I was interested in the straight edge, for checking the gantry profile after welding. And as i have nowhere to machine it and havent found around where to do it, i was contemplating checking and filing until is flat. i believe its called " elbow grease " in English.

My idea also was to do the same with Bosch profile i have, as its quite straight. The small triangles i bought as i needed sth really straight as a starting point for all projects.
maybe i am wrong, but how to make a precision machine if i don't have a straight ruler to draw straight line?

Apart from parallel i would like the Y rails / the long ones/ to be straight, not just following each other curvature. Any other way to do this with simple tools like a Bosch profile?


So you say the price is ok?