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| Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Posted to rec.crafts.metalworking,uk.rec.models.engineering
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Spotting Drills
Centre drill are often used as spotting drills in the lathe
but there's a pretty wild mismatch between center drill point angles and the the usual jobber drill that follows. Special spotting drills are produced for NC use at about three times the price of similar centre drills. How do the special features work and are they worth the premium price? Some seem to be single flute designs and the included angle is usually less thqn 118 deg jobber drill angle. What's the experience in using these items and what's the reasoning behind the design differences? Jim -- Posted via NewsDemon.com - Premium Uncensored Newsgroup Service -------http://www.NewsDemon.com------ Unlimited Access, Anonymous Accounts, Uncensored Broadband Access |
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