School shop built C-clamp still doing the job for over 50 years. I was raised on the farm and heavily involved in welding and machinery repair The easy answer to why all of our clamps were twisted and sprung, would probably be they were not built for the severe service they were subjected to. So when I had a chance to build a C-clamp in a machine shop class, I went big and strong.
Cross-hatch pad was done on a shaper.
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The selection of material at hand in our shop , was a factor in the clamps design. The main threaded rod is 1 3/8 , This would become a problem when cutting the internal nut thread since it limited the boring bar size to 3/4 of an inch. This along with the long overhang of the bar, because of the nuts length , required the threading to be done with very small cuts.
There is a square pocket through the center of the section. A square spud enables the c-clamp to be mounted on welding table, and being held vertically.
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In the picture below, a 3/4 thick angle iron is bent down, ready to be welded. This is my latest project, Putting a D-2 Cat engine in a 70 John Deere Think I will call it- "My Deere Cat ".
