169
No. 6 Large
Patent Car Mortising and Boring Machine.
Witt Graduated Stroke, Automatic Chisel-Keverser, and Auxiliary Boring Attachments.
This is regarded as the most powerful and complete reciprocating mor-tiser yet constructed. It is thoroughly adapted to the heaviest and most diffi-cult classes of car and bridge work. The column is massive and strong, thebase plate is extra large, insuring permanency and rigidity upon the floor whereplaced without vibration. It is self-contained, and requires no attachment ofweights, treadles, etc., to the building. Its capacity is to receive timber 17"square, and make a mortise to the center of 14", and 7" deep, or, by changingthe face of the stick, it can be made to work clear through.
The chisel-bar has a perfectly graduated stroke, commencing at a still pointabove the extreme upper throw and working gradually down into the mortisewith little or no perceptible jar and under perfect control of the operator. Thechisel-bar has our patent automatic reverser, which acts upon IK" movement.It locks the chisel-bar and holds it always in position; it is simple and alwaysready and reliable. The bed is very heavy and fitted with screw clamp for hold-ing the material.
The bed is supported on a central screw, by which means the thrust or blowof the chisel is terminated to the foundation, and does not fall upon the tablebracket. It has a vertical adjustment to suit the depth of mortise, also a cross-wise adjustment to regulate the position of the mortises to be made. Thereare two boring attachments; one on the line with the chisel for the mortise,which will bore to 10" from the center of column; and upon the opposite sidean adjustable auxiliary boring spindle for bolt holes, which will bore through17" timber.
By a peculiar mechanism both the regular and auxiliary boring attach-ments are driven by one belt, and each can be started or stopped independ-ently of the other, dispensing with the necessity of a separate countershaft. Wefurnish with each machine nine chisels and augers to correspond, viz.: K">
1", 1%", IK", and IK"; also, long augers for boring joint bolts, T %, rl-
Especial attention is called to the fact that every joint in the graduatedmovement is bored and turned, and is compensating, while there is not a piecethat will not last years with care.
The tight and loose pulleys are 16"x4", and should make 275 revolutions.