Squareness comparator/surface guage

Started this a while ago, keeps getting out on the back burner due to shop problems and break downs. Still working on my lathe DC drive system that failed...

It's based on Stefan Gotteswinter's project. Did a bunch more mill work last night on the top slide piece.
pro_rom_64.JPG

And my progress so far. IMG_20180221_010118.jpg

To use as a surface guage, I can just spin the top slide around to the back and extend the DTI off the back for about 4" of reach. Not a huge amount of surface covered, but more than I have right now, which is nothing, and my surface plate is small.
I figured with the addition of the surface grinder, and my hopes of making lapping plates, I really need a way to measure squareness and surfaces.

It would be nice to afford a nice reference standard tho. I may just have to rely on comparative squaring. Checking both sides of something and splitting the difference.
 
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H
I will also be doing the radius on the front for the squareness, then swing the indicator around the post to the back side for the surface guage.
 
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H
I'll give that a watch when I have some time this evening.
But, do you not think my positioning would work for both squareness and flatness?
 
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