1. #1
    Final finished my mill conversion

    Using original lead screws but with home made Acetal nut on the X and Y axis's

    on the ďZĒ I have fitted a gas strut to counter act the weight of the head but left the pressure slightly high to control the backlash in the original cast iron nut, also adjusted the bevel gear meshing to get its backlash down to a figure that can be controlled by the software.

    All axis's arefitted with 3.1nm stepper motors and timing belts; X = 1:1 Y = 1:1and Z = 2:1
    the motors are driving all axisís at a good feed rate and also cope with fast traversing.

    The drives are set to half steps which give a resolution of 0.005 mm which is fine for my intended use.

    Have fitted limit switches to all axis and am waiting for the emergence stop to arrive from Ebay.

    All the best Steve
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    Last edited by StevenT; 02-11-2014 at 08:25 PM.

  2. #2
    How well are the home made acetal nuts working ? any backlash ? probably need a guard over that belt at the front.

    You should have kept it all in one build thread instead of starting a new one, maybe Lee can combine them ?
    Spelling mistakes are not intentional, I only seem to see them some time after I've posted

  3. #3
    Yes a guard will be fitted in time; backlash X = 0.1, Y= 0.05 and Z = 0.4 (original nut) on each axis with software backlash compensation on i recorded with a DTI repeatability of position X and Y = < 0.01 and Z = < 0.03

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