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+-- Thread: convert 5/8 to 7/8 ok? (/showthread.php?tid=7378305)
convert 5/8 to 7/8 ok? - DogwoodTales - 04-10-2025
I know there are sleeve adaptors to convert a 5/8" motor shaft to 7/8", but are there any long term concerns with doing this?
I'm shopping for a 1.5hp motor, single phase 230v, with a 7/8" shaft to drive an old Craftsman planer and some used models I come across have all the right specs but with a 5/8" shaft.
The fan blade on the old motor I have is shot and it can't be replaced. If I were to find a replacement I'd have to get it professionally serviced because this motor is balanced. The cost of the service will probably run close to just replacing the motor.
RE: convert 5/8 to 7/8 ok? - lkomroff - 04-10-2025
You could also replace the pulley same diameter with 5/8 bore
RE: convert 5/8 to 7/8 ok? - Bob Vaughan - 04-10-2025
Sleeves sometimes work and other times they don't. The biggest problem I've seen is that the pulley gets slightly out of round and thus a little out of balance.
Smaller motors such as 56 frame motors will have smaller bearings such as the 6203 size where a 7/8" shaft motor will have a 6205 bearing at the shaft end.
That size bearing will take more of a load for sure.
RE: convert 5/8 to 7/8 ok? - DogwoodTales - 04-11-2025
(04-10-2025, 09:44 PM)Bob Vaughan Wrote: Sleeves sometimes work and other times they don't. The biggest problem I've seen is that the pulley gets slightly out of round and thus a little out of balance.
Smaller motors such as 56 frame motors will have smaller bearings such as the 6203 size where a 7/8" shaft motor will have a 6205 bearing at the shaft end.
That size bearing will take more of a load for sure.
Yeah, that's kinda what I was wondering. If the sleeve could cause issues and I was wondering about the motor durability overall and didn't think about the bearings specifically. I suppose that since this is for a planer I probably should stick with a 7/8" shaft since it will have larger, therefore more rugged, bearings - as well as a more durable shaft.
thanks