Anyone know of a library and sample call to an ACME pipe fitting?
Also, standard NPT would be good too.

If I have a bolt, I can do a difference to get the female part.

I have done a cursory look at openscad libraries that come with it, I
haven't updated in a LONG time. But it is hard to make sense of what and
how to call some of it.

Jerry

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I guess you are able to adapt the following code to your needs. It is
straight forward, but uses itself two libraries, which you have to download.
http://forum.openscad.org/file/n17862/ACME.png

use <skin.scad>      //
https://github.com/openscad/list-comprehension-demos/blob/master/skin.scad
use <naca_sweep.scad> // http://www.thingiverse.com/thing:900137

radius = 16;  // outer radius
threads = 10; // number of threads
helices = 1;  // number of windings
angle = 29;  // open angle
steps = 50;  // resolution

threading(radius, threads, helices, angle, steps);

module threading(r, t, h, a, s)
{  // tricky: we glue two 180° pieces together to get a proper manifold
skin(gen_dat(PI/2h, 180, s, a));  // half screw
rotate([0, 0, 180]) translate([0, 0, PI/2h])
skin(gen_dat(PI/2*h, 180, s, a));  // half screw
}

function gen_dat(h, a, steps, angle) =
let(ang = a>360?360:a, bar = R_(180, -90, 0, Ty_(-radius+1,
vec3D(Rack(threads, angle)))))
[for (i=[0:steps]) Tz_(ih/steps, Rz_(iang/steps, bar))];

function Rack(n=2, angle) =
concat([[0, 2]], [for (i=[0:n-1], j=[0:3])
let(t = [ [0, 1], [2tan(angle/2), -1], [PI/2, -1], [2tan(angle/2)+PI/2,
1]])
[t[j][0]+iPI, t[j][1]]], [[2tan(angle)+PI/2+(n-1)*PI, 2]]);

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