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  1. #31
    Quote Originally Posted by Karl View Post
    That raises the question: What brand/source of pulleys/belts are currently in fashion/recommended?

    {Presumably, belt manufacturers/suppliers provide tensioning guidance?}
    I always use HTD 5mm pitch 15mm width and a good brand is Gates, medway etc. If you go to any good bearing supplier and tell them you want quality brand not the cheap veriety they should be able to help.

  2. Quote Originally Posted by JAZZCNC View Post
    ... HTD 5mm pitch 15mm width and a good brand is Gates, medway etc...
    Many thanks. Are more pulley teeth better than less? Eg for a gearing ratio of, say, 1:2 is there anything to be gained from using 12:24 teeth pulleys as opposed to 20:40 teeth?

    Karl

  3. #33
    Yes it's all about teeth in mesh.!! With small pulleys there are less teeth engaged between belt and pulley, less teeth engaged means less able to handle high loads and reduce the amount of torque that can be transmitted and if wrong will rip teeth off the belt.

    Read these and it will explain lots. . http://www.roymech.co.uk/Useful_Tables/Drive/Timing_belts.html


    http://www.ondrives.com/data/pdf/pul...belts-tech.pdf

  4. The Following 2 Users Say Thank You to JAZZCNC For This Useful Post:


  5. #34
    Jazz did you hear anything from Chai?
    With 6 plastic inserts they must have 6 rows of balls, as each insert is a ball return tube. Additionally they're not going to use 3, or any odd number, rows of balls as that would result in uneven wear and all sorts due to having more balls running in one track...
    I wonder if they're preloaded. A twin start screw with offset tracks in the nut is one way to apply preload - that would make them worthwhile.

    As a general rule of thumb don't go below a 15T pulley with 5M HTD belts, and if you need much above 3:1 use double reduction. Use one of the many on-line calculators to find the number of teeth in mesh on the smallest pulley. They will give a warning if it is below 5...

    http://www.sdp-si.com/cd/default.htm

  6. #35
    Quote Originally Posted by Jonathan View Post
    Jazz did you hear anything from Chai?
    With 6 plastic inserts they must have 6 rows of balls, as each insert is a ball return tube. Additionally they're not going to use 3, or any odd number, rows of balls as that would result in uneven wear and all sorts due to having more balls running in one track...
    I wonder if they're preloaded. A twin start screw with offset tracks in the nut is one way to apply preload - that would make them worthwhile.
    No not heard anything yet but I only sent email late last night so don't expect too.

    It's a flop over type nut so Yes it's 6 rows but 2 x 3 circuits per start. Like this http://motionsystemdesign.com/images...-ballscrew.jpg

    Well thats how believe they are setup but I'm not striping it down to findout.:lol:

    Yes by the feel of it I do feel that it's slightly preloaded as well.??

  7. #36
    Hi Jonathon,
    Are these still available.

    Dean

  8. #37
    They've sold to Jazz, sorry.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  9. #38
    And he has the nerve to bad mouth you ?
    I'd have scrapped them first................
    John S -

  10. #39
    Quote Originally Posted by John S View Post
    And he has the nerve to bad mouth you ?
    I'd have scrapped them first................
    Now there's an idea ... we've not actually managed to get them posted yet! Parcels2go failed to collect twice so going to try again on Monday.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  11. #40
    Quote Originally Posted by John S View Post
    And he has the nerve to bad mouth you ?
    I'd have scrapped them first................
    John I'm a professional.?? . . . I never mix business with pleasure. .

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