How to find the right Broaches AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Broaches
- Broach width matches key size
- Choose the keyway broach width for the standard key used on that shaft diameter. The keyway must accept the standard key for the shaft.
- Bushing matches bore
- The guide bushing must match both the bore diameter and the broach width. A loose bushing lets the broach wander and cut an off-center or tapered slot.
- Shims for depth
- Full keyway depth usually needs a second pass with the shim behind the broach. Skipping the shim leaves the keyway too shallow for the key.
- Press capacity versus length of cut
- Longer hubs and wider broaches need more arbor or hydraulic press force. Undersized presses stall mid-stroke, and the broach can snap.
- Push or rotary
- Push keyway broaches are used in a press; rotary broaches are used for hex or Torx forms in a lathe or mill holder. They are different systems and are not interchangeable.
Brands that matter
- duMONT: Long-established keyway broach, bushing and shim maker.
- Slater Tools: Rotary broach holders and forms.
What to avoid
- Broaching dry: use cutting oil on every stroke.
- Mixing broaches and bushings from different systems.
- Cheap sets with soft bushings that wear oversize.
Questions
Why is my keyway too shallow?
Most keyway broach systems are designed to need a shim pass after the first cut to reach full depth.