The feed is the rate at which the bit passes through the material. The speed is the RPMs of the bit. The faster the feed, the higher the speed.

Polygon Solutions is pleased to provide a wide variety of standard inch and metric square broach sizes suitable for rotary broaching. Most broaches are available for immediate delivery from our Fort Myers, FL facility. Polygon also offers fast delivery on custom and special order square broaches.

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An oversize pilot hole is also an important key for rotary broaching. For squares, we recommend a minimum 10% oversize pilot hole, which will leave a small radius in the middle of the flat. This small amount of material removal is needed to create separate chips and reduce pressure. Pilot hole diameters closer to the flat-to-flat dimension of the broach can be used, but may affect tool life.

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Using the square broach is not difficult, but a few key points should be kept in mind. Rotary broaching does require the use of a chamfer. The chamfer helps the broach to stay on center, and is also the point where the chip begins to curl up at the face of the broach.

Perhaps you’ve heard the riddle “It’s like trying to fit a square peg into a round hole”. This is interesting because a square shape can easily be made on the outside of a part, and a hole can be drilled on the inside of a part, however the two are not compatible. With rotary broaching however, squares holes are commonly made for custom sockets, shaft extensions and hardware components.

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Of the many ways to accomplish such a task, rotary broaching is no doubt the most popular, most efficient and most cost effective. Best of all, square rotary broaching tools work on almost all turning machines.

Finally, there must be room for the chips to accumulate in the bottom of the hole. If the pilot hole is a through hole, then generally this is not a concern. However, if it is a blind hole, consideration must be given to provide clearance for chip accumulation inside the hole. Drilling the pilot hole 50% deeper than the broaching depth is a rule of thumb for determining final pilot hole depth.

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