Motor pulley for Jet 10" bandsaw - Woodworking Talk - Woodworkers Forum
 
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post #1 of 16 Old 01-22-2017, 06:31 PM Thread Starter
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Motor pulley for Jet 10" bandsaw

Hi everyone,

I'm currently upgrading the motor in my Jet JWBS-10OS bandsaw and needed your help finding a motor pulley. In a nutshell, the old motor had a 48C frame and the new one is a 56C, so the shaft diameter is larger (5/8" vs. 1/2"). I went with a 56C frame because it was just too difficult and expensive to find a decent motor in size 48, whereas size 56 motors are a dime a dozen. Unfortunately, because the shaft diameter on the new motor is larger than the old one, the hole in the motor pulley is now too small as well; I tried to enlarge the hole and key slot but it's just enough off-center to make it wobble. For reference, here is the 4-groove motor pulley that fits the 1/2" shaft: http://www.ereplacementparts.com/mot...-p-941197.html

I've been searching in vain for the same type of pulley that would fit a 5/8" shaft but to no avail. Does anyone have advice where I could find one?

Many thanks.
~David
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post #2 of 16 Old 01-22-2017, 06:54 PM
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That looks propitiatory. It wouldn't surprise me if you didn't have to have a machine shop modify the pulley you have to fit the 5/8" shaft.


Just for the sake of argument, what is the diameter of the pulley and the space between the grooves. On a long shot I'm wondering if a motor pulley from an air compressor would work. I have one that is 1 11/16" in diameter with the grooves 3/32" center to center.

Last edited by Steve Neul; 01-22-2017 at 08:29 PM.
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post #3 of 16 Old 01-22-2017, 08:04 PM
where's my table saw?
 
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Let's hope it's not destroyed.....

If the hole is not centered, you'll need a metal lathe to true it up. Lot's of folks have them, myself included. If the worst has happened and it is destroyed/enlarged beyond repair or off center, they are only $10.00 to get another. A good drill press could also be used, but a metal lathe is the best machine. Drilling a precise 5/8" hole is not the easiest as the dimensions sometimes are not precise after the hole is drilled.

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #4 of 16 Old 01-22-2017, 08:38 PM
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Several 4 groove 5/8" shaft pulleys on EBAY...
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post #5 of 16 Old 01-22-2017, 08:44 PM
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Can you remove the other pulley and replace both with common V-pulleys that give same speed ratio?

Wise men speak because they have something to say; fools because they have to say something -Plato

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post #6 of 16 Old 01-22-2017, 09:06 PM Thread Starter
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Shoot, can you please help steer me in the right direction for those 4 groove 5/8" shaft pulleys on EBAY? I've been looking for an absolute age but can't find anything even somewhat similar to my current one...
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post #7 of 16 Old 01-22-2017, 09:10 PM Thread Starter
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FrankC, I was wondering the same thing but wasn't sure. I've attached a couple of pictures of the other pulley which is attached to the lower wheel - if you have ideas on whether I could replace them with something else, I'm all ears.

For reference, the manual for the bandsaw (including all the parts) is here: http://www.mikestools.com/download/J...707200_man.pdf
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post #8 of 16 Old 01-22-2017, 09:18 PM
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My opinion... not gonna work

That pulley has a mounting flange and is meant to be attached to the wheel, unlike ordinary V belt pulleys. Just get a 5/8" bore multi groove from Ebay as shoot summ suggested or machine the one you have.
I would leave well enough alone on the wheel pulley. The other reason is you want to maintain the flat belt for performance and the small diameter over which it must travel. An ordinary V belt won't like that small of a diameter pulley.

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)
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post #9 of 16 Old 01-22-2017, 09:21 PM
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Looks like simplest solution would be to find a replacement 4 groove pulley for the motor, if you have an industrial supply house near you take the old pulley and get them to match it up with what you need.

Wise men speak because they have something to say; fools because they have to say something -Plato

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post #10 of 16 Old 01-22-2017, 09:36 PM Thread Starter
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FrankC and woodnthings, I'll give it a go and see what i can find in my local area. In your expert opinions, any thoughts on how much it will approximately cost to get a replacement 4 groove pulley with a 5/8" bore at an industrial supply house? Would it be more or less expensive than having a machine shop bore out a 5/8" hole on my existing pulley?
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post #11 of 16 Old 01-22-2017, 09:48 PM
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If I had your pulley in my shop ...

I would charge about $25.00, maybe less to drill or bore it to 5/8". If there is a keyway, that would be more OR you can file your own keyway as I have done a few times.

A boring bar setup is very easy and you can make a go/no/go gauge from a piece of 5/8" stock. Bring it in in person and establish a relationship face to face with the machinist/owner and you may be surprised... they may do it for free

A source for them here:
https://www.torquetrans.com/multi-v-pulleys

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 01-22-2017 at 09:59 PM.
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post #12 of 16 Old 01-22-2017, 10:54 PM
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Quote:
Originally Posted by dducic View Post
Shoot, can you please help steer me in the right direction for those 4 groove 5/8" shaft pulleys on EBAY? I've been looking for an absolute age but can't find anything even somewhat similar to my current one...
Sorry, reading comprehension issue on my part, I took "4 groove" to mean a typical step pulley(v-belt), not a flat or serpentine belt.

I would say woodnthings has the right approach, have a reputable machinist bore it for you, and file the key way.
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post #13 of 16 Old 01-22-2017, 11:03 PM
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I sure would hate to cut a key slot with a file. A machinist would have a milling machine which they could cut the keyway as easily as enlarging the hole.
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post #14 of 16 Old 01-22-2017, 11:49 PM
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Quote:
Originally Posted by dducic View Post
FrankC and woodnthings, I'll give it a go and see what i can find in my local area. In your expert opinions, any thoughts on how much it will approximately cost to get a replacement 4 groove pulley with a 5/8" bore at an industrial supply house? Would it be more or less expensive than having a machine shop bore out a 5/8" hole on my existing pulley?
I would get on the phone and make a few calls, if there is a number on the belt it would help clarify what you are looking for pulley wise, you could also call a machine shop and get a cost to have your pulley bored and broached. Costs will vary, both for the pulley and the machine work.

Wise men speak because they have something to say; fools because they have to say something -Plato

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post #15 of 16 Old 01-23-2017, 02:46 AM Thread Starter
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Thank you to everyone for your advice and recommendations. I will take your advice and call a local shop to see what they can do for me. When I have a solution, I'll circle back and let you know what transpired. Thanks again.
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post #16 of 16 Old 02-15-2017, 10:33 AM Thread Starter
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Hi everyone,

Wanted to give you a follow-up... I was able to find a local machine shop that was willing to redrill the hole. Paid $20 and they even cut the keyway for free. Put it on the motor and it is beautifully dead-centered - couldn't be happier with the outcome. Thanks again to all of you for your knowledge and advice!
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