DianneB wrote: ↑Wed Apr 10, 2019 5:13 am

SteveM wrote: ↑Tue Apr 09, 2019 12:53 pm

Instead of laying out the circle with angular movement, just use the X/Y coordinates of each hole.

You must have a CNC machine or a great love of Trig!

My milling machine is calibrated in Metric and I am working in Imperial so I'd rather NOT do so much math!

Actually, the little machine shop calculator does the metric for you. You would only need to convert the circle diameter, the starting X/Y coordinate and (for some reason) the hole diameter.

So, for a 4-1/2" 5-hole circle, it calculates the following coordinates in millimeters (assuming that 0/0 is the center of the circle):

1 0° X = 57.1500 Y = 0.0000

2 72° X = 17.6603 Y = 54.3529

3 144° X = -46.2353 Y = 33.5919

4 216° X = -46.2353 Y = -33.5919

5 288° X = 17.6603 Y = -54.3529

Some of you may recognize this as the bolt pattern for a Toyota.

At least you don't have to work in radians!

Steve