Fig. 928.
Fig. 929.
The amount of side rake may, however, be considerably increased if the heel d, [Fig. 928], be made higher than the point a in that figure, the plane of the middle being denoted by the arrow at a; a view of the other side of this tool is shown in [Fig. 929], the plane of the cutting edge being denoted by the dotted line.
A tool thus formed will require a slight cross feed screw pressure to force it to its cut, thus causing the cross feed nut to have contact with the sides of the thread in contact when winding the tool into its cut, hence the tendency to jump into the depth of cut is eliminated, and regulating the depth of the cut is much more easily accomplished.
In proportion as a tool is given side rake, it is more easily traversed to its cut, as will be perceived from the following:—
