techniques

The real Leigh · Feb 11, 2015

Just read a procedure by Mark Rand for checking squareness of optical mirrors and an autocollimator, here:
http://www.practicalmachinist.com/v...mator-now-what-294402/index4.html#post2485140

I realized that we didn't have a sticky thread for grabbing good ideas and holding them in perpetuity, so...

I'm going to lock this thread to prevent it from turning into a general discussion thread.
If you post or read something that should be included here, please PM me and I'll add a link.

Thanks.

- Leigh

Gordon B. Clarke · Apr 27, 2015

Here's a method for measuring API threads. These have notorious tight pitch diameter tolerances but with care you have a very good idea of where you are.

http://f-m-s.dk/API thread measurement.pdf

OK here's one way to measure external and internal Buttress threads. Makes no difference if the thread is RH or LH.

http://f-m-s.dk/Buttress Thread Measurement.pdf

{merged two posts to get both links in one - TRL}

The real Leigh · Jun 10, 2015

Gordon has done a couple of videos on how to measure pitch diameter.

Here's the first one, on straight threads:

https://www.youtube.com/watch?v=rKqp0o2nK54

Here's the second, on tapered threads:

https://youtu.be/DwwDW5UbGvo

Thanks, Gordon.

- Leigh

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