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| Tramming SX2 fixed column milling machine |
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| andyf:
I'm trigonometrically challenged. My round column mill's head can be angled from the vertical, so getting the X axis right is just a matter of patiently tapping with a soft hammer until the DTI doesn't move. But on the Y axis, shims were needed, and I used the method set out here which directly measures the thickness of the required shims. Skip to half-way down page 6. http://rick.sparber.org/TM.pdf In my case, having already fixed the X axis, I only need two marks for the Y, one near the front of the table and one near the back, the distance between them being equal to that between two of the four bolts supporting the column, being a front bolt and a rear one. This showed that the head was nodding forward and 0.05mm/2 thou of shim was needed. I used alumimium foil. This may well creep, but the mill is an old round column one, and the column may not be dead straight. I trammed it with the head at working height for an exacting job, but if the column is not dead straight, it will not remain in tram when a taller or shorter workpiece requires the head to be at a different height, so the exercise may have to be repeated before too long. Andy |
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