Help with B-Series V-Belts

cobbonthecorn · Jun 13, 2020

I have a knee mill that uses step pulleys to change spindle speeds. (Basement ceiling is too low for a "real" milling machine.) The original belts started to crack so they needed to be replaced. The original belts were made by SquareKnot or something like that, are Series B V-belts, and were very rigid in tension. The only belts I could locate locally were Gates. The issue is the Gates belts seem to be too "soft". That is they tend to stretch under load and this results in chatter that I didn't have before the belt change. Any suggestions for replacement belts? Thanks in advance!

dana gear · Jun 19, 2020

We have a couple of 30 horse power boring machines, the drives use 3 B series belts, we use Gates and yes they tend to stretch slightly when first installed after intimal stretch and re-adjustment there good to go the distance. If your belts are new leave them under load to take out the stretch. B series belts ride/grip on both sides of your pulleys they should never ride in the bottom of the pulley. Make sure that your pulleys are in good condition and not worn.

cobbonthecorn · Jun 20, 2020

dana gear- Thank you! Pulleys are in great shape. Belts are new so I'll follow your advice and let them "sweeten" a bit before any more problem solving.

atomarc · Jun 20, 2020

Wow...a 'B' section belt is quite substantial, your mill must be a monster.

Stuart

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Help with B-Series V-Belts

cobbonthecorn

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