Fig. 2048.
Another method of grinding flat surfaces is to mount the emery wheel beneath a table t in [Fig. 2048], letting the top of the wheel emerge through an opening in the table, and sliding the work upon the trued upper surface of the table. The surface of the table thus becomes a guide for the work. To obtain true work in this way, however, it is necessary that the cut taken by the emery wheel be a very light one, as will be perceived from the following considerations.
Fig. 2049.
Fig. 2050.
