On Tuesday 04 August 2020 13:23:41 Chris Albertson wrote: > On Tue, Aug 4, 2020 at 7:11 AM Gene Heskett <ghesk...@shentel.net> wrote: > > On Tuesday 04 August 2020 05:23:49 andy pugh wrote: > > > On Tue, 4 Aug 2020 at 09:49, Gene Heskett <ghesk...@shentel.net> wrote: > > > > And the > > > > hole size isn't shown in freecad, or I don't know how to display > > > > it. > > > > > > You might need to measure it. As it is STL that will end up being > > > vertex-to-vertex so may take a few attempts to find the maximum. > > > In fact that could be part of the problem, STL will by its nature > > > tend to shrink concave shapes. How many facets make up the bore? > > > > Freecad doesn't show me that from the step file input either. > > Yes, the CAD file (.step file) models the hole with a circle. Only > after you output the part as an STL, is the circle converted to a > polygon. STL files only have straight lines, no curves. To see how > many sides, you need to look at the STL file. If there are few > enough sides on the polygon to count by eye then it is a problem. > The software SHOULD choose the number of sides such that the error in > approximating a circle is below some specified tolerance like 0.001mm > or whatever. When Fusion360 exports to STL there is some fine > control over the process and I can set the allowed errors. I assume > your CAD system has this too. It might default to something you don't > want. I'd check this but I doubt the default is unreasonable. > > Likey the problem is shrinkage, And the unavoidable problem of inside > (concave) surfaces having too much plastic > > As said, boring the hole is the best option if you intend to press-fit > a bearing but likely sandpapering the hole is good enough > That would quite a while. I tried by hand with a piece of 320 but didn't do anywhere enough damage to start helping in 15 minutes. > > Chris Albertson > Redondo Beach, California > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
