| 单词 | twist drill |
| 例句 | The speed of the drill must be as slow again as for the ordinary flat drill, and not more than one-third as fast as the twist drill. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The simplest form of twist drill used is shown at Fig. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Oh, no, I believe it's mowing machines,—or maybe twist drills—anyhow one of those missionaries from our own little home-paradise of cogs and gears. Rough-Hewn 2011-09-20T02:00:15.147Z These reamers are held while in use in a socket inserted in the tailstock spindle, as when using a twist drill. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. Instead of using an ordinary twist drill, a special hollow drill may be obtained from the Universal Battery Co. The Automobile Storage Battery Its Care And Repair Professor John E. Sweet advocates grinding twist drills as in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z Drills are of two general classes, the flat and the twist drills. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z It is not necessary, however, to use a file at all, for the twist drills made by the Morse Drill Company are quite hard enough in their natural state to bore glass. On Laboratory Arts One method of drilling in the lathe is to insert an ordinary twist drill in a holder or socket S, Fig. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. Drills.—Holders for grinding twist drills are now furnished at very low prices, and instructions are usually sent with the machines, but a few words may not be amiss for the benefit of thosep. Practical Mechanics for Boys It is found that 120 to 130 such holes can be drilled before it is advisable to resharpen the twist drill. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z A twist drill removes metal by cutting and it is not necessary to use a heavy feed as the drill will tend to feed itself into the work. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Light fragile cutters, twist drills, taps and formed cutters may be heated almost white and then dipped in fish oil for hardening. The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel Testing Work with Dial Indicator A hole is next drilled in the end of the rod by using a twist drill in the tailstock. Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. How are twist drills made, and are they single or double grooved? Scientific American, Volume XXXVI., No. 8, February 24, 1877 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. In the smaller sizes of twist drill, the stem or shank is made parallel, as in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The holes are best made with a tiny Morse twist drill. Things To Make The only advantages possessed by the flat drill are that it will stand rougher usage than the twist drill, and may be fed faster, while it can be more easily made. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The taper shanks of twist drills are given a standard degree of taper of 5⁄8 inch per foot of length, which is termed the Morse taper. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z A twist drill possesses three cutting edges marked a, b, c respectively in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z Parallel shanked twist drills are driven by chucks, while taper, shanked ones, are driven by sockets, such as in Fig. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z One must avoid distorting the orifice, which should be perfectly circular; clean it out with a small twist drill of the proper size. Things To Make The rates of feed for twist drills are thus given by the same Company:— Diameterof drill. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z A similar twist drill, 29⁄32nds inch in diameter, drilled a hard steel rail 13⁄16ths inch deep in 1 minute, and another in 1 minute 10 seconds. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z For these reasons the fluted drill or the twist drill is preferable, especially as their diameters are maintained without forging. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z The commercial sizes of both taper and straight shank twist drills are as follows:— Diameter. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z For fluted or twist drills the lathe may run quicker than for a flat drill, which is again an advantage. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z |
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