Spline Broaching Services

Broaching Technologies offers precision spline broaching services. We have internal spline broach expertise and capabilities to meet precision requirements.

Involute Spline

Involute spline broach shapes are used in connecting driven components in machinery. Applications include gear shifters and clamps for engine shafts. Standard splines and involute splines control power transmission by the way contact is designed into the teeth. Broaching Technologies make them to custom specs or  international standards. The size is limited by the amount of material to be removed. approximately .025 inch per side. This limitation keeps most involute spline forms under 1 inch diameter. Oversize pilot holes are required for all involute spline form rotary broaching applications. The pilot hole will leave a small radius at the inside corners. This radius is often acceptable because contact is still made at the outside of the form. The oversize pilot hole is critical to creating separated chips while broaching and reducing the pressure required to cut the form.

Single vs. Multiple Spline Keyway Broaching

In the event that multiple keyways are required inside a hole,  a multiple spline cut is usually necessary. It is feasible to use a single keyway broach to cut each of the splines one at a time by indexing the workpiece around a fixture, but this is impractical for high volume production.

High volume production work traditionally requires a multiple spline broach that is physically a series of keyway broaches combined into a single spline broach  tool. The cutting teeth on this tool are typically spaced around the tool diameter. The cutting teeth can be straight-sided, involute, helical, spline or organized in a combination.

Blind Hole Spline Applications

Blind hole broaching tooling and design is particularly difficult and requires the expertise of the seasoned broacher. Unlike other broaching styles that cut from one side to the other, blind hole broaching has a more difficult set-up. The tool does not pass completely through the workpiece, and it must be withdrawn backward over the broached surface.

The blind hole spline job usually consists of multiple short push broaches. Each short push broach has a slightly larger diameter than the previous one. These short push broaches are attached to a circular indexing table that rotates around the workpiece. The broaching machine pushes the workpiece over the broaching tool and then removes it. Then, the machine waits for the next broaching tool to index into position.

The main benefit of blind hole broaching is the efficiency of internal Spline production. It is a repeatable process in size without any variance due to cutter deflection. Repeatability translates to economical benefits and quality control.

Contact Broaching Technologies today for all of your Blind Hole Splines and Spline Broaching Tools!