Fig. 1021.
[Fig. 1019] represents a side view of Woodbridge’s tool holder at work in the lathe, and [Fig. 1020] is a view of the same set at an angle to the tool rest. [Fig. 1021] is an end view of the tool and holder removed from the lathe.
The tool seat a is at an angle of about 4 degrees to the base of holder (a greater degree being shown in the cut for clearness of illustration), so that the side j of the tool will stand at an angle and have clearance without requiring such clearance to be produced by grinding. The seat b of the cap c upon the tool is curved, so that the cap will bind the middle of the tool and escape the edges, besides binding the tool fair upon its seat a. The top face is formed at the angle necessary for free and clean cutting, and the tools are, when the cutting edge is provided at one end only, hardened for half their length.
The holder, and therefore the tool, may obviously be swung at any chosen angle of the work or to suit the requirements.
Fig. 1022.
[Fig. 1022] shows a right and left-hand diamond-point tool in position in the holder with the cap removed, the cutting edge being at g, the angle of the top face being from f to e. The tool, it will be observed from the dotted line, is supported close up to its cutting corner.