Broaching Technologies offers a full array of contract broaching services. We specialize in blind keyways, but our machining services also include contract production broaching for slab, slot, surface, internal and external applications.
“The Keyway and Spline Cutting Specialists”
Through and Blind Hole:
- Tapered Keyways
Precise broaching of keyways and splines from 1 piece to high volume
Our Sales Line Includes:
- High Speed Slotting Machines
- Tooling Adaptable to your Existing Machines
Blind Hole Broaching or Blind Keyway Broaching
Precision blind keyways result from Broaching Technologies commitment to excellence
Blind hole broaching meeting precision tolerances
A Technique Unique in Two Respects:
- The tool that is used to do the work does not pass completely through the workpiece; and
- The tool is drawn backward over the broached surface at the end of the work stroke.
Special tools are designed to accomplish this task, and it takes a particularly seasoned craftsman to execute the work in such a way that the desired tolerances are kept, while ensuring all surfaces are perfect.
If you’re in need of a keyway in a blind hole (a hole with a bottom), we can cut any type including blind keyways with a groove relief at the end of the keyway.
Contact us for a blind keyway demo.
Blind Hole Broaching Advantages
- Only method of cutting slots, shapes and forms on certain piece parts
- More cost-effective and faster than plunge EDM
- Precise keyway cutting tolerances
- Complex internal forms
The blind broach makes indents and shapes in metal workpieces. Shapes include round, square, hex and more. This can be accomplished in small sizes measuring 1/4″ diameter up to very large sizes. Blind broaches can also be done for a one-of-a-kind prototype or for a thousand+ piece production run.
It’s also possible to combine shapes of different sizes and depths on the same workpiece.
Contact Broaching Technologies today for your custom quote on blind hole broaching!
Precision Spline Broaching Services
Spline Broaching Services
Blind Hole 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 makes them to custom specs or to international standards.
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 in 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 a seasoned broacher like Broaching Technologies has on staff. 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 into economical benefits and quality control.
Contact Broaching Technologies today for all of your contract broaching services!