Marking metal for simple lathe turning
Hello SME-
What would be the appropriate industry standard approach to marking out features while turning a round shaft in a manual lathe? 
After applying layout dye, I have used a hermaphrodite caliper held on the faced off end of the work while the work is rotating at a very slow speed.  It makes a very true and precise scribed line all the way around the project.  
I have seen people take a caliper, (vernier, dial, digital and using the open jaws to do the same.  I would think that this technique would damage the jaws of your caliper making it an inaccurate measuring tool.
Of course you can remove the project from the lathe and mark it using a surface plate scribe/ruler or height gage.

What is the industry standard if any at all or common practice.  Where I work, some people feel using the hermaphrodite on a project while rotating is not common.

Look forward to your opinion or other alternative approaches to this.

Thank you.

Tom Bussi- Kings Point,NY
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