Problem with collision detection in 2003 with all the service packs

Hi, I have made an assembly with a box section with a two holes through it.
There is a metal rod that passes through the box section. The rod has a 7mm
slot with a circlip, (7.2mm inside dia and 11mm outside dia), in it, which
is mated concentrically to the rod, and to one face of the slot, i.e. fixed
to the rod. The holes in the box section are 8.2mm dia and the rod is 8mm
dia. The rod is mated concentrically to the holes. The rod with the circlip
moves through the box section holes and stops when the circlip hits the box
section, which is correct, when the rod is moved slowly. But when I move the
rod fast through the hole, there is no collision detection, and the rod and
the circlip goes through the box section and out the other side!!
Hmmm! I think a bug I have found, Says Yoda

 

This has always been the case with collision detection in SWX. If parts
are drug (drug, is that a word?) too fast, things can pass through each
other because the refresh is too slow.

In effect, the part is teleported through and thus, never does really
collide. Hey, look, SWX has invented the teleporter!!!!!!! I wonder
how they do it, must be wormholes!

 

section, which is correct, when the rod is moved slowly. But when I move
the

I.M.O this is not a bug, but a feature of collision detection. Collision
detection is rather complicated and it takes some time to determine whether
the bodies collide with each other. SW doesn't have infinite time to
calculate collisions in all possible positions of the rod when you move it.
If you move the shaft very fast, the shaft may "move" with larger steps than
the thickness of the circlip and the material in the hole.

I believe that it is possible to create a such algorithm, which would
calculate the total volume which the moving part creates while sweeping
through the space. If this volume would then be used in collision detection,
such problems should not happen. However, calculating the volume is even
more complicated, but maybe in the distant future we might see this kind of
solutions as the computers keep up on evolving...

-h-