Sine Vises, Bars & Plates

Last updated on
Saturday, February 13, 2021 05:36:45 AM
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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
CALCULATIONSSize 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