. Teacher's handbook of Slöjd . Fig. 71. American Brace ; section of screw adjustable socket, or bit holder, i. 110 HANDBOOK OF SLOJD. The bits in most general use are quill-hits and quill-bits are called The ordi-nary centre-bit. J A BCD Fig. 72. A, Auger-bit. B, Centre-bit. C, Quill-bit. Z), Hole-rimer , Screwdriver bit. F and G, Counter-sink drills. ^. 1. The quill-bit (Fig. 72, G) is gouge-shaped, with the endcurved like the point of a spoon. Unlike the centre-bit, ithas no middle point, and it is therefore more difficult to gaugeto holes of any given si
. Teacher's handbook of Slöjd . Fig. 71. American Brace ; section of screw adjustable socket, or bit holder, i. 110 HANDBOOK OF SLOJD. The bits in most general use are quill-hits and quill-bits are called The ordi-nary centre-bit. J A BCD Fig. 72. A, Auger-bit. B, Centre-bit. C, Quill-bit. Z), Hole-rimer , Screwdriver bit. F and G, Counter-sink drills. ^. 1. The quill-bit (Fig. 72, G) is gouge-shaped, with the endcurved like the point of a spoon. Unlike the centre-bit, ithas no middle point, and it is therefore more difficult to gaugeto holes of any given size, especially if the latter are large. This bit is belter than the centre-bit for boring end are made in various sizes, from those adapted forholes of i\ inch in diameter to those suitable for holes ofIJ inch in diameter. The smallest kind, the pin-bit, is mostused in wood slojd. A set of pin-bits includes from 8 to 10,varying in size from -g inch to J inch. 2. The Centre-bit. 1. The ordinary centre-bit (Fig. 72, B, and 73, B) has a flatblade, the lower portion of which is broader than the upper,as is shown in the illustrations. In the middle of the low^eredge is the centre-point a, and at one side is the c
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