Hacker, Robert W. (ed.) / The Wisconsin engineer
Volume 53, Number 4 (January 1949)
W. M. H.; R. R. J.
The way we see it, pp. 17-32 ff.
qiame, - Cal eau . a complete line of ele roughing-in materials, National Electric is os~re :su´ Lea Ad avvvs Ac ctrica I your best bet. (continuted Jlon; page 9) In the present machine the set of back gears used per- rnits cutting of gears and sprockets from 7 to 50 teeth in intervals of one, and from 50 to 100 teeth in intervals of two. Other combinations are possible if the demand is sufficient. Gears and sprockets from 6 to 64 inches in diameter can be cut on the machine without attachments and an auxiliary spindle is on the boards which will permit the cutting of gears or sprockets up to 20 feet in diameter. The face width of the gears or sprockets is limited to about 3 inches with those of greater width being laminated from several thinner plates after cutting. It can be seen that the process is far simpler than the one outlined for a cast gear or sprocket, and that the equipment and maintenance costs would be lower just judging from the simplicity of the machine and process. As an illustration of this, note that with 6 or 8 cams the machine is capable of producing over 5000 different types of sprocket tooth forms. No firm manufacturing sprock- ets by the casting method would probably want to carry that many patterns in his pattern warehouse. Again, con- sider a widely used standard chain, such as No. 62, de- tachable. This machine can make any of 90 different sprockets for use with this chain. Now that we have taken a look at the machine itself, let's look briefly at the product and its uses. nIUc FOR Ig URK51u"L - OUSE _ ' Sn V r IV an- !r The ONLY Pencil the Combines these 8 Test of Pencil Superiority 1. America's ONLY 5. Uniform lead !ampor- ruw- L --Au- - imporTed druw- I IU. Ull..- ing pencil. 6. Perfect repro- 2. Extra-dense, ductions from opaque lead. pencil drawings. 3. Smudge-resistant 7. Degrees marked graphite. on all sides. 4. Completely 8. Fine cedar, grit-free. sharpens easily Ask for it at your college book store or local dealer's, or order direct. Only l50' each; $1.50 per doz. Also try Mars-Lumograph No. 1018 Artist Pencil $1.00 each and No. 1904 Artist Leads 6 for 60t. * 5- * * 0 A I (Photo courtesy Cogmnatic Co.) The machinery for flame-cutting gears. When one ordinarily thinks of flame cutting, he thinks of a rather ragged edge with prominant drag lines marring the cut surface. This is a characteristic of hand cutting, but when the job is done on the machine the surfaces are perfectly smooth and are held to amazingly close toler- ances. The designer claims tolerance of .003" on the di- ameter of a flame cut gear or sprocket. This is done with- out any subsequent machining operations after the prod- (please turn to page 32) THE WISCONSIN ENGINEER . . 18 1,> /,
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