Grinding machine with a method for securing dimensional accuracy

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Description will now be given on preferred embodiments of a grinding machine incorporating an improved dimensional accuracy securing device according to this invention in conjunction with the accompanying drawing.
Referring now to FIGS.
1 and 2, there is shown, by way of a first embodiment, a grinding machine according to this invention which comprises a grinding wheel 1, a work to be ground to be an accurate cylinder 2, and a dimensional accuracy securing device 3.
In these figures, a dot-and-dash line 1 represents a position of the grinding wheel 1 prior to its feed into its grinding position, while a full line 1 shows a position of the grinding wheel when a grinding operation is completed.
Likewise, a dot-and-dash line 2 represents a position of the work 2 before it it ground, while a full line 2 shows a position of the work when the grinding operation is completed.
According to this invention, the dimensional accuracy securing device 3 is generally placed on the side of the work 2 to be ground, that is, disposed in such a relationship that a diamond unit 4 operatively mounted in the device 3 may oppose against the direction of feed P of the grinding wheel 1, while a diamond tip 5 of the diamond unit 4 being set at a position of finish length or distance "1".
With this setting position called as "reference A", it is required to constantly keep the diamond unit 4 at this reference A position during a grinding operation cycle, while enabling the diamond unit 4 to be fine-fed with respect to the reference A according to changes of the grinding conditions.
In a practical construction, for instance, there is provided a rest or support 6 having a screw guide 7 therein, and a holder 8 for the diamond unit 4 is placed upon the screw guide 7 in such a manner that it may be adjustably shifted forwardly or backwardly together with the screw guide.
There is also provided a lock screw 9 adapted to fix the diamond holder 8 in a selected position, and a microfeed mechanism 10 of a micrometer is operatively connected to the diamond holder and the like