Design table or equation, 4in pitch on diameter that changes

I have a large ring that changes in size there will be holes along the
circumference the pitch is 4.000 center to center around the complete
diameter what might be the best way so this updates, number of
instances?

design table or an equation. I

The file can be downloaded here 2006
href="http://www.filewire.com/download.php?id=cf634cb1c68a51d5b33656">110-15-002.SLDPRT
it can be sent back here if that is possible

thanks in advance
r

 

You need to determine if your requirement is to drive the diameter as a
function of the 4" center, or if the 4" dim is allowed to float in a range.
This will affect the structure of the part. Also, is the 4" a chordal dim,
or an arc length?

WT

 

I still havent got this figured out. this is going to be a clearnance
hole and the 4.00 dimension can be rounded up or down from the 4.0
inches so the spacing will be equal

what is the best way to do this?

Thanks in advance
R