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Thread: Milling CNC Kit

  1. #16
    Join Date
    Nov 2019
    Location
    Canada
    Posts
    14

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    The mh28 looks almost identical to the G0704. As such, the general conversion scheme should be the same. The specs I found indicate that it is a tad bigger than the G0704 so you will have to adjust dimensions a bit, but stepper sizes and such should work fine.

  2. #17
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,439

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    Hi Guys,

    As some may know, I have a BF20L mill. One of the issues with it is that the square cross section column has most of one face removed and dovetails down each side. The head is carried on a bracket that slides in the gap created on one face of the column and is raised and lowered by a screw inside the column. The bracket is not a good fit in that gap and relies upon the dovetails guiding the head to keep everything square.

    The problem that arises is the locks for the head bear on the gibb strip on the right hand side looking from the front of the mill. When the locks are tightened the square column casting compresses and twists the head slightly out of tram. This leaves the column very slightly curved and the dovetails curve with it. This causes the head tram to vary with hight up the column. A side effect of this is the column will twist under a too heavy a cut, this can be seen as the head shaking from side to side.

    The real cure for this is to make the head bracket a good fit in the gap and stop the column from flexing. However it would also make the head harder to move since it would be tighter in the middle and loose at the top and bottom.

    I don't see any answer for this problem without a major redesign of the column and head hight adjustment mechanism.
    Best Regards:
    Baron J.

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