Measuring Thread with a single wire.

[rzw0wr]

I was told by my machinist son in law to use a small rubber band on the bottom 2 wires.

I haven't tried it yet.

 

[stupoty]

The cheep wire set i have came with some handy rubber / plastic things to hold two of them on the end of the micrometer , it works quite well.

Stu

 

[Paul in OKC]

I use these. Work great.

FLEXBAR 16707 .018

BenefitsAn accurate and inexpensive way to check threads.Makes thread triangles, thread Micrometers and all other current methods obsolete.ApplicationsAs easy as selecting the proper wire sizes, matching the wire size with the proper P.D. Check, slipping two wires into the holder, placing the...

www.travers.com

 

[Scra99tch]

I use these. Work great.

FLEXBAR 16707 .018

BenefitsAn accurate and inexpensive way to check threads.Makes thread triangles, thread Micrometers and all other current methods obsolete.ApplicationsAs easy as selecting the proper wire sizes, matching the wire size with the proper P.D. Check, slipping two wires into the holder, placing the...

www.travers.com

Yeah was going to 3d print some of these at some point.

 

[pstemari]

I worked out a procedure to measure thread pitch diameter with a single wire. I basically involves measuring the O..D of the thread and measuring the diameter plus a wire.

Twice the diameter over a single thread wire minus the measured major diameter should give you the same reading as a 3 wire measurement.

That said, if it was really that simple to get a reliable measurement, I would have expected the method to be published widely five decades ago. The only potential issues I can think of are burrs on the threads and non-concentricity of the threads with the major diameter.

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