On Thursday 12 November 2020 13:19:21 Chris Albertson wrote: > Yes, this is in line with my suggestions to design based on the > materials you are using. Countersinks have more bearing surface and > are stronger in plastic than counterbores but MORE IMPORTENTLY a > countersink can be printed upside down (or any orientations) with no > need for a support structure. > > There are lots of design tricks for plastic. In metal, we like to > have flat mating surfaces because they are easy to machine with a fly > cutter. But in plastic, we can print wavey mating surfaces that > interlock and self align. I like to use hemispherical bumps that fit > into hemispherical "divots". Then the screws don't need to take any > shear forces. It is trivial to do this in plastic so "why not? > Why not indeed. But freecad is going to have to grow more tools to do that and I'll have to learn them. If I can...
Thanks Chris. > On Thu, Nov 12, 2020 at 10:08 AM andy pugh <[email protected]> wrote: > > On Thu, 12 Nov 2020 at 17:05, Gene Heskett <[email protected]> wrote: > > > Suggested fixes? > > > > Countersunk screws instead of counterbored? More likely to be > > self-supporting. > > > > -- > > atp > > "A motorcycle is a bicycle with a pandemonium attachment and is > > designed for the especial use of mechanical geniuses, daredevils and > > lunatics." > > — George Fitch, Atlanta Constitution Newspaper, 1912 > > > > > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users 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
