Fig. 2009.
To eliminate this curvature it would appear that the position of the emery wheel might be reversed, as in [Fig. 2008], but as the emery wheel would wear only where in contact with the tooth, it would gradually assume the shape in [Fig. 2009], there being a shoulder at s that would destroy the cutting edge of the tooth.
Fig. 2010.
Fig. 2011.
This may to a great extent be remedied by presenting the cutter diagonally to the wheel, as in [Fig. 2010], employing a wheel so thin that the whole of its face will cross the tooth top during a revolution. Or if the side faces of the wheel be recessed, leaving only a narrow annular grinding ring at the circumference, the wheel might be mounted as in [Fig. 2011], thus making the top of the tooth quite flat. It may be observed, however, that the usual plan is to revolve the wheel at a right angle to the work axis, as was shown in [Fig. 1994].
In grinding cutters having their teeth a right-hand spiral, care must be taken that in grinding one tooth the emery wheel does not touch the cutting edge of the next tooth.