Arc Pattern - Chord Length

'Sup Dale!

Should be a way to "math" it using the diameter and perimeter of that diameter, say, as parameters.  I'm swamped or I'd look into it for ya.

To be honest, I don't quite get the dimension schema for your pattern; lol, the only thing I think I understand is that the patterned hole centers are 4" apart.

But I was going to suggest that instead of "manual calculation", you create a sketch which computed the necessary axial-pattern angle, such as this:

for a given radius (R=9.223" in this case), and with the chord spacing of 4", the necessary angle is displayed in the reference dimension of 25.049° - and that reference dimension can be used in the relations that drive the subsequent axial pattern...

Let me break down into a couple of things:

Is  there a way to simply define the location of the first hole. It is a combination of X, Y and R, Θ.

I have a 6" horizontal offset from the vertical centerline. I also have a radial dimension from a point a that same centerline.

Without creating sketch geometry, defining a point and then putting the hole on that point, I could not find a simple way to define the hole location. After setting the horizontal dimension, I would click on the center point and Creo would default to a vertical dimension and not radial. If I chose a radial dimension first, Creo would not let me chose the vertical centerline for a second dimension.

The second issue was trying to determine the possibility of defining a pattern by chord length instead of angle. The holes are the same chord length apart, the angle dimension changes as the radius get larger from row to row. Can you define a pattern by chord length?

Yes this all can be done by sketches or math, but I am just trying to figure out the possibilities of the software. Why do it the long way if there is a shorter method that could be utilized of which I may not be aware.