Fig. 1635.

It is of importance that the Vs be planed as smooth as possible, and to enable this a stiff tool holder holding a short tool, as in [Fig. 1635] should be used, the holder being held close up to the tool box as shown. It will be obvious that when the head is set over to an angle it should be moved along the cross slide to plane the corresponding angle on the other side of the bed.

VOL. I.EXAMPLES IN PLANING WORK.PLATE XVIII.
Fig. 1636.Fig. 1637.
Fig. 1638.
Fig. 1639.

[Fig. 1636] represents a planer chuck by Mr. Hugh Thomas. The angle piece a is made to stand at an angle, as shown, for cylindrical work, such as shafts, so that the work will be held firmly down upon the table. The base plate b has ratchet teeth at each end c, into which mesh the pawls d, and has slotted holes for the bolts which hold it down to the table, so that it has a certain range of movement to or from the angle piece a, and may therefore be adjusted to suit the diameter or width of the work.

The movable jaw e is set up by the set-screw f and is held down by the bolts shown. The pawls d are constructed as shown in [Fig. 1637], the pin or stem s fitting the holes in the planer table and the tongue p being pivoted to the body r of the pawl. As the pawls can be moved into any of the holes in the table, the base plate b may be set at an angle, enabling the chuck to be used for taper as well as for parallel work, while the chuck has a wide range of capacity.

In [Fig. 1614] is shown a supplementary table for increasing the capacity of planer tables, and which has already been referred to, and [Fig. 1638] represents an application of the table as a chucking device. a, a, &c., are frames whose upper surfaces are to be planed. An angle plate is bolted to the planer table and the supplementary table is bolted to the angle plate. The first frame is set against the vertical face of the supplementary table, and the remaining ones set as near as possible, b, b, &c., being small blocks placed between the frames which are bolted to the planer table as at c.

In many cases this method of chucking possesses great advantages. Thus in the figure there are six frames to be planed, and as they would be too long to be set down upon the planer table, only three or four could be done at a time, and a good deal of measuring and trying would be necessary in order to get the second lot like the first. This can all be avoided by chucking the whole six at once, as in figure.

Another application of the same tables as useful chucking devices is shown in [Fig. 1639], where two frames e, f, are shown bolted to the machine table and supported by the supplementary tables t, which are bolted to the main table and supported by angle-pieces b, b. Work that stands high up from the planer table may be very effectively steadied in this way, enabling heavier cuts and coarser feeds while producing smoother work.