Quote:
Originally Posted by vanjast
Could never find one... Even tried excel charts, but the resolutions were 'dodgy'
Had to resort to linear image 'dot and rotate' in photoshop = Manual Labour.
But it worked. You could also try circularise a linear image in photoshop... I haven't tried this, as i think the resulting accuracy might not be right.
i was even thinking of a CNC machine to make circular disks like this. 
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The only way I have done it is "brute force." I used Excel to create a table translating linear distances to degrees. Then I used Adobe Illustrator to rotate a circle and make scale marks at the zero point. Finally, I converted the stroke graphics to pixels by loading into P'shop, and saved it as a Targa.
It's easier to build the image in AI than in P'shop, but it's still all hand work.
Illustrator will convert a rectangle into a circle. (It will even convert a line into a circle.) But the scale marks do not go along for the ride.