Sander Belts break

Dampness will deteriorate the glue. Perhaps where you are storing the spares, they become damp at times.

How long have you had the belts and where were they stored?

Also, the older belt seams were directional. Suppose you took that into account as well.

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Chances are they are old or have not been stored in a cool, dry area. I have an old refrigerator in my garage that I keep my belts and masking tape in. I have masking tape in it that is about 4 years old and works like it was just bought.

You did not mention the brand of sander belts which can make a big difference. The thing that comes to mind is the 10 seconds after use. It could very well be the tension is too high. Give it just enough tension such that belt does not slip.

They are 4 years old, but others seem not to have any problem. Always dry and mostly cool, temp does rise to 90 in the summer but probably not that hot in the drawer.

Possibly Sears, possibly not. Don't remember where I bought them, but believe they were the polyester cloth one. However, the breaks are always at the glue seam. The parts diagram, indicates a spring but no tension adjustment. I have always thought the tension was high, but what do I know. I'm going to try it with a new belt and if the belt breaks, I'm going to take it apart and modify the spring than tensions the idler pulley.

Newer ones have an end-to-end rather than overlap.

FWIW, the other day I had occasion to get out the belt sander, which I haven't used in a long while. Belt broke. Next belt broke. Every belt I had broke. All of them stored in a dry basement for several years. Went down to Sears (closest place to get such things) the next morning and picked up some new belts. They didn't break.

Don't know if was the humidity or if the glue just isn't very good. I've had a similar experience with velcro-backed sanding pads--if they've been stored too long the velcro layer peels off after a few minutes of use.

I have had bad luck with Harbor Fright, they seem to break before the grit is gone but the Nortons I get from the BORG seem pretty good. I have some blue Nortons that are almost slick but they are still together. I agree age could be the problem. I'm not sure how fast these things turn over in our local stores. My Fla garage/shop is a pretty hostile environment too.

Glad to hear (not really glad) that other people have had the same problem, so maybe it isn't the machine. You guys are beginning to convince me that it is the belts. If so, it sure doesn't make any sense to buy more than you need immediately.

I was so pissed, I looked at the thing and said maybe a good drop on the concrete driveway would fix it. Childish, but if felt good, and I was convinced it was the machine. The drop didn't do anything so I dropped it again and broke a little bit of the housing at the back. It still ran. Threw it in the garbage can along with the broken belts. After about an hour, I dug it out of the can and put it in a drawer with the intent of taking it apart later to see if I could do something with the tension spring. Some time this week I'll put the new HF belt on and see if it breaks.

Thanks.