Reverse Direction of Curve Pattern

john_mcclary

I can't figure out how to reverse the direction of this curve pattern

I need 1 part in the direction shown (lower clockwise), and one part in the opposite direction (higher counterclockwise).

But both helix curves put the part lower clockwise.

If I then hide part<1> and pattern part<2> using the same curve; it then makes a new part in the same position as part<1>

How can I control the direction of the pattern?
How come there isn't an option to flip the direction along the curve

Thanks

https://cad.onshape.com/documents/28050bca2b1ddeb0acbab720/w/72369ffa7faabbf84de28ab1/e/c327eb1c365e08ad62fdd2dd

robert_morris

The original Curve Pattern FeatureScript written by Jon Sorrells  has an option to reverse the direction.
It has some other options that aren't in the official tool as well.

Link: https://cad.onshape.com/documents/572e1daae4b085edae52bf83/v/5450ca5527083685b67ddbd6/e/0de35a1a831305b2b691a995

konstantin_shiriazdanov

can't see how to do it without additional features, you have two helices which parametrization should be opposite but for them pattern works in the same direction

john_mcclary

Right, I assumed the pattern would follow the direction the helix was drawn. I wondur if this is a bug or what.

konstantin_shiriazdanov

https://cad.onshape.com/documents/a1c1ac401356e11aeac0b1ff/w/bff8a9e79db5cce60d2001c0/e/853d91463b9d75d9ad13a017
the question is how curve pattern select start and end point of the curve. i didn't dig into it source code, but based on it's behavior seems like it takes the nearest (by some criteria) point as a start and the farthest as the end, so i made one end of helix more distant from the body and it worked as you expect it. though it might still don't suit for your particular case

john_mcclary

Yea the (some criteria) is what's getting me. I've made this before and i couldn't get the part to pantern down. This time it's opposite. Maybe I should start an IR for flipping the direction

john_mcclary

https://forum.onshape.com/discussion/6454/reverse-direction-of-curve-pattern/p1?new=1

Link to IR

robert_morris

The original Curve Pattern FeatureScript written by Jon Sorrells  has an option to reverse the direction.
It has some other options that aren't in the official tool as well.

Link: https://cad.onshape.com/documents/572e1daae4b085edae52bf83/v/5450ca5527083685b67ddbd6/e/0de35a1a831305b2b691a995

john_mcclary

Thanks @robert_morris that featurscript is much better than the OS standard.

It's unfortunate the OS standard isn't anything near this script. This script is better than solidworks too