Handbook of small tools, comprising threading tools, taps, dies, cutters, drills, and reamers by Oberg Erik 1881-

Author:Oberg, Erik, 1881-
Language: eng
Format: epub
Tags: Machine-tools
Publisher: New York, J. Wiley & sons; [etc., etc.]
Published: 1908-03-25T05:00:00+00:00

Fig. 121. Inseited Blade Pipe Tap

is shown. Here the chasers are held in place by means of taper pins which wedge the metal of the body firmly against the blade. The correct location of the blades in a longitudinal direction is obtained by means of a ring held to the body by screws. It is plainly seen from the construction that this tap is not intended to be adjustable, but is simply made with inserted blades from an economical point of view. This design being most commonly used for large taps affords a considerable saving in material. The tap shown in the cut is provided with interrupted thread as commonly used on pipe taps and taper taps in general.

Another form of inserted blade tap is shown in Fig. 122. The blades are here held in place by means of a ring threaded on the inside to fit the thread of the blades or chasers, and split and provided with binding screws so as to make possible a positive grip over the blades. The advantage of this design is that the threads of the vari-

SMALL TOOLS

ous chasers must necessarily be so located as to form a continuous helix all around the tap, inasmuch as the threaded ring fits upon the thread in the chasers. But the design is open to the objection that the ring prevents threading as far down in a hole as may sometimes be

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