Calculating sine bar slips - Method B

Sine bar slips are usually given in the form of tables with standard sine chucks. But often lack of such tables drives engineers to calculate the required sine bar slip. This is a more direct method without the need to calculate any angles, it depends on known factors:

Because angle   has to be related as a sine function then the third side of the triangle needs to be solved:

To calculate for new ‘x’ using a given sine bar a second equation can be arrived to relate the sine of angle :

Relating to a triangle we now have:

Equations 1 & 2 relate to a common angle =sina°. A combining of equations now produces the formula:

Calculation example:

Find sine bar slip required to grind an inclined surface rising .100” over 11.5” using 16” sine chuck.