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Unimat SL belts & bearings

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rofor27/02/2011 09:59:00
1 forum posts
Hi from Ro in North Devon,
 
I have picked up an old Unimat SL which requires new belts, plus new headstock and idler bearings. I`m hoping some other Unimat users here might be able to offer advice.
I am uncertain if I should use round belts 4mm wide as currently on sale on ebay or 5.3mm.
 
Regarding replacement bearings, e13 and e6 are mentioned and I am hoping for advice on where to buy them. These bearings seem to be termed magneto bearings.
 
I reluctantly parted with my Harrison 140 and Harison univeral mill a while ago because of disabilities but am looking forward to tinkering with a small lightweight bench lathe.
 
Any help in pointing me in the right direction would be much appreciated.
KWIL27/02/2011 12:31:20
3681 forum posts
70 photos
e13 Magneto bearings are 13mm OD, try www.akbearings.co.uk Arc Euro Trade has e6. I do not know about Unimat belts.

V8Eng27/02/2011 19:31:55
1826 forum posts
1 photos
Hi.
 
Try this, it lists lots of parts for many makes / models.
 
 

Edited By V8Eng on 27/02/2011 19:33:59

JasonB27/02/2011 19:47:12
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25215 forum posts
3105 photos
1 articles
This guy does belts & bearings, not sure what postage from the US will be
 
Nicholas Farr27/02/2011 20:51:08
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3988 forum posts
1799 photos
Posted by KWIL on 27/02/2011 12:31:20:
e13 Magneto bearings are 13mm OD, try www.akbearings.co.uk Arc Euro Trade has e6. I do not know about Unimat belts.

 
 
Hi Kwil, I think you ment to say that the ID is 13mm, i.e. the bore. The OD being 30mm and the width 7mm.
 
Most bearing distributers supplying industry should be able to supply you with any available bearings and most of them accept cash sales.
 
Regards Nick.
David Clark 127/02/2011 21:09:04
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3357 forum posts
112 photos
10 articles
Hi There
Use O-rings for Unimat belts.
Works out at about 50P each.
I think I gave sizes in MEW 124 or just after.
If you are a subscriber, you can access them in the archives.
regards David
 
Keith Long27/02/2011 21:18:16
883 forum posts
11 photos

Just do an internet search on "magneto bearings" you'll find a number of stockists. Price seems to be about £5.50 + vat each for those sizes.

Keith

Niloch07/03/2011 19:29:22
371 forum posts
Unimat belts: two friends got fed-up with paying silly prices for the required belts. They clubbed together and bought suitable 'O' rings from here.
Ian S C08/03/2011 09:52:45
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7468 forum posts
230 photos
Why not use heat joinable plastic belting, it gives a more possitive drive than 'O' rings, it lasts well, if it breaks join it again. It does'nt stretch as 'O' rings do. If you have choice between 4mm and 5.3mm, use 5mm belting, thats the stuff I use on my Super Adept, it could actually be OK with down to 3mm that what I use to drive off my Hot Air Engines.
Ian S C
ady08/03/2011 11:40:45
612 forum posts
50 photos
The 5mm belting I used on my wee unimat protruded beyond the pulleys, even at 4.68 mm it's still too big and would catch on part of the lathe when on its most extreme drive wheel settings.
 
The 4mm belting sits inside the pulleys and has no interference issues.
 
It's easy to check, use a drill bit of 4mm and 5mm and see how they fit, even a 4.5mm drill bit wont fit into my own pulleys.

Edited By ady on 08/03/2011 11:42:09

dcosta08/03/2011 11:46:51
496 forum posts
207 photos

Hello rofor!


In the eighties I had a Unimat3 and faced the same problem You are facing now.

And also tried the o'rings of the common kind, perhaps made of rubber. And they failed after some hours of light work.

Maybe the variety made of Viton whose mechanical properties I ignore is better for the purpose.

The pulleys in Unimat 3 had a round profile and I think the same goes with Unimat SL. If so, You should take in consideration You mustn't use trapezoidal belts with Unimat SL.


Warning:
Viton is incompatible with aceton and organic acids such as acetic acid.
Note:
For more information on Viton see: http://en.wikipedia.org/wiki/Viton



Best regards
Dias Costa

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