Machinist Calc Pro Thread Size Tables How To Use

Machinist Calc Pro Thread Size Tables How To Use


Now let me show you the thread size key
here on the Machinist Calc Pro. This feature is going to save you hours of tedious thread
table lookups. It’s got more thread data built into it than what you’ll find in the
Machinery Handbook. Let me start with something you know, say
a 1/4 20 the thread pitch. So, starting from here, it tells me that my cut tap is going to
be a size 7, my roll tap is going to be a 5.7
millimeter, the close fit is going to be a size F. My free fit is going to be size H and then
it will give me all my major and minor pitch, diameters and characteristics,
all the way through. Now this is based on a 75% threading
gaugement, which is the default of the calculator. But if you have a material – you want to use
something different. Let’s say we want to go 65%. 65 convert percent thread. Now that’s stored at
65 percent. So now I just go back and start pressing it. There’s our 1/4
20 again. Cut tap is now 4, roll tap is now a 1.
So it’s changed all the sizes and all the characteristics all the way down
through. You can do this for internal as we’ve
just done or external threads. Let me convert this to thread class. Now we’re in
2B. Let’s change that to external class 2A. We’ll use the same size, 1/4 20. There it tells me my rod diameter is going to
be .25. That’s not a surprise. Press again. Cold form is going to be
.2236 and then if I keep pressing it’ll give me all my
major and minor pitch diameters all the way through. Keep in mind that I’ve kept the
65% thread engagement setting in there now. So that’s being
affected by that. The default is 75. So that’s basically an overview
of the thread table functions. For more details you can download our
user’s guide at www.calculated.com/support.

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