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- Jan 22, 2011
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I would look at weight distribution, since everything seems flat except a single corner. If the location of your vise, or where you are clamping a block down to the table, allows the weight of the table to get off centered, if can make things "fall" into the clearance of the gibs and kick up in a small area.
One test would be to run a DTI over the surface held in the quill and see if it will retrace the surface, but not show any variation from flat. This would be a hint that something is moving. If it does show the dip, then the problem is elsewhere.
I have milled perfectly bowed splines on my BP clone before realizing the part was a bit too heavy in the first place, and certainly long enough and asymmetrical weight-wise and caused the table to moved out of planar.
One test would be to run a DTI over the surface held in the quill and see if it will retrace the surface, but not show any variation from flat. This would be a hint that something is moving. If it does show the dip, then the problem is elsewhere.
I have milled perfectly bowed splines on my BP clone before realizing the part was a bit too heavy in the first place, and certainly long enough and asymmetrical weight-wise and caused the table to moved out of planar.