Sine Vises, Bars & PlatesLast updated on Sunday, September 07, 2014 06:14:59 AM Eastern US Time Zone

HOMEAngle Calculations, Sine Vises, Gage Blocks, Sine Bars, Sine Plate

Sine vises
& bars allow quick & very accurate angle setting using precision spacer
blocks.

The distance between the roll centers is
quite accurate as are the other
dimensions.

All of these sine vises & bars
were hardened then precision ground to close
tolerances.

Required spacer size = Sine (Desired angle°) x Distance between rolls

Resultant Angle° = Arcsine (Spacer size / Distance between rolls)Notes: The calculator must be set to degrees not radians (rads).

MS Excel spreadsheets default to radians where 1 radian ≈ 57.2958° thus the

formula to calculate the sine of 30°would be: =sin(30/57.2958) which equals 0.5.

If the roll distance is in inches (or mm) then the spacer size is in inches (or mm).For example, if you need to set a 30º angle & the distance between the rolls is 5.0000" (127mm), calculate the

sine of 30º, which is 0.5, then multiply by 5.0000" (127mm). The size of the spacer is exactly 2.5000" (63.5mm).

Sine bars are used in the same manner. For a given length sine bar & spacer block size

you can also calculate the resultant angle. This calculation is the same as that for tapers.

Sine Vises

2-in & 3-in wide sine vises; both
are 4" between rolls.
Sine vise
instruction manual. See
more vises.

Close-ups of the 2-inch sine vise.

Sine vise with a precision spacer block.

Underside showing the 4" center-to-center rolls.

Gage Blocks

81 piece, Grade B;
±0.000050" at 20°C (68°F), rectangular precision gage block set, from 0.050 to
4.0".

Example of a calibration reference table.
See this Starrett document for info on
wringing gage blocks.

Low-cost spacer gage set useful in
setups. The gage block set has many more step sizes for the sine vise.

Sine Bars

3" between rolls sine
bar that is only a ¼" thick.

Using the formula, the sine bar
angle is at 7.66225566º or 7º
39'
44.12"

Assorted types & sizes (3" & 5" between the rolls) of sine bars.

A 5" sine bar set at 10°. The 1" insert vise is wider than
the bar thus it is clamped when the jaws are closed.

The insert vise jaw is smaller than its base allowing parts to be exchanged
without disturbing the entire setup.

2-inch screwless vise on the sine bar.

Sine Plate

¼-20 flathead screws can be used to hold certain types of
parts to the sine plate. 5" between rolls & hardened.

One-inch vise adapter for the sine plate using
MIC-6 aluminum.

Angle Calculations, Sine Vises, Gage Blocks, Sine Bars, Sine Plate