Device for automatic measurement for engagement pitch of the thr

Details Device for automatic measurement for engagement pitch of the thr Device for automatic measurement for engagement pitch of the thr

1980-07-10

1981-06-30

Little, Willis

Geometrical instruments

Gauge

Screw thread

33199R, 331795R, G01B 728

Patent

active

042755077

ABSTRACT:
The device for measuring the engagement lead of the thread of a screw-like work piece, such as a hob, for example, includes a spindle for rotating the work piece about an axis, a measuring slider movable transversely to the axis and terminated with a feeler which is in sliding contact with a flank of the thread of the work piece whereby the path of movement of the measuring slider is angularly adjustable, a sliding carriage supporting either the measuring slider or the work piece to impart a relative axial displacement therebetween, a tachometer generator coupled to the axially movable sliding carriage to generate a signal proportional to the speed of the axial displacement, a sinusoidal potentiometer mechanically coupled to the measuring slider and to an angle measuring and adjusting device to adjust the angular position corresponding to the base lead angle of the thread of the work piece, the output of the tachometer generator being connected via the sine potentiometer to the electromotor for dirving the measuring slider so that the transverse feed of the latter is proportional to its relative axial displacement whereby the deviations from the preset lead angle are continuously recorded.

REFERENCES:
patent: 2992491 (1961-07-01), Hofler
patent: 3122839 (1964-03-01), Muller
patent: 3324562 (1967-06-01), Kelso
patent: 3945126 (1976-03-01), Bloch
patent: 4170830 (1979-10-01), Weber

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