Belt sander problem

[Cret]

I've got a bench mounted belt sander which is a mega handy piece of kit but currently I cannot get the belt to stay on properly.

It's one of these:
http://www.dbkeighley.co.uk/masters/rexon_bd46a_eds300a.htm

When I bought it, I had the same problem, and no amount of adjusting the belt tracking adjuster (either direction) would help keep the belt on.
Eventually I removed some bits at the drive end of it to inspect them and see if they were straight etc. Could not find any issue so I reassembled and it suddenly was ok.

Now the belt is worn so I bought some new ones, and when I swapped to a new one, I'm back to square one!

Any ideas what can cause the belt to try and run straight off with a machine like this, regardless of the position the tracker knob is set to?
The belt doesn't actually come fully off, but it rapidly moves so it's about 30-50% on the machine.

Cheers!

 

[the snooper]

not a sealey is it

 

[MattF]

There should be a slight crown towards the centre of the rollers, if it uses the same principle as flat belt pulleys. It could be that the rollers are worn.

 

[Cret]

Thanks chaps - no, it's a rexxon.

I found the problem quite easily actually. Not sure how it worked previously but basically when I bought it from B&Q it was the last one and a display model. I got it half price but had to bully them into selling it to me with no instructions due to H&S malarky.
I printed some off the web and took them in in the end!

Anyway, the belt was on from the moment I bought it, and it transpires it wasn't correctly fitted! There's a large thin guide plate beneath the main bar that the belt runs around and the belt was round the outside of this. I think it flexes easily so get it in the right spot and it runs ok by coincidence but otherwise it'll cause ballache.

Run the belt inside this plate though and it's a doddle.

Simples (embarrassingly so!).

 

[Cret]

By the way - word to the wise: I discovered that with a new 60 grit belt wizzing round it's not a good idea if your fingertip touches on the belt. Not even for a split second.

Ouch!!

 

[brightspark]

By the way - word to the wise: I discovered that with a new 60 grit belt wizzing round it's not a good idea if your fingertip touches on the belt. Not even for a split second.

Ouch!!

bet u glad u havent a rotary planer

 

[Cret]

I have got one.

Have got all manner of finger removing machines but fortunately I've.....no, on second thoughts I'm not going to tempt fate!!

 

[Robotstar5]

Have got all manner of finger removing machines but fortunately I've.....

But only a limited number of fingers!