Re: Tangential join/infill two parallel vertical cylindrical tubes.
The cutting cylinders need to be longer than the object they cut, not the
precise right size, or you'll have problems with your model. Just make them
silly long.
OpenSCAD mailing list-2 wrote
AdrianV, Ray West, Troberg
Thanks for all your suggestions! :-) I now understand at least two new
ways of reaching my goal; hull, linear_extrude and mirror. Just need to
focus on the maths now. The vertical offset was left over from some tests
I did and shouldn't have been in the original code but I've put it in to
the Hull based model now, added an additional horizontal spacing between
the vertical cylinder centres (to allow swing room for the arm) and am now
trying to work out the maths to ensure that the cylinders that cut the
holes are the right length. Yes, I could make them silly long so they
definitely cut right through but its all part of the challenge. Thanks,
all, for your ideas.
Chris
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Today's Topics:
1. Tangential join/infill two parallel vertical cylindrical tubes.
(Chris Johnson)
2. Re: Tangential join/infill two parallel vertical cylindrical tubes.
(adrianv)
3. Re: Tangential join/infill two parallel vertical cylindrical tubes.
(Ray West)
4. Re: Tangential join/infill two parallel vertical cylindrical tubes.
(Troberg)
5. Meassuerments workarround (Karl Exler)
Message: 1
Date: Mon, 19 Apr 2021 23:49:30 +0100
From: Chris Johnson <
cjohnsonuk@
>
Subject: [OpenSCAD] Tangential join/infill two parallel vertical
cylindrical tubes.
To:
discuss@.openscad
Message-ID:
<
CAEC-mOHVaTRPgwY00+Pv+92swrAv+uRCgFW4SbXign8LPno5vg@.gmail
Content-Type: multipart/alternative;
boundary="000000000000b02fc605c05b2694"
I have 2 parallel vertical cylinders with different diameters that are
adjacent and touching. I want to fill the space 'between' the cylinders
to
join them securely. I did think about creating a polygon block that I
join
with the two cylinders before taking the inner cylinders away to make a
straight edge join but I thought this is a simple enough model to learn
how
to use the roundanything library to create a fill with a radius of my
choosing. However , being a noob, Not sure where to start.
back story: The larger cylinder fits over my monitor stand. The smaller
Cylinder is for an anglepoise arm for a webcam/ video light. I just need
to be able to join them nicely so that they don't break apart.
Here's what I've got so far.:
include <Round-Anything/MinkowskiRound.scad>;
$fn=10;
br=32;
sr=12.3;
bw=5;
sw=4;
height=12;
boundingEnvelope=[50,50,50];
OR=0.7;
IR=1;
enable=1;
minkowskiRound(OR, IR, enable, boundingEnvelope) {
union(){
translate([0,0,-10]){
difference(){
cylinder (height,br+bw,br+bw,center=true);
cylinder (height+2,br,br,center=true);
}
translate([br+sr+sw+bw,0,0]){
difference(){
cylinder (height,sr+sw,sr+sw,center=true);
cylinder (height+2,sr,sr,center=true);
}
}
}
}
}
But I just get a spinning circle on my Mac.
not sure how the bounding envelope works or how long I should expect to
wait for a result.
Any help appreciated:
Chris Johnson
If you do a 2d drawing of the extrusion profile, and extrude, you have
no problem wrt the length of the hole. The example I previously posted,
a separation value can be added, and modify each translation value for
x in the modules (and also the 'wedge polygon). If you are fussy about
the tangent, then you could remove (or not bother) the 'filler' module,
and its references, and replace the code after the '$fn=80;' by
difference(){
hull(){
linear_extrude(height)
skin();
}
translate([0,0,-height])linear_extrude(height*3)holes();
}
you need longer holes in 3d if you want to be sure that' it knows the
holes go right through', and making them three times longer and
translating back one length, is the easiest.
On 20/04/2021 11:54, adrianv wrote:
The cutting cylinders need to be longer than the object they cut,
not the precise right size, or you'll have problems with your model.
Just make them silly long.
OpenSCAD mailing list-2 wrote
AdrianV, Ray West, Troberg
Thanks for all your suggestions! :-) I now understand at least
two new
ways of reaching my goal; hull, linear_extrude and mirror. Just
need to
focus on the maths now. The vertical offset was left over from
some tests
I did and shouldn't have been in the original code but I've put it
in to
the Hull based model now, added an additional horizontal spacing
between
the vertical cylinder centres (to allow swing room for the arm)
and am now
trying to work out the maths to ensure that the cylinders that cut
the
holes are the right length. Yes, I could make them silly long so
they
definitely cut right through but its all part of the challenge.
Thanks,
all, for your ideas.
Chris
On Tue, 20 Apr 2021 at 08:36, <[hidden email]
</user/SendEmail.jtp?type=email&email=discuss-request%40.openscad>>
wrote:
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When replying, please edit your Subject line so it is more specific
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Today's Topics:
1. Tangential join/infill two parallel vertical cylindrical
tubes.
(Chris Johnson)
2. Re: Tangential join/infill two parallel vertical
cylindrical tubes.
(adrianv)
3. Re: Tangential join/infill two parallel vertical
cylindrical tubes.
(Ray West)
4. Re: Tangential join/infill two parallel vertical
cylindrical tubes.
(Troberg)
5. Meassuerments workarround (Karl Exler)
----------------------------------------------------------------------
Message: 1
Date: Mon, 19 Apr 2021 23:49:30 +0100
From: Chris Johnson <[hidden email]
</user/SendEmail.jtp?type=email&email=cjohnsonuk%40>>
Subject: [OpenSCAD] Tangential join/infill two parallel vertical
cylindrical tubes.
To: [hidden email]
</user/SendEmail.jtp?type=email&email=discuss%40.openscad>
Message-ID:
<
[hidden email]
</user/SendEmail.jtp?type=email&email=CAEC-mOHVaTRPgwY00%2BPv%2B92swrAv%2BuRCgFW4SbXign8LPno5vg%40.gmail>>
Content-Type: multipart/alternative;
boundary="000000000000b02fc605c05b2694"
I have 2 parallel vertical cylinders with different diameters
that are
adjacent and touching. I want to fill the space 'between' the
cylinders to
join them securely. I did think about creating a polygon block
that I join
with the two cylinders before taking the inner cylinders away to
make a
straight edge join but I thought this is a simple enough model
to learn how
to use the roundanything library to create a fill with a radius
of my
choosing. However , being a noob, Not sure where to start.
back story: The larger cylinder fits over my monitor stand. The
smaller
Cylinder is for an anglepoise arm for a webcam/ video light. I
just need
to be able to join them nicely so that they don't break apart.
Here's what I've got so far.:
include <Round-Anything/MinkowskiRound.scad>;
$fn=10;
br=32;
sr=12.3;
bw=5;
sw=4;
height=12;
boundingEnvelope=[50,50,50];
OR=0.7;
IR=1;
enable=1;
minkowskiRound(OR, IR, enable, boundingEnvelope) {
union(){
translate([0,0,-10]){
difference(){
cylinder (height,br+bw,br+bw,center=true);
cylinder (height+2,br,br,center=true);
}
translate([br+sr+sw+bw,0,0]){
difference(){
cylinder (height,sr+sw,sr+sw,center=true);
cylinder (height+2,sr,sr,center=true);
}
}
}
}
}
But I just get a spinning circle on my Mac.
not sure how the bounding envelope works or how long I should
expect to
wait for a result.
Any help appreciated:
Chris Johnson