Variable pitch helix along the curve

[kirillyrogov]

Hello,

Please is there any way to make 3d sketch helix with variable pitch along the path (bend pipe)? Or maybe another way to make coil with variable pitch along the path.
Thank you in advance for your help!

[Anonymous]

You would want to use the Sweep function to do this.  You need two sketches, one will be the cross-section, the next will be the path (pitch).  Make sure the cross-section and path are lined up how you want them, usually a good idea to have the path intersect the cross-section at the center.

[blandb]

I believe the user is stuck on how to create the variable pitched swept path for the sweep.

[0x3FA5]

It's pretty easy:

In a part, select a sketch that contains a circle. Click Insert > Curve > Helix/Spiral. In the PropertyManager, under Defined By, select Height and Revolution. Under Parameters, select Variable pitch. Enter values for H and Rev in the table.

[kirillyrogov]

Ok, I can make coil with variable pitch (straight pipe in the img). I can make coil along the curve, but with constant pitch (pipe bend in the img). And now i want it all together.

[blandb]

Are you referring to solidworks? You screen shot appears to be SW.

[0x3FA5]

Yes, it is SW 2011

[blandb]

Are you doing it as a multi-body solid? If each coil is a different solid, have you tried combining them into just (1) solid? Can you share your files?

[johnsonshiue · Accepted solution]

Hi! This can be done in Inventor pretty easily. It is a two-step process.

1) Create a straight tube.

2) Create the variable-pitch variable-radius helix (3D Sketch -> Helical Curve -> VPVR). Make sure the helix wrap around the tube.

3) Split -> select the helical curve as a tool to split the tube.

4) Use Bend Part command (it needs a straight line penetrating the tube) to bend the tube. The helical edges will be bent too.

Many thanks!

[blandb]

I was going to suggest that, but I thought from the first picture that it may have been a tube and pipe run? But the concept could still be applied to a multi-body part to create what is being wrapped around the tube?

Just a thought.

[kirillyrogov]

Yeah! It works. Thanks a lot! Great support and community!