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9th May 2012, 10:51 AM #1Diamond Member
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Small Flat Belt Pulley re Bobs enquiry
Hello everyone
Here is a follow up to Anorak Bobs recent mention of flat belt & vee pulleys for his Tool & Cutter grinder restoration job.
I made hundreds of these small idler belt tensioners for a 1/4" & 1/2" wide abrasive belt machine,using the Turret attachment on the Hercus 260 lathe.
The pulleys had to spin at 25,000 rpm so concentricity was important.
After drilling & boring to 5 thou undersize & reaming to .625" the pulley was mounted on a mandrel between centres, A plunge cut, with the lathe in back gear using a form tool as shown in the photo was used to form the crown & flanges on the pulley.
Bearings were then loctited into position.
An interesting little bit of turning.
regards
Bruce
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9th May 2012, 11:30 AM #2.
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Thank you Bruce.
Can you tell me more about the flat belt you used?
I made enquiries at Statewide Bearings about the availability of over the counter flat belts and it appears that there is not a ready source and that I would have to have a belt made up. I have been looking on Ebay for belts.
BT
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9th May 2012, 11:31 AM #3
job
That's a neat result
Was it a contract job or something ? Hundreds made ?
Mike
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9th May 2012, 01:13 PM #4Diamond Member
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Abrasive Belt machine
Mike I had my own Abrasive business for about 40 years.
This was a small replacement part, I made for one of the machines we sold.
Many parts were made over a number of years.
The small pulley allowed narrow abrasive belts 1/4" & 1/2" wide to track accurately.
These days I have more time for fiddling around making things I want to do & picking up valuable insights off the forum.
Its a good life
regards
Bruce
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9th May 2012, 01:40 PM #5Philomath in training
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Bob, try Rydell industrial belting in WA. I had to get a new feedbelt for the lathe and they (SA branch) were able to make one for me - wasn't cheap but it works really well.
Michael
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9th May 2012, 03:03 PM #6
Hi Bob,
I recently had to get a new belt for my lathe. I had the opportunity to get an endless one made, but ended up just getting a length of belt, 1400 x 30mm wide, and a joiner. It cost about $60. There is a thread here: How do YOU get flat belts to do their job ? I have been reading with interest about flat belts.
Ewan
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9th May 2012, 03:58 PM #7Diamond Member
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9th May 2012, 04:57 PM #8Golden Member
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Hi Bob,
I'm not 100% sure what size flat belt you are looking for but in your Hercus T&C spindle belt thread you mentioned that the manual stated a "225L075 Timing Belt" which would be 22.5" long x 3/8" tooth pitch x 0.75" wide.
I'd try a bearing supply shop to see if they can get one.
I know a few blokes who use timing and multi v fanbelts as flat belts, they just run them inside out with the flat back of the belt running on the pully.
I'm not sure if that's what Hercus did bit it might be an option for your machine.
Cheers,
Greg.
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9th May 2012, 05:03 PM #9.
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9th May 2012, 05:11 PM #10Diamond Member
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Bob
Now that I have a close look at that vee pulley, it looks like its done one heck of a lot of work. The ridge or raised section down the bottom of the vee appears to be the original.
If the pulley is made of cast iron or steel, then its had a lot of wear, & a lot of use.
Fairly easy to machine up a new one, say out of a piece of cast iron.
A nice turning job
regards
Bruce
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9th May 2012, 05:12 PM #11.
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Michael, Ewan and Greg.
Thanks for your suggestions. If I retain the vee belts to drive the spindle I'm still faced with the task of obtaining a flat belt for the high speed internal spindle. I had a belt made up locally by a firm called Habasit, for my tool post grinder. They did a neat job of splicing the joint. The belt is more substantial than the original Dumore belts and works well. Using the Dumore is another thing.
BTLast edited by Anorak Bob; 10th May 2012 at 08:06 AM. Reason: Had to have Combustor show me the correct spelling of Habasit! Thank you Combustor.
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10th May 2012, 01:47 AM #12Senior Member
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- May 2012
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- Kimberley, West Australia
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Spliced flatbelt.
Agree with Anorak Bob about Habasit belts. Had to replace a flatbelt on a lathe some years back, as joiners were a permanent source of trouble. Did not want to strip the complete machine head to fit a continuous belt, but they were good enough to supply a prepared belt, a bottle of their special splice fluid and full instructions on splice procedure and heat bonding. Worked perfectly, and the machine ran smoother, quieter and delivered more of the power than ever before. A very good way to go, fully recommended.
Combustor.
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10th May 2012, 06:10 PM #13Golden Member
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10th May 2012, 06:28 PM #14.
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10th May 2012, 06:46 PM #15Golden Member
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