New Motor Help

J

Jrmysell

Joined
May 18, 2014
Messages
548
I received this for free today. I want to use it for a disc grinder. The problem is this has a 7/8s drive shaft. What is the best way to convert it to 5/8s? Have a machine shop turn it to 5/8s or is there an adapter or something? Also I'm not sure that its a TEFC, but not 100%. I tried looking it up but couldn't find this specific one. I know I'll need to take the pulley off. Thanks.
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I would not mod the motor. If anything I would have the disk opened up or find a disk that takes 7/8" shafts. It's also 3ph so your going to need a VFD to beable to run it.
 
Look at the ends of the moter, are there holes or slots that let air into the motor? If so I would use that motor for something else not related to grinding.
 
if the motor has vent holes, cover them with the furnace filter stuff you buy at hardware store. once a week or so, change the filter and vacuum the ends of the motor. the motor was free, use it till it dies.
 
I do think it is an ODP enclosure, not a TEFC. I do have a VFD though, KBAC 27 for my belt grinder. I plan on running my disc grinder off it too.
 
I had a 7/8 shaft turned to 5/8 for my "Nathan" disc because I wanted no runout.
 
If you go the machine shop approach, I'd have the disc made to fit the motor rather than the other way around.
 
I would have the shaft turned so that when you burn up the ODP motor you can get a 5/8" shaft motor to replace it and be back into standard disc range. It's "easier" to put the shaft between centers and get a concentric, tightly sized .6245" shaft than to bore a disc to .8755" nice and perp and concentric. For me anyway.

Especially if you have or are purchasing an anodized aluminum disc. Then you don't bore out the anodizing.
 
as others have mentioned, it's a 56 frame motor at 2Hp. Not much metal there for the mass a disk grinder would need. The frame seems to indicate it is suitable for "hazardous" locations/ installations, so it would fit well as a belt driven grinder motor in my opinion. (H56....)
 
the adapter I listed is $30 delivered, unless you are drinking buddies with a machine shop owner, they are going to want 2 or 3 times that amount to turn down the shaft and put in new keyway or open up a disc.
 
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