I think, or I understood, that these are buttons on external extra
inputdevices

Michael, fra mobilen

tir. 8. jun. 2021 18.10 skrev lar3ry lar3ry@sasktel.net:

lar3ry wrote

I'm not sure about documentation, but you can start with gory details at:
https://github.com/openscad/openscad/pull/2130

OpenSCAD Admin - email* me if you need anything,  or if I've done something stupid...

• on the Forum, click on my MichaelAtOz label, there is a link to email me.

Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above.

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Sent from: http://forum.openscad.org/

When I do this (and I've made quite a few adapters for the vacuums in my
shop) I use differences between three cylinders:

//Adapter from Festool vacuum to DeWalt table saw

$fn = 100;
inches = 25.4;
rch = 0.4;            // clearance
di = 57.3;
th = 3;
// DeWalt table saw
hd = 35;    // DeWalt height
dd = 64.6;    // DeWalt ID
// vacuum
hv = 60;    // vacuum height
dv = 55.6;    // vacuum ID
// transition
ht = dd - dv;    // transition height

// Rikon bandsaw
difference() {
    cylinder(h = hd, d = dd + 2 * th);
    translate([0, 0, -0.1])
        cylinder(h = hd + 1, d = dd + rch);
    }

// transition
translate([0, 0, hd])
    difference() {
        cylinder(h = ht, d1 = dd + 2 * th, d2 = dv + 2 * th);
        translate([0, 0, -0.1])
            cylinder(h = ht + 1, d1 = dd + rch, d2 = dv);
        }

// vacuum
translate([0, 0, hd + ht])
    difference() {
        cylinder(h = hv, d = dv + 2 * th);
        translate([0, 0, -0.1])
            cylinder(h = hv + 1, d = dv + rch);
        }

On 6/15/2021 9:38 AM, Karl Exler wrote:

That piece of code misses one point (or the point list is too long by one).
You do not need the point list if it is just 0,1,2,3 .. it assumes that.

Offset is a transformation, like size(). You could take that polygon and do
offset() on it, and then take the original and difference() on it, but then
you need to fudge something because you would get a hollow item, but closed
at both ends. And you need to specify the polygon twice (make a module, or
just store the vector list in a variable ...
OR
You draw the cross section, ie a polygon that traces the outside and inside.

The solution of doing it with cylinders is simpler, at least for this type
of shape.

On Tue, 15 Jun 2021 at 15:38, Karl Exler karl.exler@meinklang.cc wrote:

In this case offset is not a good idea. You want the offset in x direction.
But you get a lot of 'waste' in the 3 other directions too. Maybe with
difference() and scale() or resize()?
I (I'm a bad script-thinker) do this usually in Inkscape (see att.):
In Inkscape I set everything to 'mm' and take the bottom left corner as the
origin.
Now you can draw one wall and save it in the same folder as your scad file

• that's it for inkscape and in OpenSCAD you just
  rotate_extrude() import("karls.svg");
  ..done.

thanks a lot to all, who supported me and all others making adapter for
vakuum-system...

And the winner iiiiis: DPA

Why not cooperate Inkscape and openscape?
Making a model in Inkscape is really easy. Positions and length can
easily be done by typing. And the rest in Openscad is

rotate_extrude() import("karls.svg");

quick, accurate, wonderful

Why:

• shortest code
• though using two programs highest possible accuracy

Am 16.06.21 um 12:07 schrieb dpa: