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here's our mechanical components used to transmit power and motion through the
success of engagement of their peripheral p
years perform certain key function within the scenes anderson
such as reversing the direction of rotation
for altering the angular orientation of rotary motion
gears are also used to convert rotary motion
into linear motion
and vice versa
or to alternet here speed ratios
the methods of machining gears can be classified into two primary categories
gear generating
and gear form cutting
many of the process is used to machine gears may also be used to finish gears
gear generating involves gear cutting through the relative motion between a
rotating cutting tools
and the generating motion for rotation of the workpiece
the primary here generating processes include
hobbling
and shaping
in harding
gear teeth are progressively generated by a series of cuts
using a he likley fluted cutting tool called
a hobby
both the hob and the gear blank rotate
as the hob is fed axially across the face of the blind
carving is the principal method for producing spurred here's
and he'll ical gears
and is also used to produce many special gear forms
the main limitation of hobbling
is that it can only be used to produce external gears
hobbling can be performed on a single gear blind
but also allows for the stacking of work pieces to increase production rates
shaping generates gear t by rotating the workpiece in contact with the
reciprocating qatar
the reciprocating cutter maybe opinion shaped cutter
a multi to rack shaped cutter
or a single point cutter
the pinion shaped cutters axis is parallel to the gear black
and begins cutting by reciprocating while feeding gradually came to the
blank to a predetermined cutting debt
the qatar and here blank rotates slowly at the same pitch circle velocity
as the cutter enters and exits the cut
incrementally generating the gear t
rack shaped cutters typically have between six to twelve t
that reciprocate into the gear black
once the rack other finishes the past the cutter is disengaged
and returns to a starting point
to begin cutting again
when shaping with a single point qatar the cutter reciprocate making
successively deeper cuts
until a predetermined depth is reached
kirsch shapers are used to make internal gears shoulder gears and many other gear
types that cannot be produced with harbors
shapers can also produce none invalid shapes such as a camp and here on the
same sheth
here form cutting typically involves the use of formed tooth cutters
that had the desired gear shape or profile
the primary key reform cutting processes include
bro chain
and milling
bro ching is the fastest method of machining gears and is performed on many
different machine types using a multi to cutting tool called brooch
the broach or the gear blank are pushed or pulled relative to each other to
remove material
each to film the broaches generally higher than the preceding too
as a result
the depth of cut
increases with each two
as the broken operation progresses
the conventional method approaching issues mainly to produce internal gears
for external kearse
papa roach ng issues
part perot ching is performed on special machine tools
having a hollow broach ing to assembly called
the park
gear blanks are either pushed down
pushed op
or holed up through the park
could generate the gear t
milling
is a machining process that uses the relative motion between a rotating multi
edge cutter
and the workpiece to generate here shapes
milled years i've typically produced using cutters
that milk each here to space individually
to produce large course pitch internal or external spur
devil or he would go beers
a process called dashing can be used on heavy duty milling machines
dashing involves plunging the rotating cutter into a blank
for rapid metal removal
after machining
gears may require heat treatment to meet hardness requirements
after he treating gears usually require finishing
nullify any distortion that may occur
in some cases here's our machine
finished before he treatment
and then once processed surface finish
to remove distortion from the heat treatment