Here’s the super-speedy way to turn case-necks. Our friend Erik Cortina figured out how to turn his match cartridge case-necks using his milling machine. Erik told us: “While in Raton [a while back], Mid Tompkins told me that he turns his brass on milling machine. He said he could do about 500 in two hours, so I decided to try it.”

Erik fitted a Don Nielson “Pumpkin” neck-turner to the mill, and he used a modified 21st Century case holder to secure the brass. As you can see from this video, Erik was very successful with the process. The tool spins at 1500 rpm, turning Lapua 6.5-284 cases that have been necked up to 7mm.

Video Shows Eric Cortina Neck-Turning Cases with Milling Machine:

Cartridge Brass: Lapua 6.5-284 necked up to 7mm
Lubricant: Lithium grease inside and outside of neck
Neck-Turner: Nielson Pumpkin running at 1500 RPM

It’s hard to argue with Erik’s results. Here are his turned Lapua cases, which have neck-wall thickness consistent to two ten-thousandths of an inch. Think you could do better turning manually?

Some of Erik’s Facebook friends had questions about this process:

Q: Who makes the shell-holder?

Erik Cortina: I did! The shell-holder you can get from 21st Century. I Tig-welded a punch as a handle.

Q: I love the idea of working smarter not harder! Any galling issues? What are your mitigation techniques?

Erik Cortina: No issues. I use lithium grease in spray can. Makes a foam that I dip necks into.

Q: Shouldn’t either the case or the cutter be floating to allow most precise neck turning?

Erik Cortina: Up until [I tried this] I believed the same thing. I was going to build a floating case holder but decided to try rigid setup on a few cases before I built it. Results were great. Neck thickness doesn’t vary more than .0002″, which is same as when I was doing it with floating case holder on the lathe.

Q: Any problems with the Pumpkin changing the cut as it heats up?

Erik Cortina: No — there were no issues with that.

NOTE: Erik Cortina is a very skilled machinist who custom-crafted fittings used for this process. This kind of neck-turning with a milling machine may not be for the everyday hand-loader!

Nielson “Pumpkin” Neck-Turner

The circular orange cutting fixture on Erik’s Milling Machine is a Don Nielson “Pumpkin” neck-turning tool. Don designed this tool to be used by hand or with power. The Pumpkin boasts an eccentric mandrel that allows the cut to be adjusted easily in precise .0001″ increments. Benchresters like this as it allows for very precise control of cut depth and neck-wall thickness.

Nielson Neck Turner with carbide mandrel. Photo Courtesy Butch’s Reloading.

For years, Timney triggers have been popular drop-in upgrades for hunting rifles, rimfire rifles, and AR platform rifles. To meet the demand for its many trigger products, Timney Triggers has expanded its operation, adding state-of-the-art CNC machines and other high-end, automated equipment. A far cry from the dank gun factories of the 1950s and 1960s, Timney’s Arizona production center now resembles the squeaky-clean, ultra-modern facilities where electronics are assembled.

Today’s Timney factory is all about computerized automation. Timney Triggers’ owner John Vehr states that it would take 60 or more trained machinists and metal-workers to produce as many triggers as can Timney’s modern machines. Timney does employ two dozen workers, but they are assigned tasks that the computerized machines can’t do as well or better.

If you want to see how Timney triggers are made this days, check out Tom McHale’s recent account of his visit to the Timney Factory in Scottsdale, Arizona. McHale explains how the triggers are designed and fabricated, and 20 high-rez photos illustrate the production process and machinery.

CLICK HERE to read Timney Triggers Factory Tour Article by Tom McHale.

Tom McHale is the author of the Insanely Practical Guides book series that guides new and experienced shooters alike in a fun, approachable, and practical way. His books are available in print and eBook format on Amazon.com.

Jerry provided these photos of the first 2500X action off the production line. Jerry notes that: “The only difference with the final production version is that the body will be melonited on the inside for super-slick operation and the outside will still be polished for great looks”.

Stiller 2500X Rimfire Action Features

• Dual rear locking lugs symmetric about the horizontal centerline.
• Super tight tolerances on all fitted parts.
• Firing pin design easily unscrews.
• 6 o’clock or 12 o’clock firing pin. The other pin acts as a guide to eliminate any off-axis canting that can impair ignition and cause flyers.
• Cocking piece controlled by a shroud so it is always centered in the trigger and cannot rub.
• Easy loading ramp design similar to the Anschutz.
• Entrance cams in the body.
• Beveled loading port
• Four #8 screw holes for scope mounts, plus two #6 screwholes (in between) also reamed for .125 pins. That way a long one-piece mount or just front-only will both be accommodated.
• Threaded bolt handle so that any available knob will work. Stiller offers three knob types.

State-of-the-Art Machining Technologies Used to Make 2500X Actions
A multi-step process is employed to deliver precision tolerances on every 2500X action. The process begins with a drilled, undersize hole. Then the body is cut and heat-treated/stress-relieved with oversize outside diameter (OD). The Inside diameter hole is wire-EDM finished after heat-treating for optimal sizing and straightness. Next the OD is ground to size and the action face and threads are machined. The action is finally engraved, hand-finished, and melonited on the inside (unless the customer specifies a non-melonited version). Individual parts receive special attention — the extractors are wire-EDM cut, and the bolt lugs are factory-lapped with special devices to load the lugs as they would be when fired.

5-Axis Milling Magic
In the videos below, a modern, computer-controlled 5-axis milling machine produces a complete motorcycle helmet shell start to finish. Yes, the motorcycle helmet was milled out of one solid 120kg block of aluminum.

Every feature of the aluminum helmet was cut by machine — even the side vents and rear “50th Anniversary” logo and mesh grill”. The machines in use are 5-Axis hyperMILLs produced by Daishin Seiki Corp. of Japan.

Full-Process Start to Finish

Click here to view the embedded video.

5-Axis Milling in Real Time

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