JOINTING MACHINE.
“Jointing” a piece of wood or timber, means producing a surface, so that the joint between two pieces that are to come together or be glued shall be close. In order to produce surfaces that shall be true enough for this purpose, it is necessary that the work be held in such a way that it is not sprung or deflected by the holding devices or feeding apparatus.
Fig. 3208.
[Fig. 3208], for example, represents a jointing machine, in which the work abuts against an inclined plate p at one end, while the other end is clamped down to the table, which is traversed past the revolving head h, to which are secured two gouge-shaped cutting tools, one of which is seen at t. By using tools of this class, the amount of cutting edge in action is small, and will not therefore spring the work, and if the cutter spindle is adjusted to have no end motion, the work will be true, notwithstanding any slight vibration of the head, because its plane of revolution coincides with the plane of the surface being surfaced or jointed.
Fig. 3209.
In some jointing machines, knives are set on the face of a revolving disc, an example of this class of machine being shown in [Fig. 3209], which is for facing the spokes of wheels and for finishing the mitre joint on them.