Posted by unc on May 23, 2019 at 21:52:49 from (69.168.162.41):
In Reply to: Machining a venturi posted by Fritz Maurer on May 23, 2019 at 20:40:01:
Fritz: For a one-off piece, you can fiddle with it a little. I'd use your compound with several settings to get the radius as close as you can, and then, as the previous poster suggested, use a ground form tool to eliminate the corners left by this process-OR- knock off the corners with your handy-dandy three corner scraper made from an old triangular file. Use low speed, and check your progress often. When it looks about right, mike your final bore at the venturi, and give it a polish. I think you might be surprised at how easily a scraper will smooth out the surface.
The Marvel Schebler venturis were made from spun or stamped brass- not a terribly accurate process. A lathe turned venturi will probably be more accurate than the factory job. unc
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