Re: preview difference() glitch
Roger, To avoid the problem when diferencing cylinders to make a pipe, I've
switched to using:
//******************************
module pipe( length, OD, ID, center=false )
//******************************
{
offsetZ = (center==false)? 0 : -0.5*length;
translate( [ 0, 0, offsetZ ] )
rotate_extrude( angle=360 )
translate( [ 0.5ID, 0, 0 ] )
square( [ 0.5(OD-ID), length ] );
}
//******************************
//pipe( 5, 10, 5 );
On Fri, Dec 23, 2022 at 5:13 AM Roger Whiteley via Discuss <
discuss@lists.openscad.org> wrote:
---------- Forwarded message ----------
From: Roger Whiteley roger.whiteley@me.com
To: discuss@lists.openscad.org
Cc:
Bcc:
Date: Fri, 23 Dec 2022 11:13:25 +0000
Subject: [OpenSCAD] Re: preview difference() glitch
Chris, aka nop.head - your tip about viewing in Orthogonal instead of
Perspective is worthy of a Big Thank You - a festive tipple of your
choice, pint of Robinson's perhaps?
If I am differencing cylinders to make a tube, I use a default offset of
0.1, but assigned to a 'constant', which I called cd, then I make the
length of the inner cylinder plus 2xcd. It makes offsetting so much
easier when I use a module that makes the hole and puts a chamfer either
side of the hole thus:
module chamfered_hole_45 (hole_dia,plate_thick,hole_cham=1,bolt_round=40) {
echo (hole_dia,plate_thick,hole_cham,bolt_round);
//bolt_round = 40;
hole_depth = 2*plate_thick ;// just makes a long pole :-)
l_hole_dia = hole_dia;
l_hole_cham = hole_cham;
echo (hole_depth=hole_depth);
echo (bolt_round=bolt_round);
cylinder(d1=l_hole_dia+l_hole_cham*2,d2=l_hole_dia,h=l_hole_cham,$fn=bolt_round);
cylinder_outer (l_hole_dia/2,hole_depth+1,bolt_round);
translate([0,0,plate_thick-l_hole_cham])
cylinder(d1=l_hole_dia,d2=l_hole_dia+l_hole_cham*2,h=l_hole_cham,$fn=bolt_round);
}//end module
cylinder_outer is another module that compensates for the geometry going
round the inside of the 'hole' and making it undersize.
module cylinder_outer(radius,height,fn){
fudge = 1/cos(180/fn);
cylinder(h=height,r=radius*fudge,$fn=fn);}
Compliments of the season to all our readers ;-)
Roger
---------- Forwarded message ----------
From: Roger Whiteley via Discuss discuss@lists.openscad.org
To: discuss@lists.openscad.org
Cc: Roger Whiteley roger.whiteley@me.com
Bcc:
Date: Fri, 23 Dec 2022 11:13:25 +0000
Subject: [OpenSCAD] Re: preview difference() glitch
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
Or linear_extrude the difference between two circles.
On Fri, 23 Dec 2022 at 16:35, Leonard Martin Struttmann <
lenstruttmann@gmail.com> wrote:
Roger, To avoid the problem when diferencing cylinders to make a pipe,
I've switched to using:
//******************************
module pipe( length, OD, ID, center=false )
//******************************
{
offsetZ = (center==false)? 0 : -0.5*length;
translate( [ 0, 0, offsetZ ] )
rotate_extrude( angle=360 )
translate( [ 0.5ID, 0, 0 ] )
square( [ 0.5(OD-ID), length ] );
}
//******************************
//pipe( 5, 10, 5 );
On Fri, Dec 23, 2022 at 5:13 AM Roger Whiteley via Discuss <
discuss@lists.openscad.org> wrote:
---------- Forwarded message ----------
From: Roger Whiteley roger.whiteley@me.com
To: discuss@lists.openscad.org
Cc:
Bcc:
Date: Fri, 23 Dec 2022 11:13:25 +0000
Subject: [OpenSCAD] Re: preview difference() glitch
Chris, aka nop.head - your tip about viewing in Orthogonal instead of
Perspective is worthy of a Big Thank You - a festive tipple of your
choice, pint of Robinson's perhaps?
If I am differencing cylinders to make a tube, I use a default offset of
0.1, but assigned to a 'constant', which I called cd, then I make the
length of the inner cylinder plus 2xcd. It makes offsetting so much
easier when I use a module that makes the hole and puts a chamfer either
side of the hole thus:
module chamfered_hole_45 (hole_dia,plate_thick,hole_cham=1,bolt_round=40)
{
echo (hole_dia,plate_thick,hole_cham,bolt_round);
//bolt_round = 40;
hole_depth = 2*plate_thick ;// just makes a long pole :-)
l_hole_dia = hole_dia;
l_hole_cham = hole_cham;
echo (hole_depth=hole_depth);
echo (bolt_round=bolt_round);
cylinder(d1=l_hole_dia+l_hole_cham*2,d2=l_hole_dia,h=l_hole_cham,$fn=bolt_round);
cylinder_outer (l_hole_dia/2,hole_depth+1,bolt_round);
translate([0,0,plate_thick-l_hole_cham])
cylinder(d1=l_hole_dia,d2=l_hole_dia+l_hole_cham*2,h=l_hole_cham,$fn=bolt_round);
}//end module
cylinder_outer is another module that compensates for the geometry going
round the inside of the 'hole' and making it undersize.
module cylinder_outer(radius,height,fn){
fudge = 1/cos(180/fn);
cylinder(h=height,r=radius*fudge,$fn=fn);}
Compliments of the season to all our readers ;-)
Roger
---------- Forwarded message ----------
From: Roger Whiteley via Discuss discuss@lists.openscad.org
To: discuss@lists.openscad.org
Cc: Roger Whiteley roger.whiteley@me.com
Bcc:
Date: Fri, 23 Dec 2022 11:13:25 +0000
Subject: [OpenSCAD] Re: preview difference() glitch
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org