Motor Question

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kapina001

Joined
May 21, 2006
Messages
15
I looked in the forum but did not see the difference in motor frame discussed. I found a motor but it is 145T frame instead of 56 frame. does anyone know what the difference means for a grinder motor?
 
For a grinder motor, HP and insulations (TEFC vs ODP etc) is what matters.
Assuming you're building your own grinder, you can always adjust for different dimension (OD of shaft on 145 is 7/8 vs 5/8, shaft is a bit longer,
so if the overall size). If you're adopting 145T motor to a device that was
designed for 56, be prepared to do some work. Re-boring of the pulley,
may be adjusting for base-mount hole pattern are some of things that
come to mind
 
You can buy adapter plates from 56 to 145 from motor shops, if you are bolting to a metal plate, etc.
Many ways to do it, including just drilling mounting holes in the bigger pattern.

If the shaft is bigger, and you don't have a lathe, take the pulley(s) to a machine shop and have them open the arbor up. The last thing you need is out of round or wobbly pulleys.

Edited to add: The 145T frame usually means a bigger motor with higher horspower, larger shaft, etc.

I can't remember where the break is from 56 to 145. I think when you jump from 1.5 to 2HP. It could be 2-3.
You can find higher horspower with smaller frame sizes for special applications, like compressors and the like.
You can, like I said above, buy an adapter mount to bolt on the bigger motor to allow it's use in existing mounting holes.
 
For a point of clarity, TEFC is the enclosure type and has no bearing on size or mounting. It stands for Totally Enclosed Fan Cooled and is what you want for a grinder motor. TENV (Totally Enclosed Non Ventilated) motors work well for our application as well. You don't want an open frame motor in a metal grinding environment.

Here's some info on Leeson's site that explains a lot:

http://www.iprocessmart.com/leeson/leeson_mechanical_reference.htm

If you start with that link and poke around a little, you'll find that nearly anything you need to know about motors is available on Leeson's website.
 
Thanks for the information and pointing me in the right direction. I am building a grinder so I will not have to worry about existing mounting holes, etc. It will make a difference in the pulleys, though, as the shaft appears to be 7/8. I had planned to get a matched set from Rob at Beaumont Metalworks, but the site only shows 5/8 and 3/4. I will have to look for some with a 7/8 bore.

I was wrong about the availablity of the 7/8 bore for the step pulley at Beaumont. Rob does have them. I did not remember seeing them. Anyway that will make it simple to solve that problem.

I appreciate all the replys.
 
Keep this in mind, if you're building from scratch and you use a standard frame like a Type 56, it will be easier to fit a new motor if yours fails or you need more horsepower.
 
What design are u after ? What do you put onto the motor shaft: a belt pulley to control speed or a 2" flat to drive the belt directly.

If it is a V-belt pulley, check out mcmaster.com for pulleys in all imaginable sizes.
 
I am going to put a pulley on the motor shaft and a pulley on the shaft for the drive wheel. I got the 145T motor. It is a 2 HP Leeson TEFC so should work well. I got some 1/2 inch steel plate to make the grinder frame with and a 2 inch tube with a 1 and 3/4 solid square to go in it. It is not as tight a fit as I would like so I may try something to make it fit better. I am going to pattern it after the KMG grinder from Beaumont Metal Works. I was planning to run it on 115 volts, but after reading some posts on the forum, I may try to find a way to get 220 out to the shop. The motor will run at 115, 208 or 230. I guess it would pull less amps at 230. I could make an extension cord to run out there. It is about 20-30 yards from the house.
 
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