Unexpected behavior of difference()
Hello !
I am trying to make a screw hole inside a box lid.
The screw hole:
module lid_screw_hole() {
difference() {
color("pink") cylinder(h=14,d=8,center=false);
color("blue") cylinder(h=14,d=6,center=false);
}
}
And the lid:
*module plain_lid() {
translate([box_side-empty_space+10,0,0]) {
color("red") plain_box(box_side-empty_space, box_side, 4);
difference() {
translate([wall,wall,0]) {
color("green") plain_box(box_side-empty_space-(wall*2),
box_side-(wall2), 14);
}
translate([wall2,wall2,0]) {
color("yellow") plain_box(box_side-empty_space-(wall2)2,
box_side-(wall2)2, 14);
}
}
}
}
Naturally, I wanted to make a difference out of these two modules but
something strange happens:
difference() {
plain_lid();
translate([182, wall+2, 0]) lid_screw_hole();
}
</file/t2610/openscad1.png>
Making a union() doesn't help either. It just puts them together with no
actual hole inside the cylinder.
Any thoughts ?
--
Sent from: http://forum.openscad.org/
On 2019-07-22 12:17, GeorgeFlorian wrote:
Any thoughts ?
Your code fragments are incomplete (many variables are undefined), there
is no way to know. Try attaching the complete source.
Carsten Arnholm
Also the picture isn't visible because the forum software is broken at the
moment.
Why are you drilling a hole with a tube and not a cylinder?
The inner cylinder making the tube should be longer than the outer cylinder
to prevent shimmering ends.
On Mon, 22 Jul 2019 at 11:57, arnholm@arnholm.org wrote:
On 2019-07-22 12:17, GeorgeFlorian wrote:
Any thoughts ?
Your code fragments are incomplete (many variables are undefined), there
is no way to know. Try attaching the complete source.
Carsten Arnholm
OpenSCAD mailing list
Discuss@lists.openscad.org
http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org
Here is the picture, you just copy the /file/... part and add it to forum.openscad.org
That is doing what you have told it to do.
Your hole has a d=8 cylinder hollowed out by d=6 cylinder, so you have a tube.
You then difference the tube from the lid. You get a tube 'hole' with the pin in the middle.
-----Original Message-----
From: Discuss [mailto:discuss-bounces@lists.openscad.org] On Behalf Of GeorgeFlorian
Sent: Mon, 22 Jul 2019 20:17
Subject: [OpenSCAD] Unexpected behavior of difference()
Hello !
I am trying to make a screw hole inside a box lid.
The screw hole:
*module lid_screw_hole() {
difference() {
color("pink") cylinder(h=14,d=8,center=false);
color("blue") cylinder(h=14,d=6,center=false);
}
}*
And the lid:
*module plain_lid() {
translate([box_side-empty_space+10,0,0]) {
color("red") plain_box(box_side-empty_space, box_side, 4);
difference() {
translate([wall,wall,0]) {
color("green") plain_box(box_side-empty_space-(wall*2),
box_side-(wall*2), 14);
}
translate([wall*2,wall*2,0]) {
color("yellow") plain_box(box_side-empty_space-(wall*2)*2,
box_side-(wall*2)*2, 14);
}
}
}
}*
Naturally, I wanted to make a difference out of these two modules but
something strange happens:
*difference() {
plain_lid();
translate([182, wall+2, 0]) lid_screw_hole();
}*
</file/t2610/openscad1.png>
Making a union() doesn't help either. It just puts them together with no
actual hole inside the cylinder.
Any thoughts ?
--
Sent from: http://forum.openscad.org/
OpenSCAD mailing list
This email has been checked for viruses by AVG.
https://www.avg.com
Well that picture sort of overwhelmed the forum, resending...
Here is the picture, you just copy the /file/... part and add it to forum.openscad.org
That is doing what you have told it to do.
Your hole has a d=8 cylinder hollowed out by d=6 cylinder, so you have a tube.
You then difference the tube from the lid. You get a tube 'hole' with the pin in the middle.
-----Original Message-----
From: Discuss [mailto:discuss-bounces@lists.openscad.org] On Behalf Of GeorgeFlorian
Sent: Mon, 22 Jul 2019 20:17
Subject: [OpenSCAD] Unexpected behavior of difference()
Hello !
I am trying to make a screw hole inside a box lid.
The screw hole:
*module lid_screw_hole() {
difference() {
color("pink") cylinder(h=14,d=8,center=false);
color("blue") cylinder(h=14,d=6,center=false);
}
}*
And the lid:
*module plain_lid() {
translate([box_side-empty_space+10,0,0]) {
color("red") plain_box(box_side-empty_space, box_side, 4);
difference() {
translate([wall,wall,0]) {
color("green") plain_box(box_side-empty_space-(wall*2),
box_side-(wall*2), 14);
}
translate([wall*2,wall*2,0]) {
color("yellow") plain_box(box_side-empty_space-(wall*2)*2,
box_side-(wall*2)*2, 14);
}
}
}
}*
Naturally, I wanted to make a difference out of these two modules but
something strange happens:
*difference() {
plain_lid();
translate([182, wall+2, 0]) lid_screw_hole();
}*
</file/t2610/openscad1.png>
Making a union() doesn't help either. It just puts them together with no
actual hole inside the cylinder.
Any thoughts ?
--
Sent from: http://forum.openscad.org/
OpenSCAD mailing list
This email has been checked for viruses by AVG.
https://www.avg.com
