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  1. #441
    If using R&P, yes spring load the pinion against the rack - this takes out 99% of the backlash, but also fit a stop to the motor/plate to stop it being able to disengage or jump the rack if overloaded, a jumping pinion will chew both rack and pinion instantly meaning an expensive fix, far better to stall the stepper.

    I use R&P on my plasma table and its been flawless so far.

  2. The Following User Says Thank You to Davek0974 For This Useful Post:


  3. #442
    Quote Originally Posted by Clive S View Post
    Dave

    For twin screws you need Linuxcnc V 2.8 master if you want independent homing. I you want to reverse on of the motors then you can just swap the phases around on the motor.

    What version are you using?
    It's not Dave it's me ;) I'm using the beta I've enabled the master repositories so should be bang up to date, it's does read 2.8 something on boot.

    I was hoping it was just an option in the ini to invert them you can do it from the stepconf but that's no good for setting up dual ballscrews.

    I guess swap the wires around will be the easiest solution.

    My brother asked me what I want for Xmas was going to ask for a 3nm nema 23 which I'll fit to the gantry and swap the 2nm from the gantry to the Z.
    Last edited by Desertboy; 16-12-2017 at 01:16 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 ;)

  4. #443
    Quote Originally Posted by Davek0974 View Post
    If using R&P, yes spring load the pinion against the rack - this takes out 99% of the backlash, but also fit a stop to the motor/plate to stop it being able to disengage or jump the rack if overloaded, a jumping pinion will chew both rack and pinion instantly meaning an expensive fix, far better to stall the stepper.

    I use R&P on my plasma table and its been flawless so far.
    I was thinking a dual pinion setup to remove the backlash, if I build this I'll put servos on it.

    When the time is right I should come down and give you fusion 360 lessons and you can help me with my R&P ;)

    Ordered myself a new phone

    https://www.banggood.com/Elephone-S8...r_warehouse=HK

    Cheap Chinese of course have better things to spend money on.
    Last edited by Desertboy; 16-12-2017 at 01:25 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 ;)

  5. #444
    It's not Dave it's me ;) I'm using the beta I've enabled the master repositories so should be bang up to date, it's does read 2.8 something on boot.

    I was hoping it was just an option in the ini to invert them you can do it from the stepconf but that's no good for setting up dual ballscrews.

    I guess swap the wires around will be the easiest solution.
    Sorry Me Can you post your ini and hal files and I will take a look, you can invert them in hal. I am In Spain again but back on Tuesday but I might be able to do it from here.
    ..Clive
    The more you know, The better you know, How little you know

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


  7. #445
    Quote Originally Posted by Clive S View Post
    Sorry Me Can you post your ini and hal files and I will take a look, you can invert them in hal. I am In Spain again but back on Tuesday but I might be able to do it from here.
    Enjoy the sangria & sunshine ;)
    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 ;)

  8. #446
    Got my MDF bed on now I need to make it a vac bed ;)

    I used an 18mm sheet
    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 ;)

  9. #447
    Quote Originally Posted by Desertboy View Post
    Got my MDF bed on now I need to make it a vac bed ;)

    I used an 18mm sheet
    Pics or it didnt happen :D

    Skickat från min SM-G955F via Tapatalk

  10. #448
    Click image for larger version. 

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ID:	23431
    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 ;)

  11. #449
    Looks neat ;)

    Skickat från min SM-G955F via Tapatalk

  12. #450
    Quote Originally Posted by Nr1madman View Post
    Looks neat ;)

    Skickat från min SM-G955F via Tapatalk
    It just fits and I mean just lol I had to tap it in the corners which is the fit I wanted was stressed about this cut as I had to outsource the cut and I knew it would be a bastard luckily I got a friendly a wood guy to help me out.

    As soon as you say i want 135.1cm *100cm people look at you funny lol.
    Last edited by Desertboy; 18-12-2017 at 06:19 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 ;)

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