A customer in the food processing equipment business presented us with very interesting application for our tool. Our task at NMT was to design and develop a tool to mill 6 slots 60 degrees apart. Our solution was to create a unique Keyseat Miller designed with a sliding side location guide 60 degrees from the center line of the keyseat cutter. The first slot is milled conventionally. The part is then rotated 60 degrees, the location guide is secured (a simple set of 3 screws) to the body of the tool and then the side guide “becomes” the index to mill the remaining 5 cuts – each cut exactly 60 degrees from the one prior. The finished keyway dimensions were .500” in width and a depth of .187” with a .1505” radius arc. Extensive visual and dimensional inspections were conducted to ensure quality and functionality of the part. This project highlights our ability to design a tool to mill and index radiused slots.

For more information on this project, or the processes involved to manufacture it, see the table below or contact us directly.

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Keyway Milling of a Stainless Steel Auger Project Highlights

Product Name

Auger Keyseat Miller

Problem Description

Part required 6 slots 60 degrees apart beginning 5 inches down in the part


Special Keyseat Miller designed with side location guide 60 degrees from the centerline of cutter-mill first slot conventionally-attach location guide-rotate tool 60 degrees-location guide slides into first slot milled-process is repeated until all six slots are complete

Capabilities Applied/Processes


  • Product Development/Design

CNC Milling
CNC Turning

Keyway Dimensions

Width: 0.500″
Depth: 0.187″ with Radius Arc

Tightest Tolerances

Within 0.0002″

Material Cut

440 Stainless Steel

In process testing/inspection performed

Dimensional Inspection, Visual Inspection, Functionality

Industry for Use

Food Processing Equipment Manufacturing



Delivery/Turnaround Time

Stock Items: 2 – 3 Days
Custom Items: 2 – 3 Weeks

Delivery Location

Nationwide / Worldwide

Standards Met

Customer Specifications, 2D CAD Drawing