TC 9524
APPENDIX C
FORMULAS
SINE BAR OR SINE PLATE
SETTING
Sine bars or sine plates usually have a length of 5 inches or 10 inches. These standard lengths are commonly used by the tool
maker or inspector. The sine bar or sine plate is used for accurately setting up work for machining or for inspection. Gage
blocks are usually used for establishing the height.
Rule for determining the height of the sine bar setting for a given angle: multiply the sine of the angle by the
length of the sine bar. The sine of the angle is taken from the tables of trigonometric functions.
Problem:
What would be the height to set a sine bar for establishing an angle of 230 41‘?
Solution:
The sine of 23’41‘ is
0.40168. Multiply this by 5 because a 5inch sine bar is used; 5 x 0.40168 = 2.0084, which is the height to set the sine bar.
TO FIND
Taper per inch
Taper per foot
Taper per foot
Diameter at small
end in inches
Diameter at large
end in inches
Distance between two given
diameters in inches
Amount of taper in a certain
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 Spring '10
 WETTON
 Taper, sine bar

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