Replies

1. 
   _mj_ | Dec 14, 2020 02:01pm | #1

   First, if there is a keyway and no keystock inside you need one and problem solved.

   If there is no keyway, take the pulley off and make sure that when you tighten the setscrew it is protruding to the inside of the hub. If it was running loose and slipping sometimes it could have rubbed the hole closed...especially if it is an aluminum pulley.

   If the hole is closed up get a tap of the proper size and open it up again. I would also replace the setscrew to make sure it is not also worn and prone to slipping.

2. 
   esch5995 | Dec 14, 2020 02:03pm | #2

   Problems like this can be difficult to solve in a forum such as this, unless someone has experienced and solved the same issue, but we can offer suggestions to look into.

   You say the set screw is as tight as you can make it, is this true after the wheel falls off? If the set screw is vibrating loose some blue locktite should do the trick.

   If the sets crew is still tight. Is it long enough to properly contact the shaft?

   Is there a key? If not and there is a keyway you need to find an appropriate replacement.

   If there is no keyway, is there a specific spot in the shaft for the sets crew to tighten into, usually just a small dimple in the shaft? If so make sure you are tightening the set screw into this location.

   If none of these provide the solution, we'll I'm afraid I've got nothing left to offer.

1. 
   pfaber | Dec 15, 2020 04:44pm | #3

   Thanks for the quick replies. The Keyway is clear - I checked. But you may have a point about the set screw. that would be a cheap and easy replacement. Also I'm not sure if the set screw was loose when the pulley came loose, another reason to try a replacement. Maybe replace the key too. Thanks

3. 
   [email protected] | Dec 15, 2020 10:04pm | #4

   The pulley may not be the problem or the only problem First, if it's an aluminum pulley and has been coming off the shaft it is very likely worn to the point where no matter how much you tighten the set screw it's not going to hold. Your bigger problem may be if the shaft is worn. To check that out.you should get a new pulley, not aluminum, cast iron. If a brand new pulley is wobbly at all on the shaft then the shaft is worn and will never hold a pulley solidly. Many times a shaft will be worn near the end but still retain its full original dimension further in again this will result in a wobbly pulley if you can't push it past the worn area

4. 
   pfaber | Dec 16, 2020 05:21pm | #5

   All good ideas user-503580. most of the parts are no longer available but I would imagine I could find a generic pulley replacement. If I find the shaft to be the problem I guess a new saw would be the answer. It's too cold to check in my unheated garage now but I'll look for the things you mentioned in a day or two.

5. 
   rob_ss | Dec 17, 2020 02:07am | #6

   It is also possible that the pulley is changing size due to warming up in use. Friction will heat it some.
   Modern replacement pulleys often have the ability to fit multiple shafts with differing inserts so a change of pulley looks to be the option. The size only needs to be similar, not identical. It's a bandsaw, not a lathe.