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From: "Jim Wilkins" <muratlanne@gmail.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: adjustable square for SHS / box sections
Date: Mon, 10 Feb 2025 17:30:28 -0500
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"Richard Smith"  wrote in message news:m1pljpv8pk.fsf@void.com...

Hi all - update Monday 10 February 2025  20:29

I found some Ali extruded angle, hence sharp inside corner.
Trimmed one side to give 25mm down side of from surface the angle si
resting on.
Took a bit of fiddling and measuring, but once made, blessing.
Then my two adjustable squares went to mark in the length direction
where the holes go.
Every indication is it's very consistent and is accurate.

The important things are
* that the holes on opposite sides line-up
* that the holes at at specified centres.
All others are significantly less critical.

With the angle "measure" having chalked one side I spun the angle
around so it sat on the same "top face" but extended down the other
side.

The method mentioned seems to meet the requirements.

--------------------------------
The test is to use it to draw all the way around and see if the start and 
end meet.