Posted by Oliver 500 Wa on May 24, 2019 at 09:24:04 from (73.96.106.124):
In Reply to: Machining a venturi posted by Fritz Maurer on May 23, 2019 at 20:40:01:
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If you are making the approximate shape with a bunch of different angles off the compound and then blending by hand, how do you check the contour against the original to be sure it is right?
You can try to "eyeball" it, but how close do you think you'll get? Not very.
You could measure diameters at different depths and get a little closer, maybe.
You could cut a template to match the original contour to use to compare the contours. Results will depend on how close you can cut whatever material you choose to use for it.
A sheetmetal template would be best and give the most accuracy, if roughed with a nibbler then ground to finish.
Of course after doing all the above, one would have spent far less time and had a much more accurate reproduction if you just grind a form tool or two.
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