On Sunday 09 August 2020 06:21:43 Gene Heskett wrote to Bari and Andy: > On Sunday 09 August 2020 03:35:27 Gregg Eshelman via Emc-users wrote: > > Remember all this DIY 3D printing began with some Meccanno (or > > Erector Set) parts and a hot glue gun. > > That may be true, but they've had a decade to fine tune this into the > utility category. > > My latest failure involves too good an adhesion to the glass. With the > plate down to 29C, I tried to knock it loose, and the handle of the > putty knife is too high to hit the support part of the build and > cracked it at the top of the cups base curve. at which point the upper > cyclinder separated from the base surprisingly easily. There is room > for additional plastc to be laid in at that point, and I'd call that > the weak point of the design. I dn't know what I changed, but the > build in progress to replace it now used a different support base > pattern that resembles a 1000 piece puzzle cutting die with maybe 50% > contact with the glass instead of the first layers 100%. So this one > shouldn't stick that tight. But its about 5 hours to go yet. > > That weak spot might be a symptom of too low an extruder temp, or too > much fan power at the side fan. I had lowered the temp and turned up > the fan trying to stop the elephants foot at the top of the spline. So > I raised the extruder temp 2C. I'd like to be able to raise the > extruder temp to get a better layer to layer weld at that point in the > build. Or turn up the extruder rate.
So I did a bit of both. + added .05 to both x & y scales. The different support base came off the glass, not easily but a bit easier than the previous run. Fit of spline to gear now quite good, and I can't believe the improved ease of turning a bearing carrier in it to make it work. A 92 oz/in nema 17 will have no trouble running it. Still some backlash tho, so I turned up the sizes anouther .05 and started another. I got slic3r to make a gcode file, only about 10% of the size of a cura file, no temp controls, so its not ready for prime time yet even if it was making good code but was making random trash yet 3mm up, so killed it and cleaned the glass. I'm getting elephants foot top and bottom of both splines, and cleaning that up will be left to wearing it in dry by running it for an hour before I grease it. Grease is a month away anyway. Remains to be seen if it has cajones enough to turn the BS-1's worm under cutting load. Andy: How are you driving your real harmonic drive? I've seen it doing a pretty fair rpm in one of your videos, but not a good enough view to see its drive mechanics. > > On Saturday, August 8, 2020, 2:37:44 PM MDT, Bari > > <[email protected]> wrote: > > > > On 8/8/20 2:09 PM, Gene Heskett wrote: > > > On Wednesday 05 August 2020 12:28:27 Gene Heskett writes: > > > > > > Cura has a mind of its own. I have now wasted 3 days trying to get > > > it to lay down, because all the stl files for this project load > > > standing on edge, to first put the correct face down on the build > > > plate, and 2nd a 101.5% scale up for the XY distances. Obviously > > > there is a linkage between XYZ that can't be disabled, because > > > anything I touch with the mouse after setting those values in the > > > scale menu on the left, then fills those values in again with its > > > own data, ignoreing my choices. > > > > > > I've looked at slic3r, finally got it running, and the first thing > > > I note is that the .stl isn't round, but off by .05mm between xy, > > > and while cura looks like it can fix that but won't, slice3r has > > > that locked, so you can scale it all only. I can't find a > > > disconnect function. > > > > Not bad for printers that only have 0.1-0.2mm resolution. This is a > > long thread and I missed where you posted the links to the files you > > are using. Most of these tools were written by re-inventers of > > wheels and didn't know what they didn't know yet when they started. > > I can take a look at your Thingverse files here and form an opinion. > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > Cheers, Gene Heskett 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
