parametric bent rod method? (please!)

[Darce]

Help please! The prodigal CAD user seeks guru! (turned my back on UG in '91....but I'm back now!)

I need to create a bent piece of rod/tube (brake pipe) and the model must be parametric. The tube is a series of straights with constant radii bends separating them. I have tried <curve op><combined project> but don't think this will get me the result I require. There must be a way that I can enter a series of xyz vals (using spreadsheet even?) join the dots and fillet the bends before using a sweep operation? if so will the points be modifiable and the part update retain the fillets? (this is a MUST!)
Should I create each straight and bend on a sketch using parametric datum planes?
Ford have a prog file that does these parts in 20seconds and tabulates the co-ords for use in the dwg - something similar must be possible in UG??? Thanks, Darce.

 

[Dave K]

How about a sketch, or series of sketchs that defines the centerline of your tube? Then, use the &quot;Tube&quot; command to create the solid?

I built a complete rollcage this way.

-Dave

http://www.moslerauto.com

 

[Darce]

Thanks, will try monday (UK home time).

Respect. Once did a mid-engined spaceframe in I-Deas, was not the easiest of jobs!


Darce
darcy_alan hotmail.com

 

[sociallyinept]

You might also consider using &quot;bridge&quot;. I love it. I had similar problems making springs and wires with the fillets that I wanted. Basically, you make two curves with a gap between them (my gap was to make the fillet). Then, you select Insert/Curve Operation/Bridge and select the two curves you want to bridge. It takes a little practice to learn how far apart to make the gap but it works great! It is easy to modify as well. Think of this approach as a fillet in 3D. Good luck!

 

[groverlee]

I would try the using the routing package if you have that license. It does a fairly good job at creating guide strings through all three axis without having to go through the steps af creating numerous sketches. I have not used routing in any version past v18, but it should be worth a try.

Good Luck,
Chip Tasker
Machine Designer / CAD analyst

chptskr@aol.com