Thread: Over what angle does a screw thread go from zero height to the specified height?

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Over what angle does a screw thread go from zero height to the specified height?

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Ken

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It seems you should be able to figure that out based on the pitch and lead of the screw thread. The pitch is the distance between a point on one thread and the same point on an adjacent thread. On imperial threads, you divide 1 by the threads per inch to get pitch, so 20 TPI would be 1/20 or .050". On metric threads, the second number in the thread designation is the pitch, for instance M6 x 1.0, the major diameter is 6mm and the pitch is 1mm.

The lead is the distance a thread travels in one rotation of the screw. On single start threads, pitch and lead will be the same. On double start threads, the lead will be twice the pitch, triple start will be three times pitch, etc. It should be just math after that. I hope this helps.

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In short, no it does not make sense at all. What kind of engineer are you that you find a "height" in a thread?
Threads have major and minor diameters, pitches, angles, forms , and starts. Possibly more such measurements but they don't have a "height".

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Last edited by Toolguy; 01-19-2011 at 11:58 AM.

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Originally Posted by tdmidget
In short, no it does not make sense at all. What kind of engineer are you that you find a "height" in a thread?
Threads have major and minor diameters, pitches, angles, forms , and starts. Possibly more such measurements but they don't have a "height".
Electrical?

David

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angle

The angle that you are asking about is 30degrees. From root to tip. The rest depends on TPI and diameter. At least that is what I think you are asking,

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tdmidget,
nice going
there are more then one kind of engineer, not all of them are mechanical. But You must missed that one in grammar School.
h12721

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For some reason, I started worrying about safety of our marines.

Jokes aside, Rookie, maybe you want to post a sketch illustrating your inquiry?

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Toolguy's reply is, IMO, correct. And what he asked about perpendicular or parallel is exactly the "confusing" part of the question since visually it could be either and a bit different approach though between the rest of the replies answered pretty much too.

Am I correct in thinking you are interested in if these threaded parts are made separately, as opposed to drilling as a unit, when those holes will align?
Or, perhaps more to the point, if they are first drilled as a unit and then disassembled for later reassembly at what point will those holes line up?
To me, given what you have said (the why in your question), it could act as a simple "timing" device with a few other bits and pieces.

Or it could be a very complicated way to safety wire some parts.

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