Circular feature pattern not working as expected

david_fisher031

I am trying to get an axis to transform my gears around. I used a circular pattern to create copies of the gear parts but when I try to do the same using a circular feature pattern for a line construction it doesn't pattern as I would expect, being much nearer to the axis than the feature I am trying to pattern. I have tried to replicate this in a simpler example but can't.
Here is the model it is Circular Pattern 2 that I am referring to.
https://cad.onshape.com/documents/57b06da9e4b0f8ff2a92134e/w/ac5aeb414bf9e2c16fc21890/e/d458883e10045907e819d885

øyvind_kaurstad

I think you mean Circular Pattern 3 (not 2). The problem is that you are patterning a sketch, and the sketch isn't constrained with a fixed distance, instead you have a "Use" constraint. This is also reflected in the pattern, giving you a wrong distance.

If you instead use a distance constraint towards the origin in Sketch 17, like so:



...then the pattern will use this distance, and you get what you expected. However, this isn't very robust, since it will only work as long as the axis you're patterning around goes through the origin.

Patterning sketches seems to be quite tricky.  :-)

øyvind_kaurstad

I think you mean Circular Pattern 3 (not 2). The problem is that you are patterning a sketch, and the sketch isn't constrained with a fixed distance, instead you have a "Use" constraint. This is also reflected in the pattern, giving you a wrong distance.

If you instead use a distance constraint towards the origin in Sketch 17, like so:



...then the pattern will use this distance, and you get what you expected. However, this isn't very robust, since it will only work as long as the axis you're patterning around goes through the origin.

Patterning sketches seems to be quite tricky.  :-)

david_fisher031

>I think you mean Circular Pattern 3 (not 2). 

Yes you are correct, sorry for getting that wrong.

> However, this isn't very robust, since it will only work as long as the axis you're patterning around goes through the origin.

It should work for me in this instance anyway.

>Patterning sketches seems to be quite tricky.  :-)

Yes, and to remember that you're patterning a sketch rather than just a feature.

Thanks for taking the time to answer my question :-)