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need help with X axis after upgrade

dmkmediadmkmedia
in Repetier-Firmware
i had my x axis on a belt drive at 80 steps per mm. now  i have upgraded it to a lead screw drive and i just cant seem to get the settings correct. its an 8mm bar 1.8 step angle and i have tried all micro stepping from 1/8 to 1/32 micro steps i just cant get it correct it either goes too fast and far or too little.
i have used the lead screw calc but that's not the correct setting it says use  2560 on a 1/16 micro-step
anyone any ideas

Comments

  • RepetierRepetier
    2560 Steps per mm for 1/16 is correct for a normal M8 lead screw with 1.25 pitch. I hope yours is higher otherwise printing will be very slow. Especially if using a 8 bit arduino x and y should be < 200 for fast moves.
  • MartinHMartinH
    What type/pitch is your lead screw, a lot of the lead screws on sale are multi start ie 2 or 4 thread ends, so if you have a 4 start 2mm pitch this will equal 8 mm pitch so at 1/16 usteps it will be 400 steps/mm,this will be insanely slow for a x axis.

  • dmkmediadmkmedia
    this is the one i got from amazon

    https://www.amazon.co.uk/gp/product/B06WRN1DQS/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1

    lead of thread(8mm) which is the distance of the nut to rotate a circle.
    Screw diameter: 8mm/0.31".
    Length: 100mm(3.94")/200mm(7.87")/250mm(9.84")/300mm(11.81")/350mm(13.78")/400mm(15.75").
    Screw spacing: 2mm/0.08".
    Lead of thread: 8mm/0.31"
  • RepetierRepetier
    So one motor turn = 200 steps * 16 stubsteps = 3200 Steps
    3200 / 8 (lead) = 400 steps per mm.
  • dmkmediadmkmedia
    spot on working fine thanks
    so if i wanted to go to 32 sub steps would i benefit from it as i do have the ability
  • RepetierRepetier
    Yes you could bit if not using a due based board it will slow down. With avr you are already limited to 100mm/s with this setting since the processor can not handle more steps per second.
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