Turning taper

Turning taper

This topic has 3 replies, 3 voices, and was last updated 19 May 2020 at 00:01 by Hopper.

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18 May 2020 at 22:17 #472807
Alan Gordon 4
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@alangordon4
Hi Guys, I have just acquired a proper Myford cabinet for my S7 After reinstalling the lathe and using a test bar and DTI I adjusted the rear jacking screws to ensure parallel travel, happy days, until I tried to turn a short lenght of steel rod. I took very light cuts but still ended up with a taper. There is no play in the carriage, cross slide or compound slide, any ideas gratefully received.
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18 May 2020 at 22:17 #19756
Alan Gordon 4
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@alangordon4
18 May 2020 at 23:53 #472814
Paul Kemp
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@paulkemp46892
How much taper over what distance on what diameter steel? What is a light cut 0.001" or 0.010"? There could be lots of reasons. Did it turn parallel before in similar circumstances before it was relocated? I take it tailstock support was not used?

Paul.
19 May 2020 at 00:01 #472815
Hopper
Participant
@hopper
The final adjustment is always with a light cut over a test turning piece. Go back and re adjust the base jacking screws on the raising blocks until you get it to turn with no taper.

Static set up with a ground test bar or precision level does not take into account cutting forces and movement due to wear etc etc. Your turning test is the real world moment of truth. The rest is all theory.
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