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On Sun, 11 Jun 1995, Eric Maiken wrote: > as a machinist, i assert that this would be trivial to impliment in > either CNC or manual enviornments (i cut 300 Bar right hand threads > routinely). all of the tooling that supports building conventional matings > would still be used--only the thread cut would be reversed. > > because there is no difference in the mechanical integrity of lh and rh > thread, the regulators should have no basis for rejecting implimentation. When I worked in a machine shop, we had taps and dies for all right hand thread sizes we commonly worked with. Left hand thread items (all of them) had to be cut on a lathe. This probably presents no problems for manufacturing lines, they would simply have a supply of left hand taps and dies for 300 BAR DIN made up. But for machining special adapters, I suspect you've raised the bar, (as it were) unless there are no taps and dies for 300 bar DIN thread available at all, and all of these threads are cut on lathes. Lathing asymetrical objects, such as tank valves, might well prove to be somewhat difficult. Nick Simicich - njs@sc*.em*.ne* - (last choice) njs@bc*.vn*.ib*.co* http://scifi.emi.net/njs.html -- Stop by and Light Up The World!
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