Compound sine bar and method of setting an angle in a lathe

Details Compound sine bar and method of setting an angle in a lathe Compound sine bar and method of setting an angle in a lathe

1986-06-02

1987-03-24

Martin, Jr., William D.

Geometrical instruments

Gauge

Angle

33185R, G01B 318, G01B 330

Patent

active

046514350

ABSTRACT:
This discloses an improved sine bar for accurate measurement of angles for machining operations, and methods of its use. This comprises a rectangular elongated base member, projecting from opposite ends of which are cylindrical connecting rods. A conforming reference bar is hingedly connected to the base member, and has a cylindrical bearing pin fastened beneath one end. When the sine bar is open to accommodate one or more calibrated gauge blocks, a spring-biased chain keeps the gauge block(s) in position between the base member and the bearing pin. A recess in the base member permits measurement of small angles. This device is especially adapted for use in setting up a lathe compound to calibrated angular positions, but is also useful for other types of milling and machining operations in which the sine bar rests on a flat surface.

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