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Using digital callipers

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Will_D:
I am sure someone else has suggested this but here goes:

Lathe Work 101:
Turning a shaft down to size:

Old Way:
Measure the stock, take a cleaning cut (to round the stock) then measure again.
On a piece of paper: Subtract desired from actual and divide by 2 (depends on your dials!). This is then the amount to remove.
Take more cuts and repeat the above until finished!

New Way:
As most of us use digital callipers:

Round the work as above.
Manually set the callipers to finished size and then zero them.
Apply callipers to work, measure, and divide the reading by 2 – no need for paper!

Ok so this is for getting very close, a precision mike is still the way to go

Manxmodder:
Will D,I have used that method for many years. It's one of the real advantages of digital scales.

Same technique applies for digital micrometers......OZ.

AdeV:
I still use the first method, but that's because I'm usually working in millimetres, and my lathe works in inches...

awemawson:
Getting a DRO on my lathe was 'The Best Thing'. I take a clean up cut to concentricity. Then I take a cut of the doc I expect to use and measure the part. Set the DRO to that value and cut until I have two or three passes left. Once more I measure the part, make any correction necessary to the DRO, and cut to finished size. This way you can take a decent cut as the final cut, which I find advantageous using indexable carbide inserts.

No reason that a digital vernier cannot be used in exactly the same way as my DRO. I have to say I never look at the dials on the lathe, only the DRO !

Will_D:

--- Quote from: AdeV on October 30, 2014, 06:04:47 AM ---I still use the first method, but that's because I'm usually working in millimetres, and my lathe works in inches...

--- End quote ---
So set to say 32 mm manually, zero it, press the ins/mm button, now when you read it the amount to remove will be in inches.

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