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Record BS350 - drive belt problem

G

Glynne

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I'm just wondering as to whether anyone has come across this problem and any suggestions as to a fix?
A couple of months ago the drive belt went on my bandsaw. I bought a replacement (can't remember where from), fitted it and it was fine for a while.
Now if haven't used the bandsaw for a while, as soon as I switch it on the belt comes off, doesn't break just slides off. If I then re-fit it, everything works fine for the day but when I come back the next day the same thing happens.
My initial thought was that the belt was stretching but having had this happen innumerable times and putting as much tension on it as possible, it keeps happening.
Whilst it doesn't take that long to fix, it is a pain in the proverbial especially if you are in the middle of something.
I have ordered another belt (from Yandles this time at double the price) but wondered if I'm missing something?
Cheers.
 
What kind of belt is it? If the pulleys aren’t exactly parallel and in-line with each other, certain belts can throw off the pulleys. It’s less likely to happen with V-belts but it can happen with flat and Poly-V, and with those types of belt you need to check that they’ve been joined correctly and they’re not skewed at the joint.
 
In addition to what Dan suggests, try spraying the belt with a belt anti-slip spray. I needed to do that fairly regularly on my old machine.
 
Looks like it is a poly vee belt - only about 3 ribs though. So my money is on the pulleys being out of line. Both pulley grooves and axes must be coplanar.
When you get the new belt note down the number possibly with be
a letter (for the rib profile)
3 for the number of ribs and
another number related to the length in mm or 1/10 inches.
eg 900-J3 or J3-900 (900 mm metric) or J3-360 for 36" imperial

Write that on the machine and next time you should be able buy a generic belt much cheaper than the OEM spare.
99% of the time machine designers use standard belts for cheapness in production and then sell for rip off rates as OEM spares (same goes for bearings too).

Bob

Needing to supply "belt jam" or similar is often indicative of a problem that at least needs understanding and ideally fixing.
 
Thank you for the replies.
Typically it seems to have sorted itself out, at least for the moment!
 
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