Scaling problems

[SW]

I'm trying to scale a part before saving as .stl for prototyping, but a
pattern of one of the features goes wrong, as shown on the following
images. I guess this is something to do with the way the pattern is
defined (by axis), but surely a program like Pro/Engineer should handle
operations such as this with a bit more intelligence?



Has anyone got any ideas to stop this happenning?



Thanks,



Sam

 

[csusie]

Are you scaling or applying shrinkage? this may make a difference. Why dont your try scaling after you make the stl file? Your prototyping client software should be able to scale too. Just some work arounds for you

 

[Guest]

Are you have a"prt" file?

 

[Zaki]

May ur patern leader need to redefine Sam, just check how did u make the first feature of pattern, u can also use family table option, or as csusie told scale the stl file.

 

[SW]

Thanks for the suggestions, I've got the prototyping company to do the
scaling for me now. I had a bit of a play though and could just restore
the scaling dimension angle back to its original value.



I was rescaling the part, in actual fact the shrinkage command is much
better in this instance, thanks. I'm still not sure why Pro/E makes a
mess of things and scales the angular pattern dimension when the part
is rescaled though, I find little problems like this all the time with
Pro/Engineer, even when doing things I've done plenty of times before.



Thanks for the help,





Sam

 

[SW]

The images are shown below and I've attached the part file if anyone is
interested. The part is a skeleton model so has to be copied to a
standard part before the shrinkage command is executed.



2006-06-08_054102_rotor_unit_skel0001.prt.zip



View attachment 2357



View attachment 2358

<a href="uploads/SW/2006-06-08_054102_rotor_unit_skel0001.prt.zip" target="_blank">

</a>

 

[csusie]

Scaling should only change the non-angular dimensions. I do see that you have some geometry checks on the blades. The model scales with no problem before the blades exist. The geom check is produced because the blade is producing tiny edges, and by scaling it down futher, those geom checks get worse to the point it cannot regenerate the model anymore. I would fix the geometry check and then try to scale the model. Shrinkage should not be used to scale.

 

[SW]

Why do suggest it is a bad idea to use shrinkage to scale the model?
Although its not quite as the command was intended, a parametric
feature such as this seems ideal for producing a scale model of a part.

 

[hlf71]

you pattern use aix A_13 not is aix A_7, this will no problem

 

[SW]

Thanks, but why is Pro/Engineer scaling the angle if axis A_7 is used?

 

[hlf71]

aix A_7 is not a resovle center, so if you pattern use it, proe will think it is a non-angular.


my english no good, hope you can understand