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parametric bent rod method? (please!)

parametric bent rod method? (please!)

parametric bent rod method? (please!)

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.

RE: parametric bent rod method? (please!)

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

I built a complete rollcage this way.


RE: parametric bent rod method? (please!)

Thanks, will try monday (UK home time).

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

darcy_alan hotmail.com

RE: parametric bent rod method? (please!)

You might also consider using "bridge".  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!

RE: parametric bent rod method? (please!)

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


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