratebearing.com? I can’t find ‘accu bearings’ online.

Edit: upon closer inspection it appears the top pulley is rubbing slightly against the underside of the table top. Only when the blade is in the highest position. The orange paint is rubbed off on a portion of the edge of the pulley. I lowered the arbor a touch, and it turns smooth as silk. I imagine that once I shift the table over slightly when I fine tune the miter slot it’ll go away.

-- Roman

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MrUnix

4247 posts in 1667 days


#4 posted 08-28-2016 10:34 PM

I bought the machine from a reputable business in town that I ve dealt with many times. It came from a model making shop, so the hardest material it cut was dense foam. The saw internals look quite new.

daddywoofdawg, are you referring to accuratebearing.com? I can t find accu bearings online.
- roha2236

Where it came from doesn’t really mean much – bearings can go bad just sitting on the shelf. And unless it’s an open race bearing, there is no way to tell if one is good or bad without pulling off the seal/shield and examining the balls and races. At that point, if it’s good, you can clean and re-pack them – but it’s usually just much easier to replace with new and be done with it. I’ve had bearings that appeared to be in perfect condition – no grinding, no run-out, no noise… only to pull them and find something like:

The above was in a 3hp Baldor motor. It ran fine and had absolutely no issues. But those bearings were on their last leg. If left in place, with use they would have soon destroyed themselves and could have also done further damage to other parts of the machine. One reason why I recommend replacing bearings on any newly purchased ‘used’ machine, even if they seem fine otherwise.

As for bearings, yes, Accurate Bearing is a great source – quality bearings and usually cheaper than anything you can find online. Ask for Lynne. Maybe read this first before ordering.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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