The Shop > Tools
Help with alingment of head stock
jb3cx:
Have you tried with the test bar between centres?
Joules:
Blue the taper on your test bar, insert and twist. Now pull it out as gently as you can, pulling it straight so it doesn't bump around in the taper. Look at the contact pattern is it even, you might have to try this a few times. Like wise with blue in the head stock taper you can do again with the test bar clean.
You may already have witness marks on the test bar. If you do have a nick in the taper I would gently scrape it rather than hit it with a reamer.
Take readings along your test bar and rotate the spindle does the 8 thou gradually come in. Clock the spindle outer at the rear of the lathe, any runout.
chipenter:
You can test the test bar using two vee blocks and a dti , any jumps of the needle is a ding that needs stoning off .
lilyies:
Have already done everything suggested so what next boy's.As you might imagine
I am about to tear my hair out.I think it is in the headstock but where??
sparky961:
--- Quote from: lilyies on September 02, 2017, 09:27:31 PM ---It is also telling me there is no taper when I put the indicator on the top of the test bar.
--- End quote ---
Huh? Taper would be tested by running an indicator at 90° or 270°, if designating the top as 0°.
As for the rest of your tests, make sure you aren't inducing error due to indicator "sag" as a function of gravity. You aren't completely clear where you're mounting the indicator and what the tip is contacting.
Don't tear your hair out. Slow down and go back to first principles. Make no assumptions!
Pictures, as always, would probably lend a clue here.
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