Quote Originally Posted by tonyfoale View Post
I am normally like you regarding watching the videos posted on HMT forum but this one caught my attention because of the apparent similarity to what I plan for my surface grinder, and I watched by jumping along until there was a change in the picture. i did happen upon a section where he remeasured the alignment of the slides and there was a 5 thou vertical bend which he related to a small temperature change between that measurement and the same measurement when he aligned the slides. He then put a sample of epoxy granite in a freezer and measured it cold and room temperature and calculated the coefficient. I forget the value but it was much higher than steel, this can only occur if his resin content was excessive. It is a pity because it is one of the nicest lathe builds that I have seen here in stark contrast to a few of the recent offerings which are just plain crap.
That makes me wonder if it might not have been fully cured or if it should have been aged for a while even after curing before further processing.
I'm not all that familiar the granite epoxy composite, but I have had fiberglass repairs creep due to shrinkage after they aged a while