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  1. #1
    Hi,
    I want to convert my bottom axis Axis, dual motor to belt drive.
    I have 2 nema 23 4nm motors to fit on this axis over doubling the torque.
    https://www.cnc4you.co.uk/Stepper-Mo...H401-03-Nema23

    I have 2 questions
    What T5 pulley should I use?
    What T5 belt?

    Will this Belt do?
    https://www.cnc4you.co.uk/T5-Pulleys...ming-Belt-20mm

    And are these pulleys even suitable?
    https://www.cnc4you.co.uk/T5-Pulleys...ith-grubscrews

    I see grubscrew and think 4nm is a lot of torque to hold on 4 grubscrews.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  2. Quote Originally Posted by Desertboy View Post
    Hi,
    I have 2 questions
    What T5 pulley should I use?
    What T5 belt?
    Unhelpful answer, but why T5 and not e.g. HTD? or GT2?, improved backlash and better high speed performance (random google).

  3. The Following User Says Thank You to Doddy For This Useful Post:


  4. #3
    I have 2 questions
    What T5 pulley should I use?
    What T5 belt?
    HTD 5 would be a better belt and pulley

    https://www.beltingonline.com/timing-pulleys-bars-272/
    ..Clive
    The more you know, The better you know, How little you know

  5. The Following User Says Thank You to Clive S For This Useful Post:


  6. #4
    Quote Originally Posted by Clive S View Post
    HTD 5 would be a better belt and pulley

    https://www.beltingonline.com/timing-pulleys-bars-272/
    Does size matter?

    Thinking how many teeth and how wide the belt is. Guessing widest belt is better but pulley diameter not so important.

    I have 4nm Nema 23's I want to run 1:1 gear ratio.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  7. #5
    I would personally run the smallest gear possible as there us less weight to turn

  8. The Following User Says Thank You to johngoodrich For This Useful Post:


  9. #6
    Wide and small?
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  10. #7
    First, convert to a belt drive from what.?

    HTD is the belt to use. Pulley size will depend on how you do it and the resolution you want. Don't think because it's a 5mm pitch belt that's the actual pitch or linear movement you'll get because it's not. The diameter of the pulley x Pi is the actual pitch you'll end up with. So depending on how it's done and pully size you could need a gear ratio to give the resolution you need.!

  11. The Following User Says Thank You to JAZZCNC For This Useful Post:


  12. #8
    Quote Originally Posted by JAZZCNC View Post
    First, convert to a belt drive from what.?

    HTD is the belt to use. Pulley size will depend on how you do it and the resolution you want. Don't think because it's a 5mm pitch belt that's the actual pitch or linear movement you'll get because it's not. The diameter of the pulley x Pi is the actual pitch you'll end up with. So depending on how it's done and pully size you could need a gear ratio to give the resolution you need.!
    Coupling driven, I'm upgrading the motors and would like to undersling the motors more for space than anything else, 1610 ballscrews.

    I was going to run on a 1:1 ratio I was hoping it was a case of 2 matching pulley's just different ID mounts.

    I'll get some photo's when it's light it becomes obvious in the day light.

    I'm happy with 0.05mm resolution per step the 1610 gives me.
    Last edited by Desertboy; 18-02-2020 at 08:00 PM.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  13. #9
    I found a (bad) pic of the motor mounts, I ditched those flexible couplings as soon as I actually tried to use the machine. Having cutting problem, they were the first thing I replaced.

    Click image for larger version. 

Name:	tension belt.png 
Views:	23 
Size:	1.03 MB 
ID:	27416

    And one from when I was still building it, I have it on a catering table now and connected to a DDCSV.

    Click image for larger version. 

Name:	motor mount.JPG 
Views:	19 
Size:	412.9 KB 
ID:	27417 you can see the mounts better.

    I want to flip the motor mount upside down, then mount the motor under the machine. The motor mount has 4 mounting holes which align with 4590 aluminium track. I can slide the mount left and right to tension the belt before bolting down with T nuts.

    Motor mount is 10mm thick aluminium plate NOT ecocast.

    I have the machine in a van so undersling the motors will create me a little more space and protect the motors.

    I have bolted an extra piece of 4590 behind the machine to space it off the ply.

    That groove isn't from the machine but it does line up perfectly LOL.
    Last edited by Desertboy; 18-02-2020 at 07:16 PM.
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

  14. #10
    Would something like this be suitable with the right bore for the Nema's and Ballscrew?

    https://www.beltingonline.com/16-too...16-5m-25f-7792
    http://www.mycncuk.com/threads/10880...60cm-work-area My first CNC build WIP 120cm*80cm

    If you didn't buy it from China the company you bought it from did ;)

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