On Sunday, March 23, 2014 6:56:17 PM UTC-7, John B. wrote:
On Sun, 23 Mar 2014 12:39:42 -0700 (PDT), "

wrote:



On Sunday, March 23, 2014 12:44:54 PM UTC-4, jon_banquer wrote:

On Sunday, March 23, 2014 4:40:07 AM UTC-7, John B. wrote:









Twist drill are not considered precision hole making tools. If you







require precise holes then you need to start thinking of reaming,







boring, internal grinding, etc.







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Cheers,















John B.











Spoken like someone who reads a textbook rather than someone who learns in a machining job shop how to use a drill to get the job done because time is money.







There is often no reason to ream or bore a hole.



Spoken like someone who can not comprehend the written word. John said "If you require precision holes". You must consider precision as being within a few thousandths. But if you are building a model engine, drilling holes is not going to hack it.



Dan



Now, now. Jon is an educated metal worker. He spent considerable

effort to educate us that HE once took an adult education course in

metal working.



(of course, from his posts it is obvious that he failed the course)

--

Cheers,



John B.

I've spent 20 plus years working in machining job shops. About the best you can do get on your knees and blow Mark Wieber for clues.