We use Tycom drills at my shop. They are one of the leading companies in the circuit board drill industry. Very good drills and are most commonly used among semiconductor type parts. They all have an 1/8" shank and are brazed to the carbide drill tip itself. We use them as small as .004" up to .250. With the smaller drills (.004-.061) we use a high speed spindle adapter at about 20,000rpm in our CNC's but on a manual mill we use the spring loaded finger chuck like HuFlungDung was talking about. Hope I helped. |