Abstract
This paper describes development of an advanced tool setting device for diamond turning. In order to machine a magnetic recording disk substrate (Al-Mg alloy) to a mirror-finished surface of less than 0.03 μm Rmax using a diamond cutting tool, a mechanism has been developed for automatic adjustment of the tool setting angle, which is a very important factor to obtain a smooth machined surface. The adjustment of the tool setting angle, which has previously been done by skilled operators, is now automated and the angular tolerance subjected to the tool replacement has been improved to an accuracy of ± 1.4 × 10 −3 degrees. The machined surface roughness has also been improved to less than 0.03 μm Rmax. Moreover, the time required for the tool setting angle adjustment has been shortened to 5 minutes as compared to between 15 and 45 minutes required by the conventional manual adjustment.
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