Sine Bar Calculator

Inputs

Solve for

Choose whether you know the angle (find the stack) or the stack (find the angle).

Sine bar length (L)

Standard sine bars are 5 in (127 mm), 100 mm or 200 mm.

Angle (θ)

Angle the sine bar is set to, measured from the surface plate.

Default result

Gauge stack height(h)

50mm

Stack of gauge blocks under the raised roll, h = L·sin θ.

Also computed

Angle(θ)30°

Angle of the sine bar from the surface plate, θ = asin(h/L).

Method notes 3 notes

Gauge stack h = L · sin θ — the roll-centre length times the sine of the set angle.
L is the roll-centre distance (centre-to-centre of the two rolls), not the overall bar length.
Use slip (gauge) blocks wrung into one stack and check on a flat surface plate; the bar must be clean and burr-free.