Page 42 - Slater Tools Rotary Broaching Catalog

I do not see the size broach I am looking for listed. Can you make the broach I need?
Yes. We can produce any size hex or square in only 1-2 days. All other custom
broaches have a 5-10 day lead time.
What materials can I broach?
A wide variety of materials commonly cut during machining can also be broached
using Rotary Broach Tooling from Slater Tools. Common materials include soft metals such
as aluminum, brass, alloy metals, stainless steel, plastics and carbon fiber. Tensil strength of
the material plays a large role in how the material will respond to broaching. The higher the
tensil strength, the more difficult it may be to rotary broach. Although we may not recommend
broaching certain materials, this does not mean they cannot be broached. Sometimes by
opening up your pre-drill diameter or broaching a shallow depth, rotary broaching can be
successfully accomplished but tool life may be reduced.
What type of fluid should I use during the broaching process?
Fluids play a minor role in rotary broaching. Any conventional water or oil based fluid
is acceptable. Many customers choose to turn off the coolant during the rotary broaching
When mounted in a mill, why does my holder look like it is wobbling?
The holder is built on a 1 degree angle. This design reduces broaching pressure and
causes the holder to look like it is wobbling. Do not alter the holder’s 1 degree angle.
How do I remove the chips from my part?
Add an undercut or recess before broaching to allow the chips to break cleanly. You
can also rebore or flat bottom drill after internal broaching.
What will happen if I do not pre-drill or pre-turn the diameter to the recommended size?
While it is possible to remove full-form, you will likely see a significant reduction in
tool life of the broach. There is also potential for premature bearing wear of the tool holder or
excessive pressures that may alarm your machine.
What is the largest form I can rotary broach?
We are able to produce internal broaches up to 2.30” and external forms up to 1.80”
in diameter. The ability to successfully broach these forms is application specific and will
depend on the type of material you are broaching and the depth of broached area. If you have
questions about an application, it is always best to call or send us a print.
What information do I need to provide for checking feasibility of rotary broaching?
We will need to know the shape, major diameter, minor diameter, material and
broaching depth. We recommend sending us a portion of your print of the area to be
How deep am I able to broach?
As a general rule, you should not attempt to broach more than 1.5 times the minor
diameter of the form. Depending on the type of application and the material you are
broaching, this could be reduced or increased. It is always best to send us a portion of your
print to ensure you will be able to successfully rotary broach.