Machining Equipment Device can drill with high-precision at the micro level
For precision micro drillings, Joke Technology is presenting a device for honing and reaming as well as drilling blind and through holes with diameters up to 0.2 mm.
According to the company, the device is suitable for different industry sectors, including medical engineering or microsystem technology, where instrument dimensions are becoming constantly smaller. In order to manufacture intricate components and screws that cannot be machined on a machining centre, Joke has developed this device for high-precision micro drillings together with the surgical instrument firm Michael Strub.
According to Joke, the versatile and extremely precisely adjustable drilling device is combined with a Joke Eneska handpiece as the drive unit. In a first stage, the handpiece is positioned, which is infinitely adjustable in height. Instead of lowering the drill into the part to be processed, the workpiece is raised towards the tool. By means of a micrometre screw, the stop can be precisely adjusted to 1/100 mm, the company said. Moreover, a friction clutch prevents further transmission of force. The workpieces can be accurately positioned on the workpiece by means of a stereo microscope, with 10 x magnification as standard, the supplier explained. The microscope can be ideally adjusted to any user by a telescopic arm. A cold light source for optimum illumination is available as an option.
The Eneska handpiece, which can deliver up to 40,000 rpm, is combined with a step-down gear in order to achieve a higher torque, the company said. As a consequence, Joke noted, drilling tools with a reinforced shaft and shortened helix, usually HSSE NC bits, can be used. With their short cutting edges, they are self-centring and remain true running even with slim diameters, according to the supplier. Consequently, speeds of 10,000 or 11,000 rpm are usually said to be sufficient, even with stainless and acid-resistant steels used for surgical instruments. Burr formation and initial deformation are therefore mostly avoided, the company said.