Dimensioning spotfaces

Countersinking is also carried out on a drilling machine, and Fig. 14.30 shows typical tools. Included angles of

Spotfacing is a similar operation to counterboring, but in this case the metal removed by the tool is much

Fig. 14.30(b) Straight-shank machine countersink (with 60° or 90°

included angle of countersink) Fig. 14.33

Fig. 14.30(b) Straight-shank machine countersink (with 60° or 90°

included angle of countersink) Fig. 14.33

Dimensioning Counter Sink

/ /

$ 16

Fig. 14.31

less. The process is regularly used on the surface of castings, to provide a flat seating for fixing bolts. A spotfacing tool is shown in Fig. 14.32, where a loose cutter is used. The length of cutter controls the diameter of the spotface. As in the counterboring operation, the hole must be previously drilled, and the pilot at the tip of the spotfacing tool assists in location.

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