Rotary Broach Toolholder

This rotary broach allows machinists to add internal hexagon, square and other forms to precision metal parts.

Related Suppliers

This rotary broach allows machinists to add internal hexagon, square and other forms to precision metal parts. The modern machine shop can benefit from the quick setup and ease of use available in adjustment-free broach holders. The GT Series broach holder available from Polygon Solutions has been designed for this purpose and often eliminates secondary operations.

 
The single-pass broach is held on center in the holder at a 1-degree angle. Thus, the full force of the machine is directed to the cutting edge closest to the part. Since this is a turning operation, the cutting action will rotate to every edge, and as the tool is fed into the pilot hole, the desired depth is achieved.
 
The rotary broach holder requires no centering, indicating or alignment procedures. The broaches are cut to a specified length. When fastened into the holder, the broaches are designed to be on center with the pilot hole. A small amount of endplay ensures that the broach will follow the chamfer of the hole.
 
When broaching a blind hole, it is possible that hydraulic pressure can build up because of air and fluid that may get trapped inside. Rotary broaches and GT series broach holders include a pressure relief hole to eliminate hydraulic pressure. Air and fluid are pushed through the hole in the broach, and then can escape through the hole in the broach holder.
 
The rotary broach holder is available with two different spindles. One spindle accommodates 8-mm shank broaches, and the other holds 0.500” shank broaches. Although the 8-mm broaches may cost a little less, the 0.500” shank broaches are available in more sizes. Rotary broaching is ideal for forms within this size range.
 
The bearing configuration of the broach holder is designed to handle the loads associated with rotary broaching. The sealed design requires no maintenance or messy grease guns.