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IndustryArena Forum > CNC Electronics > CNC Machine Related Electronics > Building PicSteps - Trying to find missing specs for the BOB
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  1. #1
    Join Date
    Nov 2009
    Posts
    4

    Question Building PicSteps - Trying to find missing specs for the BOB

    Hi all,

    I've started building my PicSteps, including the Break-out Board and the input daughter board. Some pics attached for people wo like pictures


    Just one question: for those who have already built the BOB, what values are the TBA resistors ?

    regards,
    Raf
    Attached Thumbnails Attached Thumbnails IMGP2707b.JPG   IMGP2709b.jpg   IMGP2712b.jpg   IMGP2726b.jpg  

    IMGP2731b.jpg  

  2. #2
    Join Date
    Feb 2005
    Posts
    521
    Hi Raf,

    I think I used 470R.

    There is a bit more info and trouble shooting around this post...

    http://www.cnczone.com/forums/showth...-bob#post76429

    ...jeez where'd those last 4 years go ?!?!

    Good luck!
    www.cambam.co.uk

  3. #3
    Join Date
    Nov 2009
    Posts
    4

    Smile Progress...

    10bulls,

    Thanks for the link to that thread, it really got me up to speed!

    Some photos with the progress i've made building the
    controllers and picsteps =)

    Does anyone know the value for C1 on the input board ? 1uF ?

    Raf
    Attached Thumbnails Attached Thumbnails IMGP2769b.jpg   IMGP2770b.jpg  

  4. #4
    Join Date
    Nov 2009
    Posts
    4

    Almost there!

    Much much later I almost have a working setup.

    After fiddling with the acceleration values in Mach3 and setting the stepping mode jumper to full step i managed to blow an LMD, and yes, that was with a proper heatsink attached (not shown in the photos), and the voltage set to 38V.

    I got it replaced and it's working again

    The only problem i have now is when I quickly switch directions while jogging,
    then it doesn't always change direction.. The indicator LEDs however clearly show the DIR signal changing and all my picsteps behave the same.

    Does anyone have an idea why it does this ?

    I'm using the 20Mhz firmware without current reduction.

    Perhaps changing the opto resistors (now at 420R) to a lower value will yield a direction pulse that is a little longer ?


    Some pics attached.
    Attached Thumbnails Attached Thumbnails IMGP2807.jpg   IMGP2803.jpg   IMGP2801.jpg  

  5. #5
    Join Date
    Jan 2009
    Posts
    57

    Pulse width

    Quote Originally Posted by scrat View Post
    Much much later I almost have a working setup.

    After fiddling with the acceleration values in Mach3 and setting the stepping mode jumper to full step i managed to blow an LMD, and yes, that was with a proper heatsink attached (not shown in the photos), and the voltage set to 38V.

    I got it replaced and it's working again

    The only problem i have now is when I quickly switch directions while jogging,
    then it doesn't always change direction.. The indicator LEDs however clearly show the DIR signal changing and all my picsteps behave the same.

    Does anyone have an idea why it does this ?

    I'm using the 20Mhz firmware without current reduction.

    Perhaps changing the opto resistors (now at 420R) to a lower value will yield a direction pulse that is a little longer ?


    Some pics attached.
    Mach3 allows you to set the pulse widths in the configuration. Give that a try first. P.S. Uncluttered work area envy.

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