conical extrusion help.

[terman]

hi everybody,

i need some help or some tips. i'm just starting with NX3.

i'm trying to make a conical extrusion of a sketch that is quite complicated. i'm able to do it if the angle is less than 4 degrees but if i put more the feature is not possible any more.

is there another way of doing it?

If somebody could help me i'd appreciate.

thanks.

 

[cowski]

Is the taper making the part larger or smaller?
How much taper are you looking to add?

A few (untested) ideas:
If the taper makes the part larger, you may have features running into each other at angles greater than 4. If the taper makes the part smaller, some features may be disappearing before the end of the extrude. I'm not 100% sure that either of these conditions would cause an error, but I would not be surprised if they did.

You may want to save a copy of your file to experiment with and simplify your sketch until it will extrude. My guess is there is 1 or 2 features of your sketch that are causing the problem. I would try to simplify the sketch and see if I could add those features later.

 

[Xwheelguy]

If you can, remove all radii from your sketch (as cowski suggested by simplifying) then try extruding it. If it will extrude, then you have to make the smaller radii larger because your radii are variable as they are being extruded with the draft. For example, if you try to extrude an R6 over 100mm with 7° draft, it's probably going to fail because the R6 reaches R0 before the extrusion reaches the height of 100mm. The only other alternative is to extrude the sketch without any radii, then apply edge or face blends after the extrusion. You can still have the variable radii effect with both of these blend types.

I'm not sure what you mean by a conic extrusion, but if there is a conic in your sketch & it fails during the extrusion, again try removing the conic from the sketch & extruding. If it extrudes without the conic, then either blunt the conic by making the rho value smaller (rounder) or apply a conic face blend after the extrusion. You can create variable radius conic face blends, but that's a little more challenging than a variable radius circular blend in NX.

Hope this helps a little.

Tim Flater
Senior Designer
Enkei America, Inc.

http://www.enkei.com

 

[Azrael]

Try a projection with a draft angle and see what´s fucking up and tackle it from there

 

[terman]

thanks for all this answer it was very fast.

for info the taper make my part larger
I will try to remove radius from my sketch then extrude with an angle and then add a radius...

i will tell you what happen.