Jet mini lathe Belt replacement

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E

epson

Member
Joined
Aug 20, 2004
Messages
271
Location
Yorktown, VA, USA.
I have a jet mini without variable speed. The belt comes off the bottom pulley, but I can't get it by the top pully because the shaft comes out to the left of the lathe. I have bought a new belt from Jet, but it does not come with instructions.

Thanks,
Jack
 
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a)Remove the hand wheel and tension washer
(Loosen set screw, and thread off).
b)Then loosen the set screws in the upper pully.
c)Make sure the pully will now slide along shaft.
d)GENTLY tap shaft toward lathe bed.
e)Make sure the pully can slide off key.
The Bearing will probably come out with the shaft, but if you can get the woodruff key out from under pully, then the bearing MAY stay in.
Once you get far enough off, then the belt should be able to be slid over shaft.
f)Reverse operations to re-install, but do not overtighten the handwheel, or let it be too loose either.
g)Line up the pulleys, and retighten pully set screws

Hopefully I did not forget anything, but I think this is right

Jerry
 
If the pulley is snug on the spindle it can be a little difficult to get the pully realigned. I discussed this in my library article on changing the JET bearings; but will repeat the little trick here for the sake of simplicity.

What happens is that when you drive the spindle back into the HS, the pulley binds on the spindle and wants to move as far outboard (left as you face the HS from a normal working position) in the HS as the interior HS wall will permit. This causes the pulley to be misaligned and possibly cause it to rub on the interior HS wall.

There needs to be about 1/8" of clearance between the pulley and the HS wall for things to be right. There is a great temptation for many to stick a screwdriver in there and try to pry the pulley into the proper position. Bad thing to try.....you could damage or even crack the pulley.

Get/make yourself a little wooden spacer of the 1/8" thickness and [lace it between the pulley and the HS wall as youb are driving the spindle back into position. The spoacer will cause the pulley to stop moving 1/8" short of the HS wall sand will be perfectlt positioned. If yoyu have one, a wooden paint stirer works well and is jist about the correct thickness.

If the inboard bearing comes out when you remove the spindle, be very careful when replacing it. It is easy to damage it if you are not careful. Be sure it goes back in straight...not terribly difficult to get them cocked.....and use a wooden block to drive the bearing in if necessary as banging on one with a hammer can damage it too.

Good luck!! :smile:
 
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