Sine Vises, Bars & Plates

Last updated on Saturday, February 13, 2021 05:36:45 AM Mountain US Time Zone

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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.

 ANGLE CALCULATIONS
Size of Gauge Block = Sine (A) x D

Resultant Angle = Arcsine (S/D)

Where: A = Angle in degrees
D = Distance between rolls
S = Size of gauge block (inch or mm spacer)

Notes: The calculator must be set to degrees not radians or rads.

MS Excel spreadsheets default to radians where 1 radian ≈ 57.2958 deg thus the
 formula to calculate the sine of 30 degrees would be: =sin(30/57.2958) which equals 0.5.
If the roll distance is in inches (or mm) then the required spacer size is in inches (or mm).

For example, if you need to set a 30 deg angle & the
distance between the rolls is 5.0000" (127mm), calculate the
sine of 30 deg, which is 0.5, then multiply by 5.0000"
(127mm). The size of the spacer is exactly 2.5000" (63.5mm).
 Sine bars & plates 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.

 
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Gauge Blocks

81 piece, Grade B; +/- 0.000050" at 20 deg C (68 deg F),
rectangular precision gauge block set, from 0.050 to 4.0".
Example of a calibration reference table.
See this Starrett document for info on wringing gauge blocks.

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

Sine Bars

3" between rolls sine bar that is
only a 1/4" thick; hardened HSS.
Using the formula, the sine bar angle is
at 7.66225566 deg or 7 deg 39' 44.12"

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

A 5" sine bar set at 10 deg.
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.

 
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Sine Plate

1/4-20 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,
Gauge Blocks, Sine Bars, Sine Plate

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