[OpenSCAD] Engineering Fits and Tolerance

nop head nop.head at gmail.com
Tue Oct 29 19:20:00 EDT 2019


Yes it is H7 for holes to accept h7 shafts as a slip fit. I know because
that is what 3D printer pulleys should be for stepper motors and I got a
batch from China that didn't fit so had to get expensive measuring
equipment. 1 micron micrometer and an H7 limit plug gauge and H7 reamers.

On Tue, 29 Oct 2019 at 22:57, adrianv <avm4 at cornell.edu> wrote:

> Well, if it's supposed to be like a screw thread tolerance then the letter
> specifies a "tolerance position", which gives a maximum diameter for the
> bolt shaft.  The number gives the tolerance range below this maximum.  One
> could imagine using this to shrink models to compensate for overextrusion.
> But this is a specific standard for machine screw threads and the value of
> the tolerance even depends on the screw shaft diameter.   It doesn't apply
> broadly to arbitrary objects.  (It doesn't even apply to nuts, which use
> capital letters.)
>
> Even if you could figure out how to define it for arbitrary objects, how
> would OpenSCAD know whether a component needed to be enlarged or shrunk?  I
> don't see that there's any way to do this automatically.
>
>
> nophead wrote
> > Not sure I understand. h7 specifies a tolerance, i.e. a range of possible
> > sizes that can be tested with a limit gauge or a micrometer. How can that
> > be expressed in a model, which always has a definite size?
> >
> > On Tue, 29 Oct 2019 at 22:00, Hugo Jackson <
>
> > hugo@
>
> > > wrote:
> >
> >> Has any thought been given to incorporating engineering fits and
> >> tolerances into OpenSCAD? As I understand it, OpenSCAD was originally
> >> conceived for the creation of STL files for a 3D printer and I’ve been
> >> thinking that the base functionality might be improved by a little more
> >> CAM
> >> in the CAD.
>
>
>
>
>
> --
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>
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