Presumably as it's a parallel not a straight edge, it would be fully supported by a machine table when it's in use?
Because it’s a very strong structure and cast iron doesn’t like to flex. Everything is plastic but cast iron is one of the least plastic
I doubt it will flex significantly more than a fish back, it's an "I" beam, probably heavier than a fish back. I have a 72inch one this shape that I checked on the diagonal of my 36"x36" surface plate, over 49" or 1.25m the sag was less than1/100mm, under 4/10 of a thou. for scraping a lathe bed, that's acceptable for me! By the way, my 72" straight edge weighs 40kgs! Cheers, Matthew
There shouldn’t be sag as I’m guessing 49” support points should have been very close to the airy points. 40kg isn’t too bad my windley bros 72” fishback has got to be 70kg plus!
It's supported well outside the Airy points! I compared the difference between the straight edge lying flat on the surface plate and raised up at the extremities with blocks. 1/100mm is OK. I know the weight of my straight edge is 40kgs as it was weighed transport, it's a bear to wield single handed!
Squares all fettled waiting for machining . Foundry properly pulled my trousers down on these. There again they would be 1000s from Taft pierce or windley
Very nice. I picked 2x 2’ high squares off ebay about 10yrs ago. He messed up and put £40 buy it now, instead of starting bid.. cast aluminium with a steel face with tee slot, so not as nice as yours. But easier to pickup
Those are absolutely beautiful Are they cost effective to sell, then? I couldn't justify it, I don't have the need... but someone surely will!
