[Figs. 3212] to [3215] represent a machine by J. S. Graham. The frame b, b, [Fig. 3213], of this machine is cast in one piece cored out, and the base is wide, so as to give necessary solidity. The hollow column is fitted with a door w, and shelves v, v, forming a very complete case for the reception of tools, cutters, etc. The spindle boxes and slides c are one casting. They are planed on centres and held in the frame b′, [Fig. 3215], by large gibs l, and sliding surfaces shown in c′, [Fig. 3214]. They are adjustable vertically by hand wheels k, in front of frame in connection with nut o, as shown in [Fig. 3214], and require no lock to hold them at the proper height.
Fig. 3214.
Fig. 3215.
The cap o′ ([Fig. 3213]) has an oil chamber j and wick which feeds the oil to the upper bearing. The lower box is fitted with a patent self-oiling and adjustable step shown at a, b, c. The cap a, upon which the spindle d rests, has a small opening in the centre. The circular block b, under it, also has a hole in the centre. The bolt d has two holes in it, one horizontal and the other vertical.
The chamber surrounding this step and cup is filled with oil. The motion of the spindle d on the cap a causes the oil to flow from the chamber through the openings to the spindle. Thus the oil is kept in constant circulation. The end of this spindle d is by this arrangement kept always lubricated.
The spindles d are of 17⁄8 hammered tool steel accurately turned and fitted in the boxes, which are of extra length, and lined with the best genuine Babbitt metal. They are 30′′ from centre to centre, and have independent screw tops, as shown at s, enabling the operator to use various sizes for large or small work, or clear the table of either spindle for special work.