Measurement & Inspection
bone screws along the helix angle, the preferred method. “You might measure it 12° towards and away from the camera and we can focus on the whole bone screw at once,” he said. Craniomaxillofacial components—complex curved implants
for face and head applications—are another important com- ponent of his business.
Medical devices implanted in the body tend to be small. CNC machines make many of them and a growing trend is to measure parts directly on a CNC machine to provide control for in-process machining. This would then require on-machine probes that are small as well. The new M&H subcompact infrared 40.50 probe from Hexagon Metrology (North Kingstown, RI) seems ideal. “Medical manufacturing can be very complex, and the more complex the geometry of the part, the more valid this probe is,” said Adrian Johnson product manager for Hexagon Metrology. The entire probe is the size of a thumb drive. Suitable for three-, four-, or five-axis ma- chining, it boasts a repeatability of ±1 µm to 1 σ. “This probe is good for any part that has a free form, compound surface with an organic shape. Orthopedics, for example, such as knees, hips.” He also notes that this type of process is best in repetitive, high volume applications.
Targeted Applications
Precision, Quality, and Reliability
+ Oversized fl ange is integral to the spindle, providing debris protection for the front seal and bearings.
+ Ultra high precision, hardened and ground drive gear for smooth, quiet
operation and long life.
+ Axial spindle is manufactured utilizing S7 tool steel - providing superior strength, rigidity, and abrasion resistance. Competitive product typically uses lower grade alloy steel.
+ Collet pocket run out is certifi ed less than 2.5 microns - industry leading precision.
WWW.COMMANDTOOL.COM
There is a new trend to build spe- cialized, purpose-built machines that excel at one application. One example is the Marposs Orthoflex system. “We recognized that there was a problem in the super-finishing operations of certain orthopedic implants, such as hip, shoulder, and knee joints,” said Luca Trevisani, technical manager for Marposs (Auburn Hills, MI.) These biomedical implants cannot tolerate any surface scratch or defect since a perfect finish is vital to longevity. “These implants are expected to last many years in someone’s body but those tiny defects affect their lifetime,” he said. Today, humans inspect them manu- ally at end-of-line, rejecting those with
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ManufacturingEngineeringMedia.com | May 2014
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