Good tooling to measure ones work when making your square:

1 by first principles eg  a 3 4 5 triangle
see https://en.wikipedia.org/wiki/Special_right_triangles

2 buy an engineers square
you want a precision engineers square that is ground and accurate

3 buy an optical square (also used in surveying) and then use a laser pointer.
cheap ish
http://www.ebay.co.uk/itm/Optical-square-Double-Prism-Optical-Square-Builders-square-/161917167969
the proper tool
http://www.ebay.co.uk/itm/Taylor-Hobson-Optical-Square-/262182970682
has a few more uses setting out machines and rotary tables
http://www.ebay.co.uk/itm/Hilger-Watts-Optical-Square-30-Degree-Polygon-TP125-S-No-91335-/161898795565

Dave Caroline

On 15/12/2015, Rafael <[email protected]> wrote:
> I was wondering what is the easiest way to make a T-slot aluminum based
> frame for CNC square?
>
> No matter how good is the cross cut, it  never makes absolutely right
> angle in corners or T sections which causes problems with guide rails etc.
>
> Thanks,
>
> --
> Rafael
>
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