Test case:

use <agentscad/mx-screw.scad>
use <agentscad/mx-thread.scad>

$fn=36;

difference() {
  union(){
    mxBoltHexagonalThreaded(M5());
    mxNutHexagonalThreaded(M5());
  }
  translate([0, 0, -5]) cube([10, 10, 20]); // x-section
}

I verified it's bolts by 3D-printing both bolt and nut in M3 size and trying to fit those with standard steel ones. Nuts are fine, bolts are not.

When calling libNutHexagonal( p, false, false) or libBoltHexagonal( p, false, false) nut or bolt-head disappear.
My fix is:
module libBevelShape( l, d, a=BEVEL_HEXA_A, b=true, t=true ) {
h = (d/2)*tan(a);
r = (l+h)/tan(a);
intersection() {
if ( t ) {
translate([0,0,-l/2])
cylinder( r1=r, r2=0, h=(l+h) );
}
if ( b ) {
translate([0,0,-h-l/2])
cylinder( r1=0, r2=r, h=(l+h) );
}
//new
if ( (!t) && (!b) ) {
cylinder( r1=r, r2=r, h=l, center=true );
}
}
}

The following code (from the tutorials) sometimes does not render the threaded part of the bolts. The console shows a "mesh not closed" error:

use <agentscad/mx-screw.scad>
use <agentscad/mx-thread.scad>


// M6 bolt with 10mm thread length
$fn=50;
screw  = M6();
mxBoltHexagonalThreaded(screw,10);

translate([50, 0, 0])
  mxBoltAllenThreaded(screw,20);

screenshot of the preview:

screenshot of the render:

hey and thanks for sharing your awesome library.

It is not possible to use it though without having your specific local directory setup and other files referenced.

For example in this file:
agentscad/snap-joint.scad

There are several "use" calls to files that are not a git submodule and not part of this repository:

use <scad-utils/lists.scad>
use <scad-utils/transformations.scad>
use <agentscad/extensions.scad>
use <agentscad/printing.scad>
use <list-comprehension-dems/sweep.scad>

Cloning your scad-utils and moving some files to ./agentscad does help.
But the "sweep.scad" is calling in more files that I dont know where to find.

Could you provide the whole thing?
So that you can just clone / download in a new directory and it will run in openscad.

Hi! Love this item - so useful!

Seems that the HEIGHT parameter stops having effect beyond 20/30. Any reason why?

The cap seems to grow but not the knob.

Thanks for looking!
Cheers
Mike

on the wiki for screws:

https://github.com/GillesBouissac/agentscad/wiki/Screws-shapes

these links are broken links:

Direct access to the code of the tutorial for each standard:

    [Metric Coarse tutorial code](https://github.com/GillesBouissac/agentscad/blob/master/test/test-mx-screw-tutorial.scad)
    [Metric Fine tutorial code](https://github.com/GillesBouissac/agentscad/blob/master/test/test-mxf-screw-tutorial.scad)
    [UNC tutorial code](https://github.com/GillesBouissac/agentscad/blob/master/test/test-unc-screw-tutorial.scad)
    [UNF tutorial code](https://github.com/GillesBouissac/agentscad/blob/master/test/test-unf-screw-tutorial.scad)
    [BSW tutorial code](https://github.com/GillesBouissac/agentscad/blob/master/test/test-bsw-screw-tutorial.scad)
    [BSF tutorial code](https://github.com/GillesBouissac/agentscad/blob/master/test/test-bsf-screw-tutorial.scad)

because these files are in a screws subfolder:

https://github.com/GillesBouissac/agentscad/tree/master/test/screws

I would submit a PR for this, but it does not look like GitHub supports PRs for wiki. Please let me know if I can help with this.

Good day, i am totally new to 3d printing and openscad! i would like to know how i use the files etc please? i am wanting to print some BSW threads to aid my rebuild on my old car.
many thanks

chris

...

Ah -- I see it is from hirthJointProfileRectangle()

and

as explained here:

#2 (comment)

...so setting $gap would control the slop:

use <agentscad/hirth-joint.scad> // https://github.com/GillesBouissac/agentscad

MARGIN = 0.2;

$gap = 0.0;

module testHirthPair(){     
    difference() {
        union() {
            hirthJointRectangle( 5, 11, 1, 1, 1, shift=0.5 );
            translate( [0,0,3+0.01] )
            rotate([0,180,0])
                hirthJointRectangle( 5, 11, 1, 1, 1, shift=0.5 );
        }
        cylinder(r=2.5,h=10, center=true);
    }
}

testHirthPair();

with the following code:

use <agentscad/mx-screw.scad>
use <agentscad/mx-thread.scad>

$fn=50;
screw  = M3(tl=2);
translate([0, 0, -.001])
  mxBoltAllenThreaded(screw,10);

I am expecting to generate an M3 screw, which should have an external diameter of 3mm, but rendering shows a screw whose diameter is closer to 2*1.35mm (2.7mm):

is this a tolerance for printing?I would like to be able to adjust it because this is in fact too small to catch threads of metal nuts.