Quote Originally Posted by rossbotics View Post
Hi Marv
with this tool I call a squareness comparator you could only check one side of the machinist square, and that would be the side where the body of the square is pointing away from you, but then you have to check the other side as a reference to the adjacent side, this is where the cylinder square comes into play, there is another way to check your square but not with the squareness comparator, instead of me explaining to you how to do this I attached a video of how to do this operation, this is how we use to it.
Thanks for asking
Doug


https://www.youtube.com/watch?v=baqCWk4OmwU
Yes, the video describes exactly the procedure I've used in the past. Building the little "bridge" to go over the body of the square when the blade is reversed is the nuance that novices may not immediately grasp.

Thanks for finding the video. It will be very helpful for future readers of this thread. I suspect that most of the non-professionals who frequent this forum don't own an expensive cylinder square.