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  1. #1
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    Default 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

  2. #2
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    Default

    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

  3. #3
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    Default job

    That's a neat result

    Was it a contract job or something ? Hundreds made ?

    Mike

  4. #4
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    Default Abrasive Belt machine

    Quote Originally Posted by morrisman View Post
    That's a neat result

    Was it a contract job or something ? Hundreds made ?

    Mike
    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

  5. #5
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    Default

    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

  6. #6
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    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
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    Default

    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

  7. #7
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    Default Flat Belts

    Quote Originally Posted by Anorak Bob View Post
    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
    Bob
    The flat belts used on this pulley are small abrasive belts, grinding belts, cloth backed which we manufactured,
    They are 1/2" &1/4" wide by 18" or 24" long. Very smooth running.
    I have included a photo.
    regards
    Bruce

  8. #8
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    Default

    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.

  9. #9
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    Default

    Sorry Bruce,

    The 25,000 rpm threw me off. I thought it was a drive belt.

    I was looking at a photo I had saved of the grinding head of another No.3 T and C grinder and it is now apparent that my spindle pulley is worn out. It may be more expedient to just make another duplex vee pulley.

    BT

  10. #10
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    Quote Originally Posted by Anorak Bob View Post
    Sorry Bruce,

    The 25,000 rpm threw me off. I thought it was a drive belt.

    I was looking at a photo I had saved of the grinding head of another No.3 T and C grinder and it is now apparent that my spindle pulley is worn out. It may be more expedient to just make another duplex vee pulley.

    BT
    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

  11. #11
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    Default

    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.

    BT
    Last 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.

  12. #12
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    Kimberley, West Australia
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    Default 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.

  13. #13
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    Default

    Quote Originally Posted by Anorak Bob View Post
    Sorry Bruce,

    The 25,000 rpm threw me off. I thought it was a drive belt.

    I was looking at a photo I had saved of the grinding head of another No.3 T and C grinder and it is now apparent that my spindle pulley is worn out. It may be more expedient to just make another duplex vee pulley.

    BT
    I have a higher resolution version of that Hercus T&C if you want it Bob.

  14. #14
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    Default

    Quote Originally Posted by Graziano View Post
    I have a higher resolution version of that Hercus T&C if you want it Bob.
    Mark,

    I would be a grateful recipient of anything you might have on the No.3. There are few images available online and my machine is missing a number of parts. Knowing what those parts look like would be a great help.

    Bob.

  15. #15
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    Default

    Quote Originally Posted by Anorak Bob View Post
    Mark,

    I would be a grateful recipient of anything you might have on the No.3. There are few images available online and my machine is missing a number of parts. Knowing what those parts look like would be a great help.

    Bob.
    No drama, cane farmer!!, I'll message you now....come to think of it another friend has one tucked in the corner of his workshop with cylindrical grinding attachment fitted. I'll take a look and see what model Hercus it is.

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