Mini Lathe belt slipping

[SmithDoor]

Poly V-Belts are not very expensive. If they fit the sheaves properly and the sheaves are aligned, they should grip pretty well. Even if a bit loose. It may be that they are now glazed and don't grip well. Perhaps you should go to the auto parts store and buy some belt dressing. I used it on standard V-belts for years and it helped quite a bit. Just don't overdo the amount you use.

I stop taking a greedy cuts helps.
I need to buy belt dressing too.
I did receive yesterday a new 6 Grove belt for more grip.

Thank you
Dave