Synopses & Reviews
Yes, you can now drill a hole, straight and true, all the way to China. Well, almost.
You get a complete reprint of Machinery Reference Series Booklet No. 25 from 1910 and two later articles from Machinery Magazine.
Part one covers the basic problems of deep hole drilling using twist drills, flat drills, getting chips out, errors in drill sharpening, number of desirable edges and so on.
Next, you learn how the big boys could accurately drill out a cannon barrel and then bore it using a forged gun-steel boring bar over 61' long and 11" in diameter. Other examples are discussed.
The final topic covers the construction of deep hole drills needed to drill out spindles of machine tools and axles of steam locomotives. Obviously, we don't need to drill castings or forgings this large, but the principles hold. And these primitive methods really did produce remarkably precise machines and armament.
Finally, two articles from Machinery Magazine of the 1920's discusses how an mistake created a remarkable result while boring shotgun barrels, and how one machinist made a drill bit to cut a 9/32" hole more than 15" deep.
Old stuff. Interesting stuff. This is the way the oldtimers did it, simply and accurately. Get a copy.