A month or so back I needed help with laying out 3 bolt holes for a project. The long and short of it stirred up some great help by the group, and MARV KLOTZ chimed in with a calculator formula. I am hoping to get some hand holding help here with how exactly I need to enter this into my calculator, because I am not getting the right numbers it seems.

For example, here is the formula that Marv posted:: The center-to-center distance is referred to as the 'chord'. If that's known, then calculate the 'angle' between adjacent bolt holes as:

angle = 360 / (number of bolt holes)

Then the bolt circle radius is given by:

radius=0.5*chord/sin(0.5*angle)

Regards, Marv