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Using a Dog Leg Pointer and feeler gauges to Square up a Mill
After all these modifications I needed to square up the head on this tiny cnc. I couldn't use a DTi as it was just too big to fit. So I resorted back to the old fashioned method of using a dog-leg pointer and some feeler gauges.
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The point was machined onto the bar before I then bent it to shape. The shape doesn't have to be perfect. It's made from 1/8" mild steel.
The length of the leg is around 1.25" and so the total span side to side is 2.5" - that combined with a 1 thou feeler gauge gets the head very square.
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Just then rotate front to back and get the heights exactly the same, then do left to right.
You could use this method to square up the head on a milling machine or pillar drill.