US 4,378,160 A · Method and apparatus for dial indicators calibration

Abstract

A method and an apparatus for dial indicator calibration comparing the real displacement of the dial indicator rod with its ideal linear displacement during each calibration interval given by the dial indicator hand, having a Michelson interferometer with a laser as a linear displacement transducer, an opto-electronic transducer to read the dial, indicator hand position for each calibration interval, an electronic control urgent which controls the operation of the whole apparatus and feeds to a printer the measuring errors in length units and the corresponding calibration intervals.

Claims5

Dependent claims

A method of calibrating a dial indicator which comprises the steps of:

(a) automatically generating a succession of pulses representing the displacement of a dial indicator pointer resulting from the displacement of a rod thereof;
(b) displacing said rod back and forth over a calibration interval;
(c) interferometrically measuring the displacement of said rod and generating a plurality of pulses representing the displacement thereof;
(d) comparing the pulses produced in steps (a) and (c) and generating the signal representing a difference between the reading of said pointer and the displacement of said rod;
(e) storing said signal;
and
(f) displaying the stored signal.

4 more elements

Dependencies are inferred from the claim text.

Method and apparatus for dial indicators calibration

Life of this patent

Method and apparatus for dial indicators calibration

Life of this patent

Abstract

Claims5