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  1. 18-10-2011 #1
    cooliced's Avatar
    Lives in Lincolnshire, United Kingdom.
    cooliced
    Last Activity: 19-04-2017 Has been a member for 9-10 years. Has a total post count of 144.
    my motors are set to 320 steps per mm
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  2. 18-10-2011 #2
    Jonathan's Avatar
    Lives in Leicester (Home) or Nottingham University (2nd Home), United Kingdom.
    Jonathan
    Last Activity: 05-04-2020 Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 3,571. Received thanks 325 times, giving thanks to others 8 times. Referred 1 members to the community.
    If it is indeed 5TPI screws then you should set the motor steps per revolution to 314.9606:

    You say 320 step/mm and 5mm pitch, so 5*320=1600 step/rev. That implies your motors are set to 1/8 microstep... 5TPI is 25.4/5=5.08mm. So 1600/5.08=314.96... step/mm.

    Try that and measure it over a greater distance. What are you using to measure the travel?
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