Grinding machine and measurement device

Abstract

A grinding machine, wherein a first grindstone head is provided to a machine base frame (10) with a first movement body (11A) and a first grindstone base (12A) provided therebetween. The base end of a tilting arm (28) is tiltably fitted to the housing of the grindstone head. A measuring instrument (41) is rotatably connected to the tip of the tilting arm (28). A gage (46) and a measuring pin (47) are connected to the lower end of the measuring instrument (41), and the gage (46) is engaged with a crank pin (23a) of a crankshaft. The center (O28) of tilting of the tilting arm (28) is set on the same axis as the center (O15) of rotation of the first grindstone (15A). Even if the tilting arm (28) is tilted to change the position of the measuring instrument (41), the positional relationship between the first grindstone (15A) and the gage (46) does not change, and this enables the position of the gage (46) to be easily adjusted according to the diameter of the crank pin (23a). As a result, the trajectory of movement of the gage of the measuring instrument is simple and the outer diameter of the workpiece can be measured quickly.

Description

Grinders and their measuring devices technical field The present invention relates to a grinding machine for grinding a workpiece such as a crankshaft, and more particularly to a grinding machine having a measuring device for measuring the outer diameter of a cylindrical portion of a workpiece such as a crank pin, and such measuring device. Background technique The grinding machine has a measuring device which measures the outer diameter of the cylindrical part of the workpiece, so as to monitor the grinding state of the cylindrical part by the grinding machine. There is a grinder measuring device with a disclosed structure, for example, it has been proposed in Japanese Patent Application Publication No. 2007-185768. This grinding machine will now be described with reference to FIGS. 24 and 25 . The rotating shaft (103) of the motor (not shown in the figure) is fixed on the upper surface of the reciprocating grinding base (101) through the pillow (102). The grinding st...

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