Cutting metric threads with an imperial lead screw and a thread dial indicator.

[bearhunter]

Bearhunter you must be referring to Bill Mackereth, didn't know he had passed away. Good guy and like you said , very knowledgeable.

Yup that's his name. I'm sorry I forgot it, but he passed at least 15 or so years ago. He took me to a match at Francois Lake, where people shot at targets appx 1000 yards across the Lake. Do they still do that?

Doping those winds and the mirage was a skill all by itself.

 

[trevj]

I wonder where the settings are hiding? Threading from 4 threads per inch up to 224 threads per inch are visible. The owners manual shows absolutely nothing for metric, no actual gears to change, no 'conversion' to do. The few times I need to thread metric I rent time on a metric lathe.

Please explain how the inch is defined by the metric system. That's a new one for me... On the metric/inch equivalent charts I have - nothing ever matches up to the exactness that would be required for threading.

The "Inch", is actually defined now, as Exactly 25.4mm.

A short time ago, (years) the Inch was defined by a far more complicated decimal fraction.

https://www.britannica.com/science/inch

and

https://en.wikipedia.org/wiki/Inch

On the International Scale, we are stuck with the Inch being defined in a Metric measurement.

Sort of the side effects of being second place winner in a popularity contest!

 

[guntech]

An inch is exactly an inch. I have a micrometer that measures an inch every time I find an inch that needs measuring...

 

[trevj]

An inch is exactly an inch. I have a micrometer that measures an inch every time I find an inch that needs measuring...

Hey, you asked, I answered! LOL!

Pretty much all my measuring equipment is Inch stuff too.

But out there in the width of the wide ol' world, the official standards, that all tools that claim to meet anything traceable, now trace back to an Inch Standard that is legally defined as 25.4mm exactly.