WOOD BORING MACHINES.
The rapidity with which holes may be bored in wood enables the feed to be most expeditiously performed by hand or by foot motion. A foot motion leaves both the workman’s hands free to adjust and change the work, and is therefore suitable for light work or work having holes of a moderate depth.
The work tables of wood boring machines are provided with suitable fences for adjusting the work in position, and in some cases with stops to adjust the depth of hole.
Any of the augers or bits that are used in boring by hand may be used in a boring machine, but it is obvious that, as the bit or auger is forced to its feed by hand or foot, and as its revolution is very rapid, the screw point, which is intended as an aid in feeding when the bit is used by hand, is not necessary. On this account most augers for use in machines are provided with triangular points instead of screw points.
Fig. 3222.
In [Fig. 3222] is shown a wood boring machine by J. A. Fay & Co. The table is gibbed to a vertical slide on the face of the column, and is adjustable for height by the hand wheel a, which, through the medium of its shaft and a pair of bevel gears, operates the elevating screw b. The spindle c feeds through its bearings, the supporting rod d being pivoted at its lower end to permit c to feed in a straight line vertically. The feeding is done by the treadle f, which operates the rod e.
The table may be set at an angle of 30 degrees from the horizontal position.
The weight w counterbalances the treadle and brings it to its highest position when the workman’s foot pressure is removed.