Hi,
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I¡¯m using a test bar in the head stock taper¡.
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I have polished the inside of the spindle and removed any traces of dirt, Then I removed the run out at the far end of the bar by hand lapping the test bar off of the machine being careful to mark the high spots with dye!
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I then carried on until I had .001mm - .002 run out at the long end - so I know the bar is good?
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Then using the carriage with the dti trammed the bar and found the error !!
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(Left to right error)
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I haven¡¯t checked vertical just yet¡
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Cheers Rick
