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Circular Pattern - Angles Between Parts Irregular
james_alford
Member Posts: 17 ✭
I have drawn a single tooth on a gear wheel and then used the circular pattern tool to replicate it around the gear. I have set the parameters to repeat it 30 times around 30 degrees. For some reason, instead of 12 degrees between each tooth, I am getting 12.069 degrees for 29 teeth and 10 degrees for the final tooth. I have tried a number of times, including having construction lines to try and force the pattern to be as I want it, but with no success.
I have made the drawing public here: https://cad.onshape.com/documents/57342142e4b0682bde6506ef/w/7c1708cad8cf186dbc091a36/e/32f07689304ca0f99653da84
It is called "Clock - Workng Document - Copy" and the sketch is on the tab called "Part Studio 1".
Can anyone advise me how to make the gaps 12 degrees each?
hank you.
James.
I have made the drawing public here: https://cad.onshape.com/documents/57342142e4b0682bde6506ef/w/7c1708cad8cf186dbc091a36/e/32f07689304ca0f99653da84
It is called "Clock - Workng Document - Copy" and the sketch is on the tab called "Part Studio 1".
Can anyone advise me how to make the gaps 12 degrees each?
hank you.
James.
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Best Answer
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Optionsemmett_weeks
Onshape Employees Posts: 29
The sketch circular pattern can work in two different ways. If the end angle of the pattern is not changed before it is created, it will create a pattern with even spacing around a full turn. If the angle is changed, then it will create an open pattern with an angle dimension constraining it. You have the latter of these.
You can update the 350 degrees angle dimension in your sketch to 348 degrees to get even spacing for your 30 instance pattern. If you'd like the spacing to automatically update, you need to create a new pattern. The easiest way to remove the existing one is to either roll back in history or set the existing pattern count to 2 before deleting the patterned geometry and pattern constraint.1
Answers
I meant 30 times around 360 degrees, not around 30 dregrees.
James.
You can update the 350 degrees angle dimension in your sketch to 348 degrees to get even spacing for your 30 instance pattern. If you'd like the spacing to automatically update, you need to create a new pattern. The easiest way to remove the existing one is to either roll back in history or set the existing pattern count to 2 before deleting the patterned geometry and pattern constraint.
Thank you for this. I cannot say that I really understand the logic, but it has worked perfectly.
Regards,
James.
Why doesn't the tool allow us to "constraint" the angle and then add multiples afterwards?
The way to use this tool is not so intuitive, I am afraid