Re: adjustable square for SHS / box sections

On 2/8/2025 5:56 AM, Snag wrote:

On 2/8/2025 12:06 AM, Richard Smith wrote:

Hi all
>
Working with
Rectangular Hollow Sections
Square Hollow Sections
box sections
...
>
The rounded corners make using an adjustable square / sliding square
problematic.
>
Given number of machine parts I have to make quite accurately based on
SHS's, thinking of a tool specially optimised for marking distances
from the surfaces.
ie. whatever presents as "top", slide along marking down the "sides".
Typically the middle of the "sides".
>
Accuracy - well using a chalk / soapstone is plenty good enough.
Have to bring magnetic-base drill to the job most of the time, and
with using a shell-cutter / trepanning cutter with a central "pin" to
locate on the centre-pop - accuracy there is less than chalking gives.
So - would hold thing in place and chalk-mark.
>
I could trim offcuts of angle-iron to make single-dimension tools -
eg. marks 25mm from "top" surface.
Advantage with this or "settable" tool is spin around 180deg and mark
the other "side" and the two heights/levels should match-up.
>
Hope described this well enough.
>
Best wishes
>

    I've seen combination squares with a wide flange on the head that will do what you want . Here's a link to one on Amazon , kinda pricey but you might be able to find one cheaper .
 https://primeweld.com/products/lagesse-products-lasquare-12-combination- square-stainless-steel-blade-aluminum-square-head

Exactly what I was thinking of.  Might even be able to swap out to a longer scale if needed.  I had (maybe still have somewhere) a combination square with an 18 inch scale.
--
Bob La Londe
CNC Molds N Stuff
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