United States Rifles And Machine Guns a Detailed Account of the Methods Used I

Colvin Fred Herbert

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728. Tool- Holding Devices — Taper shank. Cutting Tools — Two counter- bores with pilot, Fig. 729. Number of Cuts— Two. Cut Data- Roughing speed, 260 r. P. M. ; ha -d feed; finishing cut at 85 r. P. M. Coolant — Cutting oil, i^-in. Stream. Average Life of Tool Between Grlndings — 1, 000 pieces. Gages — Fig. 730; A, total length from bottom of counterbore to back end; B, diameter of counterbore and oncentrieity with hole, also acts as a straight-edge across end. Production — 80 per hr. Note — Lo...wer end of bolt is centered by fixed plug.
This is why the thread in this case is so much deeper than the thread by which the receiver and barrel are fast- ened together. It is also a fairly long thread, so as to dis- tribute the wear as much as possible. The amount of work done, however, is so slight that the wear is almost negligible, the only pressure on the thread being due to compressing the main spring.
In a similar way the extractor collar which encircles the bolt, in the special shallow groove provided for it.

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