On Tuesday 28 July 2020 12:52:09 Chris Albertson wrote: > Don't scale the entire part unless caliper show you the entire part is > scaled too small. (this is very unlikely) Better to simply adjust > the one hole you need to be larger. Or if it is less than about > 0.1mm put the part on a lather and bore it out to size. I did this > to all my timing belt rings to make them fit perfectly to the 24mm > hubs. If you go slow so as not to melt the PLA the carbide boring > bar works and just took off "fuzz" > holes aren't bothering me, other than hard toremove support crap. What is bothering me is the incomplete mesh I saw in the movies, and that easily fixed by changing the printer x and y scales.
I think its obvious now that whats published is not 100% optimized. > The hole seems small but usually, it is because the plastic was not > laid down perfectly and there are bumps and ridges and lines inside > the hole. Make the hole perfect rather then making another larger > not-perfect hole. Also it is MUCH quicker to bore the hole then > re-print the part. > > The other trick I do is to make "temporary" bearings with either > aluminum or even PLA while waiting for the real bearing to arrive. > You could make them on a manual lathe in a few minutes and then you > could verify the parts work and there is not OTHER problem before > doing another 16 hour print > > I'd be surprised if you did not need to clean up the fine pitch gears > with a nail file. They are amazingly clean after removal of the brim. 10 minute job to clean them up. > Most 3D prints require some post-processing with a > tiny file and maybe #600 wet and dry paper. A boring bar makes the > inside of holes smooth as glass. > > A read a translation of the designer's blog page and it seems he wants > to make a 6 axis arm with these. He will probably need to make some > of the parts near the base of the arm in metal I wouldn't be surprised. These are, if built as published, going to have enough backlash to wreck a 6 joint arm. What I'm getting off the printer, does not always match his pix. Properly fine tuned it definitely has commercial prospects to be exploited, and I can do a bit of that fine tuning. Thanks Chris [...] 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
