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Portercable 505 type 2 half sheet sander issues5/28
I bought a 505 on ebay that appears to be in pretty good condition. I just used itcon a job i just did ans when I stained it, i noticed a lot of the same type of swirl marks that are typical of a random orbital. A guy i work suggests the bearings are going.
Would you agree or disagree and why?
I also noticed there are a few bearings on the schematic , so if this is the issue, are there specific ones that cause this or do i need to replace all?
That sander is an orbital sander - it produces circular or orbital scratches. It - and others like it - are the predecessors to the random orbitals common today. A motor shaft spins in an eccentric bearing, moving the pad in a circular motion. This is easily seen if you look closely.
Yes, it will make circular scratches since that is the motion it has engineered into it. New bearings will not eliminate it.
Grit size, and how you move the sander along the wood - travel speed - will minimize the cross grain scratches. Only hand sanding, with the grain, will eliminate it. Random orbitals, for some reason, can/will still make circular scratches, but it is easier to avoid them.