these days tin dies are about 4" dia, these days we know how to do lots of stuff we knew how to differently long ago.
or they could be machining tires for trains.....
Contouring lathe with electronic follower. Carnegie-Illinois Steel Corporation. Homestead, PA 1953.
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Expanding the view reveals the tracer pattern, lower left of machinist's feet. The V has an involute-like form, so the stylus is radiused; smaller than where they converge, fillet where they meet parallel sides, and where those meet outer diameter. Many tracers are hydraulic only, depth controlled by crossfeed, first passes
don't create full contour. In mill profiling the cutter is most often ball end. Lathe work then, works likewise, with a radiused tip bit, either case is to scale of pattern and stylus. Roughing was accomplished by changing stylus or cutter size accordingly, as most patterns were 1:1, but ratios work too.
Since parting is still profiling, it's not uncommon to chamfer edges with same cutter before depth gets too far along, using the compound. best results are when [you guessed correctly] parting tool has small corner radii and square face.
...we'll learn more by wandering than searching...
Reconditioning a 12,000 ton press. United States Steel Corporation. 1944.
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I remember those guys. we did have one machine that stayed covered in cast iron shavings.it pissed off the boss when he saw it ,till I explaned to him that is I leave the shavings there the machine wont rust...if I remove them it will...then I told him I clean it almost every day.as I was cleaning it before every use. when I left there after about 2o years that machine still looked good.a few months lator it was not quite the same..and somewhat. I miss running that shop...well I miss the equipment.
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