Static Tool Holder holds rotary broach tools.

Press Release Summary:

Designed to hold rotary broach tools in stationary position, ST Series can be mounted into punch press or milling machine for accurate, light-duty pecking or punching operations. Single or multiple static broach holders can be used with different broaches that increase in size until desired form is achieved. In addition to shaping operations, holder can be used to create forms in tough materials, including hexalobular forms where rotary broaching tools may fail.

Original Press Release:

New! Static Tool Holder for Rotary Broaches

The Static Rotary Broach Holder is designed to hold rotary broach tools in a stationary position. The ‘ST’ series broach holders are suitable for standard and custom length broaches. To use the holder, simply mount the holder in the machine, and tighten the set screw onto the desired rotary broach.

Most rotary broaches are used in a rotating holder, which ‘wobbles’ the cutting tool from corner to corner, and greatly reduces the required thrust required to machine the form. However, there are various circumstances where using the static holder will be preferred. The static broach holder is not meant to rotate, but instead to be used in a pecking, or punching fashion.

Static Rotary Broach Holder Uses:
1. The static rotary broach holder can be mounted into a punch press or milling machine for accurate, light duty pecking or punching operations.
2. Multiple static holders can be used in place of a conventional broach. Conventional broaches have multiple teeth that increase in size. Single or multiple static broach holders can be used with different broaches that increase in size until the desired form is achieved.
3. The static holder can be used for shaping type operations. Shaping machines remove a small amount of material in a given direction in multiple swift passes. A static broach holder can also be used as a shaping tool. For example, a square rotary broach could be used to cut a small section of a keyway or rectangle in multiple passes until the full form is achieved.
4. Alignment. Rotary broach tools do not often include alignment features. The static broach holder is fixed and will hold alignment for each pass.
5. The static broach holder can be used to create forms in tough materials. Many hexalobular, or ‘torx-type’ forms can be pecked into tough materials where rotary broaching tools may fail. Many titanium bone screws are manufactured using the following procedure:
a. Drill the pilot hole.
b. Peck the broach into the pilot hole using the static holder  .010-.025” deep.
c. Remove the broach from the part, drill the chips out.
d. Repeat as needed.

If this pecking method is still unsuccessful, partial forms can be made, and then indexed to machine the final form. For example, a broach with two of six hexalobular lobes can be pecked into the pilot hole, removed, rotated, and repeated until the full form is achieved. For more information, please see ‘Improved Process for Medical Implant Broaching’  Pecking and punching operations require significant amounts of force and may be unsuccessful. Be sure to consult with your machine manufacturer for punching capacity. Polygon Solutions does not calculate or estimate forces required for pecking or punching operations.