This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ...finish. The cutting edge is not at right angles to the axis of the work but should be about 20 from this perpendicular as shown in the figure. This causes the chip to curl away from the finished cut and also reduces the tendency for the tool to spring into the work. The boring tool must have side clearance (b, Fig. 137 ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ...finish. The cutting edge is not at right angles to the axis of the work but should be about 20 from this perpendicular as shown in the figure. This causes the chip to curl away from the finished cut and also reduces the tendency for the tool to spring into the work. The boring tool must have side clearance (b, Fig. 137) to permit of its biting into the work and thus peel off the chip; and also front clearance (c, Fig. 137) so as not to rub on the finished work. The clearance must be sufficient to preclude any chance of rubbing but should not be excessive or the cutting edge, not being "backed up," will break away and dull quickly. Have the boring tool bar as short as the length of the hole will permit and be very sure that the bar will clear as the tool works into the hole. 121. The Boring Tool Holder.--A boring tool holder in which the length of the bar, and the position of the cutting edge of the tool may be adjusted, will usually give better satisfaction Fro. 138.--Armstrong boring tool holder and wrench for adjusting or tightening either the cap or the bar. than the forged tool. Figure 138 represents a boring tool holder having these advantages. The tool bit may be sharpened and re-set without disturbing the tool holder, which advantage is especially desirable when cutting an inside thread. The extra cap which holds the tool point at an angle is useful when boring to a shoulder or when squaring the bottom of a hole. Fig. 139. Figure 139 shows a "home made" boring tool holder which is very handy. The hole is filed V shape lengthwise opposite the screws to give a perfect seat for various sizes of tools. The tools may be made from pieces of drill rod. 122. Reasons for Boring.--It is often necessary, after drilling, to enlarge a hole wit...
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