Microdrilling is one kind of processing method ,which is used for precise rotation of the microdrill and a special drilling cycle. Besides that, the walls of a microdrilled hole are among the smoothest surfaces produced by conventional processes,which is due to the special drilling cycle called a peck cycle. The smallest microdrills are of the spade type. The drills do not have helical flutes as do conventional drills and this makes chip removal from the hole more difficult. Drills with a diameter of 50 micrometers and larger can be made as twist drills. Drills smaller than this are exclusively of the spade type because of the difficulty in fabricating a twist drill of this size.
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