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Round belting

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John Haine15/11/2018 17:49:43
4622 forum posts
273 photos

Some years back I bought some ~6mm orange polyurethane round belt with little barbed joiners for my Quorn. The belt was like a thick walled tube and the joiners had circular barbed points at each end that you pushed into the bore of the tube. They seem to work well and now I want some more for my little Unimat that's having a proper motor fitted. Anyone recognise this and know where to find it please?

The modern stuff I've seen from RDG and Chronos seems to be joined by melting which doesn't strike me as very secure.

Nick Hulme15/11/2018 18:11:09
750 forum posts
37 photos

John,
I use a 4mm round green Polyurethane belt which is joined by melting, I've been running a 28,800rpm engraving spindle with a belt I welded using a disposable gas lighter, it's only lasted me 5 years, so far.

- Nick

anthony smith 415/11/2018 18:30:51
10 forum posts

HI JOHN LATHES .CO.UK KEEP BELT YOU WANT

Roderick Jenkins15/11/2018 19:31:33
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2176 forum posts
608 photos

Stationary Engine Parts also stock it: **LINK**

HTH,

Rod

ian j15/11/2018 19:50:17
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308 forum posts
328 photos

John.

I bought a bespoke 6mm orange polyurethane belt from here :-

**LINK**

There are various diameters and types . If I remember correctly it was not much more than the type you join either by heating or with the barbed connectors.

Ian

ega15/11/2018 23:32:16
2486 forum posts
199 photos

John Haine:

Do the barbed connectors bump when they go round the small pulleys on the Quorn?

Mark Rand16/11/2018 00:56:57
1236 forum posts
28 photos

Welded polyurethane belt works very well. The trick to joining it is to hold/clamp it for much longer than seems reasonable after welding it. I don't know if it just takes a long time to solidify at the centre or if there is some sort of crystallisation going on, but it needs much more time than just the surface setting.

John Haine16/11/2018 07:21:07
4622 forum posts
273 photos

Thanks all! I think I'm sorted.

ega: no they don't.

Ian S C16/11/2018 08:56:41
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7468 forum posts
230 photos

When I join the plastic belting, I heat a steel strip (an old kitchen knife), then hold the ends to the metal strip, then hold the ends together while pressing the belt into the V of a bit of angle iron to keep it aligned. I use two 5 mm belts on the Super Adept lathe, and I use 3 mm belts for drive belts on my hot air motors, all of these have been in use for over 15 yrs, maybe nearer 20 yrs. I use the green coloured stuff, it has a slightly rough surface, the first type that I got nearly 30 yrs ago was a pale colour(maybe cream). and it eventually became brittle.

Ian S C

ega16/11/2018 09:45:54
2486 forum posts
199 photos

John Haine:

Thank you - good to know.

I am using a vacuum cleaner belt on mine but may try the barbed connector route. I believe that someone has used polyvee on their Quorn.

Ian S C17/11/2018 09:20:25
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7468 forum posts
230 photos

Thin heat joined flat belt is a good drive for tool post grinders, and I think it would do well on a tool and cutter grinder. It is recommended that the flat belts are joined by the professionals.

I have used O - rings, these can be cut and joined with super glue, I made a jig to cut the ring so that the cut was about 30* to the length to give an increased glue area, it's held up well, although its a bit stretchy.

Ian S C

Grindstone Cowboy17/11/2018 15:46:19
854 forum posts
64 photos

Probably too late, but I was just looking for something else on GLR Kennions site and found this belting **LINK**

Dave Halford17/11/2018 16:19:16
2001 forum posts
23 photos

Wasn't the barbed hollow belting also sold as emergency fan belts back in the last century?

I used some of the poly melt joining stuff for an IC model boat starter belt, it never broke despite the miss treatment I gave it. 15 years later it was rotted by the fuel

Edited By Dave Halford on 17/11/2018 16:23:35

ega17/11/2018 16:22:30
2486 forum posts
199 photos
Posted by Dave Halford on 17/11/2018 16:19:16:

Wasn't the barbed hollow belting also sold as emergency fan belts back in the last century?

Possibly by you!

Dave Halford17/11/2018 16:26:11
2001 forum posts
23 photos
Posted by ega on 17/11/2018 16:22:30:
Posted by Dave Halford on 17/11/2018 16:19:16:

Wasn't the barbed hollow belting also sold as emergency fan belts back in the last century?

Possibly by you!

Via Arry Moss or Hoddy Patkirk smiley

BOB BLACKSHAW03/12/2018 10:13:47
446 forum posts
110 photos

As I am on my 5th Gates 5m710 belt as they keep splitting, plus they are expensive to buy, these polyurethane belts look like the answer for me.

The two types, glue together or connector, which would be the best for the drive on my lathe,I have variable speed so the belt will not start with full load.

Bob

John Haine03/12/2018 10:20:57
4622 forum posts
273 photos

Bob, I can't comment for the welded ones but the barbed connectors seem OK. But I'm not sure if you can get the round belt in a large enough size? Have you considered using a twist link belt?

Michael Gilligan03/12/2018 10:52:59
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20055 forum posts
1040 photos

This type of 'textured' belt from China: **LINK**

https://www.ebay.co.uk/itm/3Meter-PU-Transmission-Belt-for-Watchmaker-Lathe-Jewelers-Belt-Watchmakers-4mm/301701793135

appears very similar to the rather pricey Swiss product.

MichaelG.

.

Edit: I purchased mine from ebay seller MerlinTools, but it is probably 'generic'

... various diameters are available.

Edited By Michael Gilligan on 03/12/2018 10:54:16

Clive Foster03/12/2018 12:29:08
3103 forum posts
107 photos

The thin flat belts work very well on higher speed drives. The yellow one supplied for my Clarkson grinder running at 2,800 rpm on 3 inch (ish) diameter pulleys is more than satisfactory. However a green one bought from a transmission / bearing place for my SouthBend lathe many years ago didn't work very well. Torque transmission appeared to be limited and it was very prone to slip on all but the highest speed where it proved just barely adequate.

Digging into the technical data eventually revealed that torque transmission of these thin belts is very dependant on surface speeds. It seems that stye of belt is generally optimised for high speed duties so technical data should be checked before using in other than like for like or factory / spares supplier approved duties. As I recall it they do vary and there is a reason for the different colours.

I eventually got a leather faced fibre glass cloth backed Stephens Miraclo belt for the SouthBend which was wonderful.

Clive.

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