Fig. 50 shows a gage for use in grinding drills, which has been found very handy and accurate. This gage enables either a large or small drill to lie solidly in the groove provided for it on top of the gage, and the lips can then be tested for their truth in width, or angle, much easier and quicker than with the gages in common use without the groove. There is a line, to set the blade B by, on the stock at an angle of 59 degrees at the top of the graduated blade, and the user can easily make other lines, if needed for special work. The blade is clamped in position by the knurled nut N at the back, and can be thus adjusted to any angle. The stock A is cut away where the blade is pivoted on, so that one side of the blade comes directly in line with the middle of the groove.[[28]]
Tool for Gaging Taper Threaded Holes
Fig. 51. Tool for Gaging Taper Threaded Holes
The tool shown in Fig. 51 is used for gaging taper threaded holes in boilers when fitting studs. It is a simple, though very useful and economical tool, and it will doubtless be appreciated by those having much work of this kind to do. The hole in which the stud is to be fitted is calipered by filling the threads of the plug with chalk, and then screwing the plug in the hole. When the plug is removed the chalk will show exactly the largest diameter of the hole.[[29]]
Contour Gage
Fig. 52. Setting Contour Gage to Turned Sample
Fig. 53. End View of Contour Gage