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  1. #1
    You draw your part in CAD then create a Gcode file using a CAM program

    The attached pic is drawn in the lower R/H corner this is X Plus Y Minus

    The piece is 100 mm square and you want to put a 20mm hole in the centre

    This assume your machine is perfectly set up, no backlash etc

    You only have simple equipment no edge finders of any type

    You will hold this in a vice clamped to the table with the back edge running perfectly parallel to the X axis

    Have the part stick out say 10mm on the left hand side

    You can use a dowel of 6mm dia or a cutter mounted in your collet upside down

    Bring the dowel up on the left hand side so it is just touching you can use a feeler gauge to do this but you have to add the feeler gauge thickness to the DRO's setting

    Once you have TOUCHED OFF set the DRO to the correct dimension then raise the Z and move the table to Zero it should be obvious if the dowel looks correctly on the centreline

    Then you repeat for the other axis

    Using this method you should be able to be accurate to 0.02mm

    You could also have other holes, recesses shapes in the plate but the edge finding is the same



    HTH
    Phil
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by M250cnc; 09-01-2011 at 03:11 PM.

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