Wet belt sander surface speed

On every make wet belt sander I have seen, with the exception of Covington( I have never seen a large beltsander of theirs), the bearings are the biggest problem. Fix the bearings first, then give it a try, I can't imagine if run correctly that it would crack glass.

Thanks Java I was wondering about that. The bearings to put it politely are f***ked at least on the lower drive spindle. I expect to have to machine a new drive spindle from the evidence so far. Essemce said the surface speed was OK so the problem may be due to the bearings. I'll do some more digging over the weekend re surface speed. Regarding size this linisher stands about 1.8m high (6 ft) and is probably 2.2kw (3hp) or

As you are in the UK, I have no knowledge of the machines there, but why would they be any different or run by people that are any different. Usually someone "reefs" (over tightens) the belt because they think that big sucker is going to go somewhere, and that puts too much tension on the outer edge of the bearings to make them wear crooked. Usually parts are inter changeable, unless you have a machine shop and it is easier to make a spindle than buy one.

I can't imagine a wet belt of almost any grit cracking glass at anything short of warp speed? I'm wondering if it's not getting wet at all? Sometimes it may spit lots of water, but it's not actually getting the belt wet.

The speed shouldn't matter if there is enough water flooding the area. I have a diamond wheel that is modified and runs at about 2500 rpm. No matter the speed if it runs to dry it will heat up. I think a lot of times people cut back on the water because it tends to spray all over. Also, the guy may have been trying to hog out to much at a time. The Silicon carbide belts will "dull" pretty quick. You may suggest to him to consider a diamond belt. If you treat em right they'll last a long time,, and worth the extra $.

Randy Hansen SC Glass Tech. San Diego, CA.