A shorter course in woodworking; a practical manual for home and school . oreconveniently, stuck in holes in racks exposedto view. The Countersink, used with the bit-brace,is to enlarge the outer part of a hole to receivethe head of a screw (Fig. 185). The rose form of countersink is good and suit- ^^ ^^^ able for all hard woods. The Clark double-cut . countersink (for wood only) cuts smoothly ~- and is easily sharpened. A countersink for metal is useful. 48. Use of the Brace and Bit.— Fasten the bit firmly in the jaws of thebrace. It is often well before boringin hard wood to prick a hole wit
A shorter course in woodworking; a practical manual for home and school . oreconveniently, stuck in holes in racks exposedto view. The Countersink, used with the bit-brace,is to enlarge the outer part of a hole to receivethe head of a screw (Fig. 185). The rose form of countersink is good and suit- ^^ ^^^ able for all hard woods. The Clark double-cut . countersink (for wood only) cuts smoothly ~- and is easily sharpened. A countersink for metal is useful. 48. Use of the Brace and Bit.— Fasten the bit firmly in the jaws of thebrace. It is often well before boringin hard wood to prick a hole with anawl to start the worm of the bit in theexact place, as sometimes it works offto one side. The worm can be placedon the point as in Fig. 154, and thebrace and bit changed to the properposition before boring. After the bithas gone a short distance into the wood,stop boring, stand squarely in front,and judge by eye whether the bit isat right angles with the work. Thenstand at either side at right anglesto the first position and judge again. Alter the position of the. 155 56 A Shorter Course in Woodworking brace if necessary and repeat the test after boring a littlefarther. The square can be used, but it is better to learn to bore without re-lying on such help. To keep the bit perpendicular some workmen lookdirectly down upon it from above, instead of from the side, turning thebrace while they move slowly around from one side of the work to the rest the chin on the left hand on top of the handle of the brace, tosteady it (Fig. 155); and to increase the pressure when necessary, as indriving heavy screws with the screw-driver-bit, the shoulder is sometimesapplied. No pressure is needed to bore with an auger-bit. If much forceis needed it is a sign that the bit is dull, or that something is wrong. To remove a bit from the wood, give the brace a turn or twobackward, which will loosen the worm, and then either pull the bitstraight out when it can be done easily without
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyorklondongpput
