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.



--



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