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CNC Milling of a Stainless Steel Bell Crank for the Aircraft Engine Industry

The project highlighted here is an example of KL Steven has the ability to provide custom CNC milling services for a wide array of aerospace application. We manufactured a quantity of 320 of this bell crank which was used as an aircraft engine trim component. This part was machined from cast 17 - 4 PH stainless steel, and featured a hardness of Rc 28-35. The CNC milling used to machine this part required the fabrication of custom fixturing which we provided in-house. These parts also received surface grinding, honing, and deburring to reach to dimensions called out in the customer supplied drawings. The finished dimensions of 4" x 4" x 5/8", met tolerances of ±.001", these dimensions were verified throughout manufacturing by dimensional, visual, and FPI inspection. To learn more about this project, see the table below or contact us directly.

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CNC Milling of a Stainless Steel Bell Crank – Project Details

Product Description
Commercial Aircraft Engine - trim component (control)
Precision CNC Turning Capabilities Applied/Processes
CNC Milling
Surface Grinding

Part Marking – Electromechanical Etching
Equipment Used to Manufacture Part
CNC Vertical Mill
Sunnen Hone
Overall Part Dimensions
4" x 4" x 5/8"
Tightest Tolerances
Material Used
17 - 4 PH Stainless Steel, Cast
Material Finish
Hardness: Rc 28 - 35
In Process Testing / Inspection Performed
Inspect Castings, Dimensional Inspection, Visual Inspection, FPI Inspection
Industry for Use
Aerospace Industry
Delivery/Turnaround Time
20 weeks
Delivery Location
Standards Met
Customer Specifications, 2D CAD Drawing
P3TF2 CL - A
Product Name
Bell Crank
Why did you choose this project to show case?
In-house fixturing created to finish machine operations on castings.
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