• Treat a broach as carefully
as you would any other precision cutting tool in your shop.
Use plastic mesh tubing to protect critical cutting edges
or store in suitable containers when not in use.
• Don't expect a broach to correct excessive eccentricity due
to inaccurate previous machining. It is best practice to
use the broached hole as the "locating point" for
subsequent O.D. turning or facing operations where close
concentricity must be obtained.
• Always check the suitability of a broach for the specific
job it is to do. The material, length of broached hole, broaching
speed, broaching fixture and type of broaching machine all
affect satisfactory broach performance. Please allow our
trained broach engineers to assist you in this regard.
• Never permit the cutting teeth of a broach to come into contact
with a hard metal edge or surface since the cutting teeth
of broaches are generally extremely hard and may be damaged
(this includes broaching backup plates over 38/40 Rc).
• Grind only enough metal from each tooth of a broach to bring
it to required sharpness. Grinding away more than the necessary
amount on each tooth shortens the life of a broach, only
a few special broaches require that the same amount of metal
be removed from all teeth.
• Use adequate equipment, designed especially for broaches
when sharpening them. Broach life is materially shortened
if correct tooth form is not maintained and the broach is
not held properly in the sharpening machine.
• Use the right type of grinding wheel when sharpening broaches.
The wheel size, grain and grade are important in obtaining
sharp cutting edges without burning the metal, and in least
time.
• Before deciding on any broaching set-up, make sure that the
broaching machine is of adequate capacity for the specific
job to be performed. Broaching speed and smoothness of operation
not only affect the broaching time, but also the quality
of the work done.
• In making any broaching set-up, check the alignment of the
puller and guide bars(if used) with the centerline of the
face-plate or platen before mounting the fixture.
• In hole, spline and keyway broaching operations, check the
alignment of the fixture with the centerline of the broach,
puller and guides before starting the broaching operation.
• In helical spline broaching, keep backlash and wear of the
broach drive head and lead bar at a minimum. It is difficult
to maintain close limits on helix angles, if excessive wear
exists.
• Design the broaching fixture or face plate adapter used in
round or spline broaching for as small a clearance as possible
without making it too difficult to insert and remove the
piece to be broached.
• In all surface broaching operations, make sure that the fixture
is sufficiently rigid to prevent movement of the piece.
At Pioneer Broach we have learned that adhering to the above
you can avoid or limit some of the most common problems associated
with broaching.
We have experienced engineers ready to help you solve
your most pressing broaching needs. So please call or E-mail
us now.
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