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Record lathe belt jumping

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BenS

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I need some advice on my lathe
Picked up a record dml36 that is 17 years old.
It's worked well for a few weeks, however now the belt jumps off the pulley attached to the motor.

Is this a sign I need to replace the belt or something more severe?
 

Paul Hannaby

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Does the belt look damaged or heavily worn? If so, replace it.
Are the pulleys aligned correctly? If no, the grubscrews may have worked loose - reposition the pulley and retighten the grubscrews.
Is the belt adequately tensioned? If it appears loose, adjust the motor position to tension the belt.
 

RichardG

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If Paul’s checks are all OK also check that the shafts are parallel to each other and if you have a dial gauge check for runout. Also check for play in the bearings.
 

BenS

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Thanks for the advice, I will take a look later.
The belt had some wear but I didn't think it was enough to make it jump. A new ones on order just in case
 

BenS

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Success!!
The pulleys were out of alignment, one of the bottom grub screws was loose and I suspect the pulley has moved.
All working now. Tested on a bowl blank

Thanks for the help.
 

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clogs

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those grub screws are a once a year check or use the pink Locktite/222 (treble 2) product on them.....
then they will never come loose except with an Allen wrench...
 

hog&bodge

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Thanks for the advice, I will take a look later.
The belt had some wear but I didn't think it was enough to make it jump. A new ones on order just in case
Hi Ben can you tell me where you got your new belt from..?
Mime is on the way out.
Thanks...
 

BenS

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