Fig. 1999.
[Fig. 1999] represents Slate’s fixture for this class of work. a is a stand that bolts upon the slideway d in [Fig. 1992]. Upon a is fixed a rectangular bar b, upon which (a sliding fit) is the shoe c. Upon c fits the piece d, which is pivoted to shoe c by the pin at e. At the other end of d is a lug, against which abuts the end of screw g, which is threaded through the end of c, so that by operating the screw g, d may be set to any required angle upon c, and at f is a set-screw threaded through d and abutting against c, so as to lock d in its adjusted position. At p is a pointer for the graduations on c, which are marked to correspond with the graduations upon the taper turning attachment of a lathe.
The work is held between centres, the head h fitting to a slideway on the top of d, and being secured in its adjusted position by the screw i. The work should obviously be set so that its upper face lies horizontal, and is fed to the wheel by moving shoe c by hand along bar b, the long bearing keeping c steady, and the lightness of the moving parts making the feeding more sensitive than it would be were it required to move bar b.
The tooth being ground is held by hand against the gauge g in [Fig. 1994], as was described with reference to that figure, and the reamer, therefore, in the case of having spiral grooves, revolves upon its centre while being fed to the emery wheel.
Fig. 2000.
