Fig. 2043.
This difficulty may be overcome by recessing the wheel face, as in [Fig. 2043], in which the wheel is shown in section.
Fig. 2044.
In some cases, as for grinding the knives for wood-working machines, hollow cylindrical wheels, such as in [Fig. 2044]. are used, the duty being performed on the end face b b of the wheel, and the work being traversed in the direction of the arrows. The wheel is here gripped between the flange f and the collar c, which fits accurately to the end of the driving spindle s, so as to be held true, and secured by screws passing through c and into f, or the end of s may be threaded to receive a nut to screw against c.
