Stuck again

3D printing countersinks is not as straightforward as it might seem. See the article I wrote here: https://hydraraptor.blogspot.com/2020/12/sinkholes.html and some real world results here: https://github.com/nophead/NopSCADlib/issues/134#issuecomment-804221666

On Sat, 3 Apr 2021 at 21:39, Gene Heskett <[hidden email]> wrote:

On Saturday 03 April 2021 15:45:32 larry wrote:

> On my machine..
>
> Total rendering time: 0 hours, 0 minutes, 5 seconds
>
Sounds about right, remove the for and its under a second.  This is a 6
core i5, with 32G but OpenSCAD is not multithreaded, only usees one core
at a time. Cura uses all 6. gkrellm keeps track of all that for me.

Thanks Larry.
Take care & stay well now.

> On Sat, 2021-04-03 at 14:11 -0400, Gene Heskett wrote:
> > Greetings all;
> >
> > First I have switched back to my ender-3 printer, with mods, and its
> > working quite well once I figured out the math to correct some off
> > scaling it had.
> >
> > Now I have composed the output shafts cup that will have one of the
> > spline gears glued into it, and the resized bearing I was working
> > on,
> > installed on the outside of this somewhat looeely defined cup as the
> > rim
> > is only 9.5mm high, just enough to accept the thickness of one of
> > the
> > spline gears.
> >
> > But before I make the final version, I'd like to make this cup the
> > first
> > of two items for a differential() { operation, where the subtracted
> > would be the holes for 6 or 8 flathead screws on a 30mm radius
> > circle,
> > spaced at 60 or 45 dregres.
> >
> > That I assume will take a cylinder for the screw hole, and a dual
> > diameter cyclinder at the top to remove both the bolt hole and
> > remove
> > the contersink for the underside of the flathead screws.
> >
> > And I think I got it, but that for loop still takes a noticable
> > amount of
> > time.
> > See what you folks think.
> > // more of my feeble attempt at making a harmonic drive
> > // this will be the output coupling cup, a shallow
> > // thing that one of the toothed rings will be pressed
> > // and glued into. And the new bearing will be sized to
> > // this parts OD
> > innrd=120.2; // OD of spline part
> > outrd= 129.7; // innr of bearing ID, is from bearings
> > //square size
> > walthk=5.000; // will also be radius increment
> > walhgt=9.5; // height of cup depth
> > walhlf=walhgt*.5; // might be usefull in translate's
> > innrr=.5*innrd; // ditto
> > outrr=.5*outrd;
> > trans=.5*outrr;
> > cupradtmp=innrr+outrr;
> > cupdia=.5*cupradtmp;// another translator
> > 6holes=60;
> > 8holes=45;
> > module disc()
> > {
> >   difference()
> >   {
> >     rotate_extrude($fn=360)
> >     union()
> >     {
> >     translate([trans,2.5,0]) square([outrr,walthk],true);
> >     translate([cupdia,walhgt])square([5.0,walhgt],true);
> >     };
> > // Insert bolthole code here, becomes 2nd argument to difference
> >     for(hole=[0:8holes:360])
> >     {
> >       rotate(hole)
> >       union()
> >       {
> >         translate([30,0,-.5])cylinder(4,d=2.5,$fn=32,true);
> >       
> > translate([30,0,3.5])cylinder(2.5,r1=2.5,r2=4.5,$fn=32,true); };
> >     };
> >   };
> > };
> > disc();
> >
> > Thanks for any helpfull hints.
> >
> > Cheers, Gene Heskett
>
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Cheers, Gene Heskett
--
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-Ed Howdershelt (Author)
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 - Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>
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Ron Wheeler
Artifact Software
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