Thread Interference Problem

[Anonymous]

Hello- I have tried to build an assembly with threaded parts in 5.0. Even
though the threads match when I check for interference I always have
interference where the male and female threads intersect. Am I doing
something wrong in the assembly?

Thanks-

Jason Richards

[Anonymous]

Have you modelled the threads or simply added a fastener to the tapped hole?

--
Laurence,

Power is nothing without Control
---


"rchrds" wrote in message
news:A42EEE20C806DC8946B439876BAF5DA5@in.WebX.maYIadrTaRb...
> Hello- I have tried to build an assembly with threaded parts in 5.0. Even
> though the threads match when I check for interference I always have
> interference where the male and female threads intersect. Am I doing
> something wrong in the assembly?
>
> Thanks-
>
> Jason Richards
>
>
>

[Anonymous]

"rchrds" wrote in message
> Hello- I have tried to build an assembly with threaded parts in 5.0. Even
> though the threads match when I check for interference I always have
> interference where the male and female threads intersect. Am I doing
> something wrong in the assembly?

Jason,

When you create a threaded hole using the hole command, Inventor simply
places a cylindrical hole. The diameter of the cylinder can be controled and
you can set it to be major/minor or pitch diameter as I recall.

The library fasteners when placed into a threaded hole of the specified
diameter using the shipped defaults create "interference" which will cause
you problems when driving a constraint (for example).

You should probably disable fasteners when doing interference analyses to
eliminate the noise.

Ignoring threaded interference is on a list of things we'd like to add to
the systems options.

G

[Anonymous]

And press-fit interference, too.

--
Dave Jacquemotte
Automation Designer
www.autoconcorp.com



"Gary R Smith (Autodesk)" wrote in message
news:5165716743DD32559EE42BE6EEF33D31@in.WebX.maYIadrTaRb...
>
> "rchrds" wrote in message
> > Hello- I have tried to build an assembly with threaded parts in 5.0. Even
> > though the threads match when I check for interference I always have
> > interference where the male and female threads intersect. Am I doing
> > something wrong in the assembly?
>
> Jason,
>
> When you create a threaded hole using the hole command, Inventor simply
> places a cylindrical hole. The diameter of the cylinder can be controled and
> you can set it to be major/minor or pitch diameter as I recall.
>
> The library fasteners when placed into a threaded hole of the specified
> diameter using the shipped defaults create "interference" which will cause
> you problems when driving a constraint (for example).
>
> You should probably disable fasteners when doing interference analyses to
> eliminate the noise.
>
> Ignoring threaded interference is on a list of things we'd like to add to
> the systems options.
>
> G
>
>

[Anonymous]

Ignoring deliberate press fits in an interference check would be very
helpful, but there would probably need to be some means of identifying that
a press fit was intended. It doesn't sound like that would have to be
anything very involved. It might be something like finding them in the
first check, but allowing an RMB so that a click would mark it to ignore in
future checks.

I also see problems with the display of interfering parts. I suppose the
software gets confused during hidden line removal when two parts occupy the
same space. To get a good iso or shaded iso, I often have to reduce the
size of pins or enlarge holes so that the lines do not get scrambled at the
areas of interference. This is not desireable because it is best if I
change those parts back to the true size (relying on memory). It seems like
there should be a way to make the system properly display the parts that are
outermost or closest to the viewpoint. I remember a couple years ago when
using Pro/E this was a continuing problem. Can something be done to improve
this?

Ed R


"Dave Jacquemotte" wrote in message
news:61C670443CCD6A38B8FA7F95F9C7387B@in.WebX.maYIadrTaRb...
> And press-fit interference, too.
>

[Anonymous]

Why ignore treaded parts?
I would like to know if:
1. The male and female part are the same thread designation.
2. The centerlines are collinear
3. The start and end of the male and female part does not overlap.

If thoose conditions were met it would feel safe to say that therer is no interference.