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The crosshead began its life as a piece of 3/8" square brass bar. The cap screw boss was machined on the rotary table (Photo 1)A 5C collet held the remaining 1/4" square section in the lathe so that it could be drilled, collared and shouldered on each end. The boss and the end holes were threaded #3-48 (Photo 2).Anthony Mount did his research on the bolt that is used in the boss. It would be so easy to screw in a hardened socket head grub set screw here. Nothing seems to draw in as nicely as with gentle pressure from a hex wrench. But they did not have them in the 1800's. On page 440 of Chas A. Strelinger & Co. 1895 catalog out of Detroit Michigan, clear plates of set and cap screws are shown. They could be square or hex, but I think the square was preferred. If you think of the set screw on top of the tool post on an engine lathe of the time, they were square. And more often than not, catalogues show a square wrench sitting near the lathe.A standard hex headed soft steel bolt was squared to give this look (Photos 3 & 4).
Hi, Are those square socket headed countersunk screws you used to hold the brass blanks together ?? as i have not seen these before unlike the hex type ? and where are they from please....thanks more good work going on there''''''''''Willbert[/quo
Those look like Robertson screws. They are a Canada thing.Tony Thanks Tony yes you are right, no wonder i never have the right screwdriver !!
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