I am communicating with a member whose Delta sander's cogged belt is slipping on its nylon gears. I have 1 of these sanders,but since I have mostly used it for sanding guitar tops and backs,and maybe a table,I haven't had it slip yet.
Apparently the nylon gears(timing belt pulleys) get worn and slip.
I am sure that these gears are a standard part that some company like Boston Gear stocks. Therefore,I am going to try and identify these gears,and find them in metal if I can. I will keep you posted of any progress.
I am not affiliated with Delta in any way. Just trying to help all of us owners.
P.S. McMaster Carr sells these timing belt pulleys. I am waiting on the guy to give me the specs on his timing belt pulleys,and I'll try to find them in metal. I have had too much neck and back surgery to look up under my machine,or tip it over by myself.