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/t5/illustrator/how-to-calculate-the-rotation-degree-of-tick-marks/td-p/4203794
May 21, 2012
May 21, 2012

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Hello Again,

Thanks to so much help that I received here, I've been able to move right along in learning how to perform my job digitally instead of with an old camera.

In my last discussion, I learned out to make the tick marks using copies and rotation. My question now is, how is the rotation calculated so A) I get the correct placement of the tick marks, especially the small ones as there are so many and B) how do I calculate the rotation degree so that I have the proper amount of space at the bottom of the guage/dial?

Here is an image to help show what I'm asking:

I know how to get the large tick marks and the small tick marks, if I were placing them evenly around the entire circle, I would know how to do that also - but since I'm placing them around only a portion of the circle (although still evenly) I'm lost. I can only figure out the space by hit and miss calculations and that is taking much too long. I would also need to know how much to rotate the entire thing by in order to get the open space at the bottom as shown.

thanks for your help!

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May 21, 2012
May 21, 2012

well lets say you want a 90° gapand need 100 marks. then: 360° - 90° (270) / 100 = 2.7 so copies 100 angle 2.7and need 20 marks then it will be 270 / 20 = 13.5 angleG

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/t5/illustrator/how-to-calculate-the-rotation-degree-of-tick-marks/m-p/4203795#M190913
May 21, 2012
May 21, 2012

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You need to use transform effects and you can get this in about 10 or so minutes.

first you need to set up the objects.

the thick lines I used effect>distort and transform>transform 20 copies angle 14

thi ones 100 copies angle 2,8

G

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Jber505
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/t5/illustrator/how-to-calculate-the-rotation-degree-of-tick-marks/m-p/4203796#M190914
May 21, 2012
May 21, 2012

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Hello Grant,

Thank you so much. Yes, I know how to figure out the number of copies that I need. What I need is how you were able to calculate "angle 14" for the thick lines and "angle 2.8" for the thin ones. Its the actual calculation of the rotation angle that I need to know. I would assume it's something like 360/12 or something but I just don't know.

Thanks again.

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/t5/illustrator/how-to-calculate-the-rotation-degree-of-tick-marks/m-p/4203797#M190915
May 21, 2012
May 21, 2012

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well lets say you want a 90° gap

and need 100 marks. then: 360° - 90° (270) / 100 = 2.7 so copies 100 angle 2.7

and need 20 marks then it will be 270 / 20 = 13.5 angle

G

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/t5/illustrator/how-to-calculate-the-rotation-degree-of-tick-marks/m-p/4203798#M190916
May 22, 2012
May 22, 2012

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