Fig. 46. Handy Taper Gage
A handy taper gage is shown in Fig. 46. The blades of the gage are made of tool steel. The edge of the blade A is V-shaped, and the blade B has a V-groove to correspond. The end of B is offset so as to make the joint and allow the two blades to be in the same plane. A strong screw and nut are provided to hold the blades at any setting. The user of this gage looks under the edge of A, and is thereby enabled to tell whether the taper coincides with that set by the gage, and also where a taper piece needs touching up to make it true.[[24]]
Test Gage for Maintaining Standard Tapers
Fig. 47. Test Gage for Maintaining Standard Tapers
In steam injector work, accurately ground reamers of unusual tapers are commonly required, and the gage shown in Fig. 47 was designed to maintain the prevailing standard. It consists of a graduated bar, 1 inch square, with the slot F running its entire length. The stationary head A is secured in position flush with the end of the bar, and the sliding head B is fitted with a tongue which guides it in the slot. This head may be secured in any desired position by means of a knurled thumb nut. The bushings D and D′ are made of tool steel, hardened and ground to a knife edge on the inside flush with the face. All bushings are made interchangeable as to outside diameter.
The head B is fitted with an indicating edge E which is set flush with the knife edge of the bushing. The reading indicates to 0.010 inch the distance the bushings are from each other, and the difference in their diameter being known, it is easy to compute the taper. With this gage it is possible to maintain the standard tapers perfectly correct, each reamer being marked with the reading as shown by the scale.[[25]]
Inside and Outside Adjustable Gages
