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The Gear Hobbing Process
The Gear Hobbing Process Dennis ,Gimpert K'oepfer America Limited Partnership" South Elgin.IL ear hobbing . cessive cuts on the workpiece, with the...
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Kenneth Thornton
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The Gear Hobbing Process Dennis ,Gimpert K'oepfer America Limited Partnership" South Elgin.IL
ear hobbing
.
cessive cuts on the workpiece, with the work-
refers to the fact
piece ,in a slightly different po ition for each
is a generating
The term generating
proces
that the gear tooth form cut is lIotlllc
cut (see Fig. Ib). Several cutting edge
conjugate form of the cutting tool,lhe
tool will be cutting at the arne time.
hob. During workpiece relationship. typically
hobbing
rotational.
[)uring this rotation, the hob i
fed axiaUy withall the teeth being
edges.
Each cutting
tooth is also relieved
radially to provide chip clearance behind the cutting edge. This also allowsthe be sharpened
hob face to
and still maintain the original
tooth shape. The final profile of the tooth
j
hob, the workpiece will advance one tooth for
created by a number of flats blending togeth-
each revolution of the cutter. Wilen bobbing a
er. The number of flats corresponds
twenty-tooth
number
gear" the hob will rotate twenty will rotate once.
of cutting
workpiece
gashes
tooth during
which a single
to the pass the
rotation.
The profile is formed by the equally spaced
Thus, the greater the number of gashes in the
cutting edgesaroundthe
hob, thegreater
hob, each taking sue-
18 fig.l a & b TECHNO~OGY
a wonn with gashes.
axially across it to produce these cutting
gradually formed as the tool traverses the work
times, while the workpiece
GEAR
CUi
face (see Fig. Ia). FOIl" a spur gear being cut with a single start
:38
The hob is basically
both the hob and the
rotate ill a continuous
of the
the number of flats along the
1b:
Length Active Length
~.15J"
DP "Fine Pitch is
-
---
Filg. 2 profile which improves
the "smoothness"
of
the tooth profile.
The Cutter Bobbing
is a generating
process,
and the
hob win not cut the same shape as the cutting tool form, An unmodified is produced by
.
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