Ha! I got it. Pretty ugly, but it works. Thanks for your help. module screw_mount(pr=[[0,0,0,0,0,0]]) { difference() { union () { children(); for (x = pr) { translate ([x[0],x[1],x[2]]) rotate ([x[3],x[4],x[5]]) cylinder (d=10, h=2); } } for (x = pr) { translate ([x[0],x[1],x[2]]) rotate ([x[3],x[4],x[5]]) translate ([0, 0, -4]) cylinder (d=6, h=8); } } } // mounting plate union () { screw_mount ([ [ 5, 5, 3, 0, 0, 0], [25, 5, 3, 0, 0, 0], [ 5, 25, 3, 0, 0, 0], [25, 25, 3, 0, 0, 0] ]) cube ([30, 30, 3]); } On Tue, Nov 22, 2022 at 4:43 PM Daniel Miner <dgminer@gmail.com> wrote: > I'm getting closer. This works for ONE screw_mount but not two because > the plate (cube) gets added again and that fills any previous hole. > > module screw_mount(pos=[0,0,0], rot=[0,0,0]) > { > difference() > { union () > { children(); > translate (pos) rotate (rot) cylinder (d=10, h=2); > } > translate (pos) rotate (rot) translate ([0, 0, -4]) cylinder (d=6, > h=8); > } > } > > // mounting plate > union () > { > screw_mount ([ 5, 5, 3]) cube ([30, 30, 3]); // Only ONE is OK, > screw_mount ([25, 5, 3]) cube ([30, 30, 3]); // but not when adding > a second or more... > // screw_mount ([ 5, 25, 3]) cube ([30, 30, 3]); > // screw_mount ([25, 25, 3]) cube ([30, 30, 3]); > } > > On Tue, Nov 22, 2022 at 4:36 PM Daniel Miner <dgminer@gmail.com> wrote: > >> I upgraded to version 2022.11.18 but I still don't get the subtract >> (difference) when I execute. >> >> At least I now believe I understand how children() works - at least >> partially. >> >> However it seems like your example does not do what I need to do. >> I need to remove a cylinder from the cube but it ALSO needs to subtract >> the cylinder from a previously existing object. >> My initial code like this: >> >> module washer (pos=[0,0,0], rot=[0,0,0], dia=9, hgt=2) >>> { translate (pos) >>> rotate (rot) >>> translate ([-dia/2, -dia/2, 0]) >>> cube ([dia, dia, hgt]); // was: cylinder(d=dia, h=hgt); >>> } >>> >>> module screw_hole (pos=[0,0,0], rot=[0,0,0], dia=5, hgt=2) >>> { translate (pos) >>> rotate (rot) >>> translate ([0, 0, -1]) cylinder(d=dia, h=hgt+2); >>> } >>> >>> // mounting plate >>> difference() >>> { union () >>> { cube ([30, 30, 3]); // holes also cut in this object >>> washer([ 5, 5, 3]); >>> washer([25, 5, 3]); >>> washer([ 5, 25, 3]); >>> washer([25, 25, 3]); >>> } >>> screw_hole([ 5, 5, 0], hgt=6); >>> screw_hole([25, 5, 0], hgt=6); >>> screw_hole([ 5, 25, 0], hgt=6); >>> screw_hole([25, 25, 0], hgt=6); >>> } >>> >> >> Note the screw_hole goes through the washer AND the 30x30x3 plate (cube). >> >> On Tue, Nov 22, 2022 at 3:43 PM David Phillip Oster < >> davidphilliposter@gmail.com> wrote: >> >>> On Tue, Nov 22, 2022 at 1:41 PM Daniel Miner <dgminer@gmail.com> wrote: >>> >>>> I did run it. See attached. I'm running: >>>> >>>> version 2021.01 >>>> >>> 2022.03.14 for me. >>> _______________________________________________ >>> OpenSCAD mailing list >>> To unsubscribe send an email to discuss-leave@lists.openscad.org >>> >>

Adrian, I had not heard of BOSL2. Thanks for the pointer. It looks REALLY useful! On Tue, Nov 22, 2022 at 4:55 PM Daniel Miner <dgminer@gmail.com> wrote: > Ha! I got it. Pretty ugly, but it works. > Thanks for your help. > > module screw_mount(pr=[[0,0,0,0,0,0]]) > { > difference() > { union () > { children(); > for (x = pr) > { translate ([x[0],x[1],x[2]]) rotate ([x[3],x[4],x[5]]) > cylinder (d=10, h=2); > } > } > for (x = pr) > { translate ([x[0],x[1],x[2]]) rotate ([x[3],x[4],x[5]]) > translate ([0, 0, -4]) cylinder (d=6, h=8); > } > } > } > > // mounting plate > union () > { > screw_mount ([ [ 5, 5, 3, 0, 0, 0], > [25, 5, 3, 0, 0, 0], > [ 5, 25, 3, 0, 0, 0], > [25, 25, 3, 0, 0, 0] ]) cube ([30, 30, 3]); > } > > > On Tue, Nov 22, 2022 at 4:43 PM Daniel Miner <dgminer@gmail.com> wrote: > >> I'm getting closer. This works for ONE screw_mount but not two because >> the plate (cube) gets added again and that fills any previous hole. >> >> module screw_mount(pos=[0,0,0], rot=[0,0,0]) >> { >> difference() >> { union () >> { children(); >> translate (pos) rotate (rot) cylinder (d=10, h=2); >> } >> translate (pos) rotate (rot) translate ([0, 0, -4]) cylinder >> (d=6, h=8); >> } >> } >> >> // mounting plate >> union () >> { >> screw_mount ([ 5, 5, 3]) cube ([30, 30, 3]); // Only ONE is OK, >> screw_mount ([25, 5, 3]) cube ([30, 30, 3]); // but not when >> adding a second or more... >> // screw_mount ([ 5, 25, 3]) cube ([30, 30, 3]); >> // screw_mount ([25, 25, 3]) cube ([30, 30, 3]); >> } >> >> On Tue, Nov 22, 2022 at 4:36 PM Daniel Miner <dgminer@gmail.com> wrote: >> >>> I upgraded to version 2022.11.18 but I still don't get the subtract >>> (difference) when I execute. >>> >>> At least I now believe I understand how children() works - at least >>> partially. >>> >>> However it seems like your example does not do what I need to do. >>> I need to remove a cylinder from the cube but it ALSO needs to subtract >>> the cylinder from a previously existing object. >>> My initial code like this: >>> >>> module washer (pos=[0,0,0], rot=[0,0,0], dia=9, hgt=2) >>>> { translate (pos) >>>> rotate (rot) >>>> translate ([-dia/2, -dia/2, 0]) >>>> cube ([dia, dia, hgt]); // was: cylinder(d=dia, h=hgt); >>>> } >>>> >>>> module screw_hole (pos=[0,0,0], rot=[0,0,0], dia=5, hgt=2) >>>> { translate (pos) >>>> rotate (rot) >>>> translate ([0, 0, -1]) cylinder(d=dia, h=hgt+2); >>>> } >>>> >>>> // mounting plate >>>> difference() >>>> { union () >>>> { cube ([30, 30, 3]); // holes also cut in this object >>>> washer([ 5, 5, 3]); >>>> washer([25, 5, 3]); >>>> washer([ 5, 25, 3]); >>>> washer([25, 25, 3]); >>>> } >>>> screw_hole([ 5, 5, 0], hgt=6); >>>> screw_hole([25, 5, 0], hgt=6); >>>> screw_hole([ 5, 25, 0], hgt=6); >>>> screw_hole([25, 25, 0], hgt=6); >>>> } >>>> >>> >>> Note the screw_hole goes through the washer AND the 30x30x3 plate (cube). >>> >>> On Tue, Nov 22, 2022 at 3:43 PM David Phillip Oster < >>> davidphilliposter@gmail.com> wrote: >>> >>>> On Tue, Nov 22, 2022 at 1:41 PM Daniel Miner <dgminer@gmail.com> wrote: >>>> >>>>> I did run it. See attached. I'm running: >>>>> >>>>> version 2021.01 >>>>> >>>> 2022.03.14 for me. >>>> _______________________________________________ >>>> OpenSCAD mailing list >>>> To unsubscribe send an email to discuss-leave@lists.openscad.org >>>> >>>

A bit late on this one perhaps, but I don’t check the forum regularly. Don’t quite see what the fuss is about. Surely you only need “children” to arrange DIFFERENT objects, like for text. I have used children but don’t really understand how it works. This is how I would do it, with DM’s original for reference. The washers are $fn=3 to show orientation, though for round objects, it doesn’t matter. BTW: It would be nice if “center=true” could be selected as default for a given script. // Daniel Miner: module screw_mount(pr=\[\[0,0,0\]\]) { difference() { union () { children(); for (x = pr) { translate (\[x\[0\],x\[1\],x\[2\]+1\]) cylinder (d=10, h=2, $fn=3); // washer }} for (x = pr) { translate (\[x\[0\],x\[1\],x\[2\]\]) translate (\[0, 0, -4\]) \#cylinder (d=6, h=8); // hole }}} // mounting plate union () { screw_mount (\[ \[ 5, 5, 3\], \[25, 5, 3\], \[ 5, 25, 3\], \[25, 25, 3\] \]) cube (\[30, 30, 3\]); // plate } // If orientation doesn't matter, why not: translate (\[0, 0, 20\]) { difference() { union() { cube (\[30, 30, 3\], center=true); // plate for (i=\[0:90:270\]) rotate (\[0, 0, i\]) translate (\[10, 10, 3\]) cylinder (d=10, h=2, $fn=3); // washer } for (i=\[0:90:270\]) rotate (\[0, 0, i\]) translate (\[10, 10, -2\]) \#cylinder (d=6, h=8); // hole }} // For same orientation: translate (\[0, 0, 40\]) for (i=\[0:90:270\]) rotate (\[0, 0, i\]) translate (\[10, 10, 0\]) rotate (\[0, 0, -i\]) // to correct orientation cylinder (d=10, h=2, $fn=3); // washer // Or just: translate (\[0, 0, 60\]) for (i=\[-10:20:10\]) for (j=\[-10:20:10\]) translate (\[i, j, 0\]) cylinder (d=10, h=2, $fn=3); // washer

On 12/26/22 01:12, mikeonenine@web.de wrote: > A bit late on this one perhaps, but I don’t check the forum regularly. > > Don’t quite see what the fuss is about. Surely you only need “children” > to arrange DIFFERENT objects, like for text. I have used children but > don’t really understand how it works. This is how I would do it, with > DM’s original for reference. The washers are $fn=3 to show orientation, > though for round objects, it doesn’t matter. > > BTW: It would be nice if “center=true” could be selected as default for > a given script. > plus 1000, turn it false on a module by module basis if NOT wanted, save a lot of typing at my 10-20. [...] Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/>

I think if you want center=true to be the default the way to do it is to write yourself a new module, ccube() or something. Or you can use BOSL2 in which centered is the default for most objects. I suppose you could write a new cube module that accepts a $ parameter for centering, which would allow the requested behavior, but it seems like it could get confusing. On Mon, Dec 26, 2022 at 3:44 AM gene heskett <gheskett@shentel.net> wrote: > On 12/26/22 01:12, mikeonenine@web.de wrote: > > A bit late on this one perhaps, but I don’t check the forum regularly. > > > > Don’t quite see what the fuss is about. Surely you only need “children” > > to arrange DIFFERENT objects, like for text. I have used children but > > don’t really understand how it works. This is how I would do it, with > > DM’s original for reference. The washers are $fn=3 to show orientation, > > though for round objects, it doesn’t matter. > > > > BTW: It would be nice if “center=true” could be selected as default for > > a given script. > > > > plus 1000, turn it false on a module by module basis if NOT wanted, save > a lot of typing at my 10-20. > > [...] > > Cheers, Gene Heskett. > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/> > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >