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Catastrophic failure of bandsaw tyre

Mike G

Mike G

Petrified Pine
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Mike
I was cutting a piece of pine with my bandsaw a few minutes ago when there was a big bang and all sorts of noises there shouldn't have been. This was the scene on the table top:

9aa8U1r.png

The upper tyre had suffered a sudden unplanned disassembly:

etxwcb7.png

ufok7Xy.png

Some shockwaves must have got through to the lower tyre, too, because this also showed some damage, which hadn't been there previously:

noND3pH.png

So, where do I buy new tyres?

Just a suggestion, and I'm not actually sure what you'd be looking for, but if you are in any doubt about your tyres, it might be worth giving them a check. There's a good chance this will have cost me a blade (new last week).
 
Pretty dramatic. Wonder what caused that. Any chance that the blade itself destroyed the tyre?

Hopefully you can get new tyres for it Mike.
 
Wow that must have been a real brown trouser moment. :shock:
I tuned my old Startrite at the weekend and cleaned the tyres which look ok but mine seem to be more rubberised than yours.

What make and model is the saw Mike?
 
Lons":qae7wllc said:
.........What make and model is the saw Mike?
Click to expand...

expB0mq.png

It's the same machine as Trim's, but badged differently.
 
Lons":3l1wr0l5 said:
..... the tyres which ....seem to be more rubberised than yours.....
Click to expand...

Yes, these are some sort of plastic, and they're as brittle as hell. My old bandsaw had rubber tyres. Interestingly, the tyres themselves are flat, so the crown must be on the wheels.
 
AJB Temple":2dggvtcq said:
.........Any chance that the blade itself destroyed the tyre?......
Click to expand...

I guess it's not impossible, but I doubt it very much. Everything had been working rather nicely right up to the point when it wasn't. The machine was really nicely tuned, too, and working extremely well. Judging by the state of the plastic sitting here on my desk, this was an accident waiting to happen. It's extremely brittle, and I can snap off a piece of any length I want just by bending it once with my fingers.
 
:lol: :lol: What sort of scarf would you like me to cut, Bob? Edge-halved would be a bit of a test in 3mm thick material......
 
Mike G":3hyq7mok said:
:lol: :lol: What sort of scarf would you like me to cut, Bob? Edge-halved would be a bit of a test in 3mm thick material......
Click to expand...

Well some sort of blended join that would be held together by the rotation of the blade rather than a butt joint. I was thinking, glue on one end, shave down with a razor blade. Fit the rest of the rubber round and glued down over the shaved end. Allow to cure and then shave the joint as smooth as possible. Job's a good'un

Bob
 
I've spotted a tiny weenie little flaw in the "held-together-by-the-blade" idea, Bob.
 
Mike G":w1xvr2fk said:
I've spotted a tiny weenie little flaw in the "held-together-by-the-blade" idea, Bob.
Click to expand...

Lax text on my part. The direction of the scarf is such that the scarf is held closed rather than given the opportunity to lift. Contact adhesive to bond on the rubber all round the wheel.

Bob
 
Nightmare Mike.
Just from what you have posted I think it is the rubber the tyres are made of going hard over the last18 /19 years.

I have castors that had rubber tyres in the workshop and the same has happened to them. Gone hard and destroyed themselves when rolling stuff around.

Not something I would recommend but I've often wondered if I was in this situation wether a rubber belt could be stretched and bonded on ?
Cheers Andy
 
If stretch on tires are not available, or too expensive, or have bad reviews etc, then
it might be worth looking at this stuff which was in a thread titled something like ...
Anyone have success with homemade bandsaw tyres.

https://www.ebay.co.uk/itm/SOLID-PLY-RE ... pt=3285593

It's very very cheap, and presumablyone could bond it with regular contact adhesive, the likes of what you'd repair a shoe with.
 
toolsntat":yx4pm3oa said:
Nightmare Mike.
Just from what you have posted I think it is the rubber the tyres are made of going hard over the last18 /19 years.
Click to expand...

I looked at the badge and saw "2003" and I thought, "Oh, it's not that old" then I saw your comment and realised that the saw is actually old enough to officially drink and get married :shock:

A friend of mine had a bandsaw tyre explode with dramatic effect during running, the only difference being was that it was on a completely unguarded 115-year-old bandsaw running off a leather belt from an overhead lineshaft, he could see it was happening so he poked the tyre with an offcut to preemptively break it whilst it was running, mad man :lol:

I think Bob's lead on Bandsawspares.co.uk is your best bet unless there's some obscure rubber band supplier buried on some industrial estate somewhere that nobody knows about that would supply them for a fraction of the cost. Alas, I'm not aware of such a place existing but it wouldn't surprise me at all.
 
Cheers guys. I'll be on to them first thing ion the morning.
 
Trevanion":2akp2z5h said:
the saw is actually old enough to officially drink and get married :shock:
Click to expand...

It won't be long before mine is old enough to qualify for an early pension. :lol: :lol:
 
a large format 3D printer and a TPU filament could make made to measure tyres for this and given the direction of movement they would be pretty stable.

you'd have to approach a few of the online services and see if they have an direct FDM with a 20" print bed available for flexible materials though.

https://www.hubs.com/3d-printing/fdm/#fdm-materials
 
£50ish for a pair of new tyres feels a bit steep, but after having such a big bang and having parts of the old tyres appear on my workpiece, I won't be risking making my own, having a 3D printed version, or using something not designed for the purpose. I'll just grit my teeth and buy the new ones.

The chap at Bandsawparts was very helpful, and did say that it sounds like they were plastic tyres rather than polyurethane.......but plastic tyres have only been in use for about 10 years, so were likely an after-market part. The polyurethane, he assures me, won't harden or go brittle. I'll place the order this evening when he gets back to the office.
 
Interesting Mike, the tyres on mine are grey and definitely a hard rubber rather than plastic. They may have degraded over time causing it I guess but they look different to mine, mine are also clearly crowned so perhaps different wheels...?
 
Are your tyres crowned, Mark, or is it the wheels? My tyres are flat, but the wheels are crowned producing a crowned appearance to the tyres.
 
Good question Mike, I don't know tbh and without taking the tyres off I'm not sure it's possible to tell is it?

There's no online info on my saw and I've been in dialogue with Axminster but they don't have the historic specs and technical detail any more so I can't even dig into that.

I found that a little strange as I would have thought that (and were I to own a business then I would do this) any product information AT ALL would be archived when that product is superseded or EoL.
 
TrimTheKing":r6h3fsep said:
Good question Mike, I don't know tbh and without taking the tyres off I'm not sure it's possible to tell is it?

There's no online info on my saw and I've been in dialogue with Axminster but they don't have the historic specs and technical detail any more so I can't even dig into that.

I found that a little strange as I would have thought that (and were I to own a business then I would do this) any product information AT ALL would be archived when that product is superseded or EoL.
Click to expand...

Axminster used to be very good at providing manuals for obsolete products but sadly no longer so.
Maybe there has been experience that supplying OOD manuals implies that support for parts is available when it rarely is. From my visit to AX HQ years ago, they used to keep odd machines on the shelf as parts donors but that possibly took up valuable space needed for stock.

Bob
 
Yep, I understand the premise Bob, but if they're going down the route of badging up CCC as their own then the very least they can do, IMO, is keep a PDF on their systems of the tech specs and user manuals. Should I start a business then I would keep that info for every item I've ever sold.
 
TrimTheKing":1vt4gn64 said:
Yep, I understand the premise Bob, but if they're going down the route of badging up CCC as their own then the very least they can do, IMO, is keep a PDF on their systems of the tech specs and user manuals. Should I start a business then I would keep that info for every item I've ever sold.
Click to expand...
Totally agree Mark but Axi have radically changed their business model in the last decade or so.
They manage to keep their good service reputation despite reduced support in terms of spares and manual down loads
Bob
 
Rubber tires should be available someplace. I know of at least two sources in the US, so you should be able to find some there.

If you do end up with urethane tires, be sure to glue them on. The previous owner of my 14" saw put urethane tires on it and after a while they loosed up and walked off the wheel. Not as exciting as your moment, I'm sure, but attention-grabbing none the less.

Kirk
 
I've fitted my new tyres.....polyurethane. I was a little worried that they were about 0.8mm wider than the ones which came off, but as they stretched lengthise to fit onto the rim, they thinned out a little in width and ended up fitting really snugly. It was a bit of a wrestling match to get them on. Here they are warming in front of a fan heater:

hQ9ZgQo.png

And in situ:

Yz2lXVl.png

They have made a really big difference to the bandsaw. I've always been a bit bothered that this new machine was quite loud, but the new tyres have quietened things down enormously. It purrs along now. And it is also smoother. So, if you hear your machine getting a bit louder than you'd like, or if there is a bit of roughness to its action, then have a good look at your tyres. It may well be time for a change.
 
aren't there some special tyres for sale in the states...
obv not cheap.....?
interesting to know.....
 
clogs":3ftik290 said:
aren't there some special tyres for sale in the states...
obv not cheap.....?
interesting to know.....
Click to expand...

These tyres were from the States. A brand called "Sulphur Grove Tool". They seem to have a lifetime guarantee, whatever that means.
 
I have orange polyurethane tyres on my Inca. I put off putting them on for a while, as I was dreading the wrestling, but in the end, after a soak in hot water, they went on without too much swearing.
 
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