Is there an accurate method of measuring the center cut of a riser?
What kind of rise? one piece or take down? For a take down I use a adjustable square. Line up the square with the center alignment pins then measure from the opposite side of the sight window on the back of the bow. I guess you could do the same with a one piece. adjust from each side until you find center.
Use a caliper or micrometer to measure the riser width thickness at it's widest several inches above and below the arrow shelf. Then measure the thickness at the center of the shelf, or wherever it's widest if it's crowned. Will need to take off the strike plate material for an accurate measurement, or subtract its thickness from your measurement.
Subtract that result/number from the average of the first two, if they're different. The amount that number is more or less than half the width of the riser is the amount it is cut proud of or past center.
Doesn't work if the arrow shelf area is off center, i.e., built out on one side of the bow as many metal ILF risers.
On a 3 piece riser, run a string from center of limb bolt to center of the limb bolt and measure to the sight window from the string. It will get you real close.
Mike
If there is no obvious center mark on the limbs to align with, put pieces of white adhesive tape or some such on the top and bottom limbs and mark the center of each limb on the pieces of tape. String the bow and hang it from a peg or something such that you can stand on the string side and sight align the string with the marks on the tape. While keeping the string aligned on the marks, you should be able to see how much the strike plate is cut shy of or past center.
A laser level or devise could work also couldn't it? Not many folks have one but I wonder if that would do the job as well?
Aligning the beam so it hits center of each limb tip and having the red line following the length of bow from tip to tip.