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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.


Page 18


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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