Articles

The expression "There's more than one way to skin a cat" certainly applies to machining. A young programmer in our shop is constantly being run in circles by the whims of those in authority. Newcomers are in a difficult position; they not only lack experience, they generally want to please everybody.

I generally consider myself to be a positive person. However, these past few weeks have tested my resolve. It's not the roller-coaster daily life as a machine shop owner, but the stark reality of losing employees and friends to serious illness that's been especially hard to take. Thankfully, illness doesn't always mean death.

Lately, I haven't been hearing much about machinist apprenticeship programs. I have been hearing about vo-tech schools, as well as job shops hiring people off the street to just push buttons. Do apprenticeship programs still exist in the U.S.? The answer is "yes!"

Barrel cutters are applied for specialized milling applications, and recent advancements in CAM software expand the use of these tools. Geometrically, a barrel cutter has a large cutting radius on its side that closely matches the curvature of a part's surface and allows a large step-over between passes. The result is cycle-time reductions of up to 90 percent when finishing while imparting fine surface finishes.

Every parts manufacturer, regardless of size, has some sort of training program, and programs are nearly as varied as the companies themselves. Whether it's something as simple as handing out a pamphlet about company policy or as involved as an apprenticeship program, it's just a given: Where there are employees, there is training. However, while some companies regard it as a necessary evil, others have found that investing in this universal necessity yields substantial benefits—and, in the long run, actually saves money.

As the plans for more and more machined metal parts include numerical surface finish specifications, the need diminishes to visually qualify that a part has, for example, "a mirror finish with no burrs" or to have the machinist with the finest touch scratch the surface with his fingernail to make sure it's "matte and rough."

Say "EDM" and most manufacturing folks think mold, tool and die work. Yet sinker, wire and hole-popping EDMs are often employed in conjunction with, or as alternatives to, traditional part-making processes, such as milling and turning.

Lasers are good for far more than slicing sheet metal and defending against alien space invaders. Without them, many of today's high-tech products would be impossible to manufacture. Microfluidic devices, integrated circuits, medical stents and catheters, automotive fuel injector nozzles are all drilled, milled, surface-textured and ablated via laser micromachining.

Ever machined parts so small that they not only fit on a penny but can sit on old Abe's nose? Cutting parts and part features in this Tom Thumb world often comes with Titanic-sized challenges, such as unexpected cutting tool breakage, deburring parts the size of typical burrs and machine tool spindles speeds that come up short. Sometimes just handling ultrasmall parts is a gargantuan task.

Two rotary axes beat 2' of stacked linear axes. That's the idea behind the new Twin Turret Generator (TTG) machine tools from Cranfield Precision. According to the company, the TTG machine offers a stiff and thermally stable design that improves machining precision and repeatability.

Arevo Labs hopes its new RAMP leads to better 3D-printed componets for the defense and aerospace industries. Arevo touts RAMP (Robot-based Additive Manufacturing Platform) as the first system of its kind optimized for 3D printing of composite thermoplastic parts. The system includes a 6-axis robot arm and end-effector hardware for deposition. RAMP can accommodate build envelopes from 1,000 cu. mm to 8 cu. m, depending on the size of the robot used. The end effector consists of a deposition head with special thermal management technology for processing carbon-fiber-reinforced thermoplastics.

Until I started working for Mitsubishi Hitachi Power Systems Americas, lifting parts was never a consideration in daily production. Previously, the parts I dealt with were small, usually never larger than a dinner plate. Lifting equipment, such as forklifts and pallet jacks, were often employed, but only to move raw materials to a machine tool or to load and unload trucks—never as part of the production process.