Threading Wires

I've been looking on line for a chart which gives data to enable one to cut an imperial thread using wires to check pitch dia. Whether it could be downloaded would be another question. There are charts for Amercan and metric, but I have failed to find any for imperial. There are plenty giving general thread data, but not one for wires. Any chance someone can help me on this one?

Regards Lynne

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This site appears to have all the information, but I haven't used the methods myself.

Brian

https://www.cgtk.co.uk/metalwork/calculators/screwmeasurement

Try,

https://www.cgtk.co.uk/metalwork/calculators/screwmeasurement

Tony

Tony,

Excellent link, thank you.

Jim

A couple of online printed ones to add to your review list:

https://archive.org/details/in.ernet.dli.2015.4765

https://archive.org/details/GTDFactsAboutTapsAndTapping

This site is also good:

https://www.threadcheck.com/the-three-wire-method-of-measuring-pitch-diameter/technicalinfo/

(available as download https://www.threadcheck.com/technical-documents/thread-measuring-wire-formulas.pdf)

https://everbright.com.tw/userdir/56_c.pdf (metric wires for Whitworth form threads)

https://dx.doi.org/10.6028/nbs.lcirc.23r1923 (old, but comprehensive)

The very best source on this is an old Van Keuren catalogue, but you have to buy a paper copy as none are online yet.

For specific thread measurements, drill blanks (available from the likes of Zoro Tools) make serviceable measuring wires. If you did not know already, ArcEuro sell a set of wires.

The 'special sauce' words to go into Google are "whitworth three wire thread measurement".

If anyone wants a home brewed excel spreadsheet that will do the calculations for you (in imperial - but it could be modified to do metric as well, PM me an email address and I'll mail you a copy. I've used it many times as I don't have charts for 55deg threads and its served me well so far. I run it on my phone, so it's to hand when I need it.

Rob

My thanks to you all for your responses. Rob, I will send you a pm with e mail address .Lynne