42 mm Thread optic data
42 mm Thread optic data
(OP)
need info on ID thread major, minor, pitch, for 42mm thread and TPI
Thanks for you help
Thanks for you help
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RE: 42 mm Thread optic data
You can calculate the major, minor and pitch diameters using formulas in the "Metric Screw Threads - M Profile" section of the Machinery's Handbook (p. 1531 in my 23rd ed.). There are also tables to calculate your tolerances based on what grade of accuracy you require, length of engagement, etc.
If it is indeed for a 35mm camera then I would guess that you don't need a very fine tolerance grade, since concentricity doesn't usually matter much when you're just positioning an image onto film (or a CCD). Light leakage is not a problem either, since light is extremely easy to seal out (it can't easily go around a corner). It doesn't need to be liquid tight.
If it is for an application where the light image passes on to another lens, then you will need to choose a tolerance grade that ensures sufficient concentricity between the lenses.
Hope this helps.
Don
Kansas City
RE: 42 mm Thread optic data
Jim
RE: 42 mm Thread optic data
So the dimensions would be as follows:
M42 x .75
Major dia. = 42.02/42.30
Pitch dia. = 41.53/41.70
Minor dia. = 41.21/41.44
Good luck.
Don
Kansas City