Thread: Linisher belt breakage

I hate to ask the obvious but did you have the arrows/direction going the right way? or is there something protuding somewhere that might be catching them? You prob already checked them but all I can think off other than tesion maybe Good luck, expensive exercise Grahame.

i have one of these http://www.jwross.com.au/news/docume...2004-08-41.pdf to for at least 15 years and never broken a belt and mine are just hung on the nearest thing that sticks out for storage. only thing i can think of that maybe they dont make the joining tape like they used too ( does any one know where you can get it from)
john

What about the Sandpaperman ?, a forum supporter he may be able to help.

Kev.

As above mine is a multi tool as well.

The tension self adjusts via the internal spring.The rotation is correct as per arrows. Just taking rust off flat and angle section.
I am making tool hanging brackets for school and some for my shop.Dressing is performed on the trail portion of the wheel as I have for years.

Will go to town tomorrow and buy a new stack of belts. The last belts where from the web and and some from Bummings bargain bins.

Grahame

A mystery, as John said, mine just hang on a nail on the wall.

Modern belts are joined with polyurethane glue with a polyisocyanate accelerator to speed up the cure time from 24 hours to 30 seconds or so. The tradeoff for faster production and improved strength and heat resistance given by the isocyanate is the glue doesn't last as long. Belt joiners know this and try to keep stock fresh but occasionally you'll get a store selling you old belts with dead glue that fail immediately. It's not good to store belts for long.

The accelerator is known as Bostik Desmodur RFE and is the secret ingredient belt joiners will not tell you about as it would allow you to join your own belts fresh. It needs to be bought in a metal bottle as moisture seeping through a plastic bottle will degrade it and it has a very short shelf life and has to be flown into Australia fresh. I'm having good success with "Vise" brand glue from Bunnings to join belts, it must set for 24 hours to reach maximum strength though, 12 hours is only half strength and can fail. Desmodur is an interesting additive, apparently it will speed up the drying time of some paints drastically as well as hardening them including enamel.

Greyham, At my local bearing supply it is possiable to purchase an iron on belt joiner (the same princable as joining carpet) It seems to work well for me. I also have had great success with Smith and Arrow brand from Smith and Arrow on EVILBAY....
Matt

Originally Posted by Graziano

Modern belts are joined with polyurethane glue with a polyisocyanate accelerator to speed up the cure time from 24 hours to 30 seconds or so. The tradeoff for faster production and improved strength and heat resistance given by the isocyanate is the glue doesn't last as long. Belt joiners know this and try to keep stock fresh but occasionally you'll get a store selling you old belts with dead glue that fail immediately. It's not good to store belts for long.

I had a similar run with large linisher belts at work, and tend to agree with Graziano. The belts were stored for too long, in the mezzanine area of the workshop, which gets pretty hot in summer. I reckon age and temperature weakened the bond, and many of them let go, causing some interesting moments!

Cheers,

Originally Posted by Andy Mac

and many of them let go, causing some interesting moments!

Cheers,

I know a guy whose arm muscle below the shoulder require 15 stitches from a linisher belt whipping around the far wheel after it let go. A steel rod is mounted parallel to the belt a few inches above the wheel on some industrial linishers to prevent such an accident.

Hi Grahame,
This is not exactly the same.
I bought a Metre of Hermes 406 J Flex, for my small 4in. Belt Sander a few years back. After a bit of preparation, I glued mine with Loctite 401 Super Glue, with a bit of weight on the join.
The 401 might be the answer. I never had a problem.
Regards,
issatree.