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Both mechanical and laser cutting are common fabricating processes used in today’s manufacturing industries. Each method employs its own distinct equipment, and has its own advantages and disadvantages. Preference among the two usually depends on a range of factors, such as application requirements, cost-effectiveness, and production capabilities.
Mechanical Cutting Tools and Processes
Mechanical cutting, which includes tooling and machining, is a process that uses power-driven equipment to shape and form material into a predetermined design. Some common machines used in mechanical cutting include lathes, milling machines, and drill presses, which correspond to the processes of turning, milling, and drilling, respectively.
A lathe is a metalworking machine that spins material, usually with a computer-controlled motor, while a hardened cutting blade removes excess stock to create the desired shape. Cutting fluid can be used to help maintain temperature control, lubricate the moving parts, and remove debris, or “swarf,” from the workpiece.
A milling machine features a stationary cutting tool and a movable table to which the workpiece is secured. Manual or computer directions move the table around the rotating blade to make the desired cuts. Milling machines are capable of creating complex or symmetrical shapes across axes. The four main categories of milling machine are hand-milling, plain-milling, universal, and omniversal models.
A drill press is a stationary drill mounted to a table, or bolted to the floor, and driven by an
Laser Cutting Equipment and Methods
Laser cutting uses an energy emission device to focus a highly-concentrated stream of photons onto a small area of a workpiece and cut precise designs out of the material. Lasers are typically computer-controlled and can make highly accurate cuts with a quality finish. The most common laser cutters are of the gaseous CO2 or Nd:YAG variety.
The carbon dioxide (CO2) laser emits a gas discharge that serves as a medium for a light beam. It is one of the highest-powered continuous wave lasers in use today, largely due to its high output-to-pump-power ratio. Carbon dioxide-based beams fall on the infrared side of the light spectrum, with wavelength bands measuring between 9.4 and 10.6 micrometers. They are commonly used for welding, cutting, and engraving metals, as well as resurfacing biological tissue.
Unlike CO2 lasers, neodymium-doped yttrium aluminum garnet, or Nd:YAG, lasers are solid-state devices that use a crystal as a light medium. They also feature laser diodes or flash lamps that optically pump their beams, which emit an infrared wavelength of 1064 nanometers. Nd:YAG models are some of the most common lasers used in manufacturing, with applications in welding, cutting, engraving, marking, and etching a variety of materials. In addition, these lasers also have numerous medical uses.
Mechanical Cutting vs. Laser Cutting
Since laser-cutting can not only cut material but apply finish to a product, it can be a more streamlined process than its mechanical alternatives, which often require post-machining treatments. In addition, there is no direct contact between the laser device and the material, reducing the chance of contamination or accidental marking. Lasers also create a smaller heat-affected zone, which lowers the risk of material warping or deformation at the cutting site.
For a look at mechanical cutting, check out the video clip below:
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