Hi Guys,
I've gotten an issue that I can't seem to get my head around.:no:
I started to think about making an ER20 collet holder on the Myford lathe, but decided that it would be a good idea to first make sure that the lathe was turning parallel. So I grabbed a 6" inch length of 25 mm bar and relived the middle leaving a 1/2" wide collar at each end then took a skim across both. I also mounted a .001 dial gauge on a magnetic base on the end of the crosslide so that it would be directly above the test piece. Exactly as described in the Myford handbook.
As I expected the free end was about 2 thou smaller than the chuck end. By adjusting the rear, back jacking nut, I got the lathe to turn both collars to the same size. No measurable difference.
Now this is where my quandary starts. Moving the crosslide so that the dial gauge stylus rode onto the top of the test piece collars, I get a consistent 2 thou smaller at the free end. No matter how I adjust the jacking screws, it never changes.
I don't understand why. :no::no::no:
I've gotten an issue that I can't seem to get my head around.:no:
I started to think about making an ER20 collet holder on the Myford lathe, but decided that it would be a good idea to first make sure that the lathe was turning parallel. So I grabbed a 6" inch length of 25 mm bar and relived the middle leaving a 1/2" wide collar at each end then took a skim across both. I also mounted a .001 dial gauge on a magnetic base on the end of the crosslide so that it would be directly above the test piece. Exactly as described in the Myford handbook.
As I expected the free end was about 2 thou smaller than the chuck end. By adjusting the rear, back jacking nut, I got the lathe to turn both collars to the same size. No measurable difference.
Now this is where my quandary starts. Moving the crosslide so that the dial gauge stylus rode onto the top of the test piece collars, I get a consistent 2 thou smaller at the free end. No matter how I adjust the jacking screws, it never changes.
I don't understand why. :no::no::no:
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