Quote:
Originally Posted by rally
Neil,
Not sure if your thread profile sketch is just illustrative or intended to be more accurate, but I can see how you would potentially have a lot of problems with those threads, tearing during the turning process would be assured and problems with galling and interference in use !
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Rally, yes it was just a quick and dirty sketch to indicate the general techniques.
If I am in a hurry, I will often start a thread (both internal or external) in the lathe for a few passes, the run a tap or die to get the more correct thread form.
This also helps me keep the tap or die cutting straight and true.
I have also made a few form tools for acme (square) or for very fine threads to get a better root radius.
The crown I finish to dimension, then wet and dry to finish the edges and relieve the fit.
Mark, love your work, envious of your dedication.
There are some projects I would love to tackle;
A tool and cutter grinder, so I do not have grind off hand.
A miniature Aero engine:
The inverted 4 cylinder Gypsy Major as in our Auster and eventually a radial 7 or 9 cylinder. As I said, I envy your dedication as I can see the work involved.
Lots of swarf though
.
Have you seen this Aussie site about miniature IC engines:
http://modelenginenews.org/
Neil