Optimal Solution Magazine 13
expand their capabilities. They were looking at a Mori and a Takisawa and came across the Doosan Puma MX. “We bought the machine because I’d always wanted a machine shop in a box, really the combination of two lathes and a mill with a B-axis and an automatic feeder on it — all in one package,” Arnot says. “And Matt said you can buy the machine providing you can find a part to run on it. And the AR-15 bolt carrier was the perfect candidate.
“Plus, we looked at the success we’d already experienced with our Doosan MV5025/50 vertical machining center, which runs 20 hours a day every day of the year. The Doosan MV really kicks butt and is a fantastic workhorse.”
Matching Technology to the Job Arnot
says, “We spec’d out Matt and Arnot Heller, owners of Detroit Gun Works the
Puma MX as the perfect machine to manufacture the bolt carrier. The reason is that it’s an 8620 part, and we needed the horsepower that we can get from a Doosan. Another factor is the rigidity required to hold tight tolerances on
machining to get our cycle time as low as possible to make this component. Finally, the Puma MX is a great machine because
these parts require
We bought the machine because we always wanted a machine shop in a box.
the OD that runs back and forth in the upper receiver, as well as holding the concentricity and tolerance requirements on the ID. In addition, the part includes some pretty significant milling features, so the B-axis allows us to do both the turning and milling in a single setup.
“We use over 100% of the torque and the full 12,000 RPM on the B-axis to mill flats on the back and front sides, as well as using four-axis capability to do cam slots. We also have high- pressure coolant through the B-axis, which allows us to get incredible tool life in the small holes that we drill in the part. So, not only do we use the left spindle but we also pass the part off to the right spindle to get the part in a single hold, and use the upper and lower turrets to do simultaneous
ride correctly back and forth. The Puma MX is rigid enough to allow us to do the hard turning at the same time as we’re running the other primary operations.”
Expectations & New Directions The Doosan Puma MX 1600 ST is a good example of how DGW has changed over the last year or so. It’s a very technical piece of equipment that requires skilled labor to run — not just button pushers, but rather people who can visualize how to run a part. On this particular machine there’s probably 100 different ways that you could run the same part because of the machine’s versatility. The trick is how to optimize that kind of flexibility and versatility.
“This is really a highly technical gateway machine, in that it can open avenues to
hard
turning on the ID of the three diameters on the one end, which allow the bolt to
many other industries and applications and consequently many other types of customers,” Arnot says. “The reason we purchased this piece of equipment was because this is where we see the direction of our company going, in terms of value added services, engineering, design for manufacturing, and making components that other people cannot make.
“DGW is now running two shifts a day, and because of automation we run the machines untended during what would be a third shift. This is great machine utilization, and we couldn’t achieve this without a machine capable of performing under the pressure based on our customers’ demand.”
Arnot summarized by adding, “The emphasis for DGW will continue to center around building out new core competencies with a focus on using best practices in lean manufacturing, sophisticated cutting-edge technologies, robotics, and automation. These are our core beliefs, and we believe, this is how we can best serve our customers cost containment and quality needs.”
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