Twist Drills for Brass

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“For brass or other soft metals there may be used with advantage a twist drill as shown. The cutting edges of the drill are ground straight and in line with the body of the drill for a distance of 0.03 to 0.06 in. = 0.8 to 1.6 mm. This prevents the breaking of the drill when it goes through the work—piece.” —Grimshaw, 1902


Grimshaw, Robert Modern Workshop Hints (Philadelphia, PA: Sampson Low Marston & Company LTD, 1902)


TIFF (full resolution)

2400×816, 192.2 KiB

Large GIF

1024×348, 34.2 KiB

Medium GIF

640×217, 18.4 KiB

Small GIF

320×108, 7.0 KiB