Custom Machining of Steel Adjustment Screws with a Cast Iron Nut used in a Steel Mill

An industrial customer contracted Denver Machine Shop to manufacture a set of very large replacement “adjusting screws” to 1952 blue print specifications. This part, as shown, is used for adjusting a huge machine which manufactures steel tubes. Using 4140 alloy steel for the shaft and cast iron for the nut, the unit was turned and milled on our state of the art Vertical CNC Mill and CNC Lathe machines. A Tight tolerance of ±0.0005″ was held throughout. The shaft was threaded with a #1 pitch buttress thread. After quench and tempering the screws for hardness, and polishing the threads 32 RMS finish, the unit was installed at the client’s manufacturing plant, on site in Colorado. Turnaround time for this project was rushed to 3 weeks.

The finished shaft dimensions were 5 ft. long x 8 in. in diameter. Each part weighed about 350 lbs. Q & A inspection included hardness testing, thread to thread clearance and functionality, and dimensional inspection. Denver Machine is a reliable source for high quality replacement parts, rebuilds, and custom manufacturing. For more about this adjusting screw project or our other value added services please see the table below or contact us directly.

Highlights of this Custom Machining Project:

Product Description Used for adjusting a plug mill in a steel mill application
Capabilities Applied/Processes
Primary: 
Reverse Engineering 
CNC Turning 
CNC Milling 
Secondary: 
Heat Treating
Sand Blasted 
Cleaned 
Installation
Equipment Used to Manufacture Part CNC Lathe 23” x 10′ between Centers, Vertical CNC Mill
Overall Part Dimensions
Product Weight: 300lbs. 
Product Length: 5′ – Shaft
Product Diameter: 8″ – Shaft
Tightest Tolerances ± 0.0005″
Material Used 4140 Steel – Shaft 
Cast Iron – Nut
Material Finish 32 RMS
Additional Facts Installation at customer’s site
Shaft has a #1 pitch buttress thread
In process testing/inspection performed Dimensional Inspection, Hardness Testing, Functionality Testing
Industry for Use Steel Mill
Volume Set of 2
Delivery/Turnaround Time 3 Weeks
Delivery Location Colorado
Standards Met Customer Specifications, 2D CAD Drawing
Product Name Adjusting Screws

 

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