How to make a timing tape

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 Once the circumference is known, 1/10 (10%) of this figure represents 36 degrees. Half of that is 18 degrees, half again is 9 degrees, etc. It doesn't matter what units are used to measure the circumference- metric, inch, or nanoparsec's.
-If you like precision, you can go this way, measure your damper's diameter, let's say it's 8 inches, first find the circumference, multiply 8 X 3.1416 = 25.1328, now to use a more accurate measuring system let's go metric, multiply your circumference of 25.1328 inches times 25.4 to convert to millimeters, which would be 638.37mm, now divide this by 360 and you'll get 1.77, this means that a mark on the tape of 1.77mm equals one degree, 17.7mm would be 10 degrees.
+If you want to use the metric system, multiply the circumference by 25.4 to convert to millimeters. Divide this by 360 and you'll get the measurement in millimeters that equal one degree.
 When marking your home-made tape, starting from "0", BTDC will be to the right, ATDC to the left of "0".

Revision as of 11:56, 18 November 2011