Precihole (exhibiting with Absolute Machine Tools) offers its Micro gundrilling machine with capabilities engineered to suit production of precision medical implants. Gundrilling produces straight, accurate and deep holes, and is the preferred method for making holes with L-D ratios of 10 or more in medical implants, the company says. This includes cannulated intramedullary devices (having through-holes for fluid or wire) such as nails and screws, as well as cannulated drills and other instruments.
The gundrilling machine uses drills in diameters ranging from 1 to 6 mm (0.04" to 0.25") in order to produce holes 300 mm (12") deep in components with outer diameters ranging to 40 mm (1.5"). Two 1.1-kW (1.5-hp) spindles operate at speeds ranging from 1,000 to 25,000 rpm at feed rates ranging to 1,000 mm/min. (40 ipm). Component counter-rotation is said to ensure straightness. Options include tool wear/breakage monitoring and multiple tool steadies.
All of the company's gundrilling machines use linear motion guideways, high-pressure recirculating coolant systems, centralized automatic lubrication and full machine guarding. The company also offers a range of tools and accessories, including gun drills, guide bushes, whip guides and cone locators, as well as tool presetting and regrinding machines.
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