Most rotary broach holders have a free turning spindle that does not allow for hole alignment. The rotary broaching brake from Polygon Solutions is a mechanical solution for aligning broached forms in machined products.
The company designed the broaching brake to be used as an attachment to its GT series rotary broach holder. The brake mounts to the toolholder using set screws. Additional screws are included at the opening of the brake to gently tighten against the spindle. The broach is fastened into the spindle and must make contact and be aligned at the first hole.
When the broach is engaged with the part, the brake is loose enough to allow the spindle to turn without interfering with the broaching operation. Unlike typical rotary broaching operations, turning must stop before removing the broach. When the broach is removed, the brake screws are tight enough to hold the broach’s position until it makes contact with the part at the next hole.
The rotary broaching brake can be used to hold orientation for single or multiple parts. It is a lightweight, low profile tool and can be easily fit into the VMC’s toolchanger, the company says. It slides onto the head of the holder and does not require special tools for adjustment or assembly. The brake can also be removed for operations where it is not required.