I have tapered end mill that I used to drill some tapered holes it is Marked 2 deg but is more than that.Is there some other way to figure the real deg.?
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Those tapered end mills how to calculate deg.
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Optical comparetor.
Plunge a hole and measure the depth of 2 different bearing balls, then do some trig to math out the angle.
Measure the cutter at 2 different points a known distance apart (calipers spaced via gauge blocks off surface plate) and math out the angle.
Side mill a piece of stock and measure the angle it cut.

One way of measuring a taper is to stand it vertically on a surface plate. Then put a matched pair of spacers/shims on each side of it to support the jaws of a caliper close to one end of the taper. Measure across the cutting edges at that height. Now use a second pair of spacers/shims to support the caliper jaws at a height near the other end of the taper and measure it there.
Distance A is the height of the higher shims minus the height of the lower shims.
Distance B is half the difference in the two readings.
The half angle of the taper is:
ArcTan(B/A)
Sorry, math content.
123 blocks are often used for the spacers/shims for longer tapers. Flat ground stock can be used for shorter ones: just measure it carefully.Paul A.
Make it fit.
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