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  1. 04-05-2019 #8
    pippin88's Avatar
    Lives in Newcastle, Australia.
    pippin88
    Last Activity: 1 Week Ago Has been a member for 9-10 years. Has a total post count of 100. Received thanks 11 times, giving thanks to others 1 times. Referred 1 members to the community.
    Quote Originally Posted by Crunch View Post
    Thank you for advice,
    how big is your machine ?
    what size pitch and ball screws you using to move gantry, have you used pulleys, if so what ratio.?

    Regards Paul
    Gantry span 1300mm.
    15mm pitch screws. 15mm diameter I think. They are secondhand ground screws.
    I use 16mm pitch 16mm diameter screws on other axes (from BST automation).

    No pulleys.

    Steppers are best used with high pitch screws (10mm or more) not 5mm pitch screws. Steppers have max torque at 0rpm and it falls as rpm rise.

    Servos are different. They are rated for torque at rated rpm (often 3000rpm).
    Last edited by pippin88; 04-05-2019 at 01:09 AM.
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