Re: adjustable square for SHS / box sections

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
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