Center Drill Spec.

[mbfree]

I am looking for a reference to select a center drill to machine centers into a shaft that is over 2 inches in dia.

All the information I have specify drills for shafts upto 2 inches but not beyond that.
Does anybody have any reference that I can use for drilling centers onto big shafts?

Thanks in advance...

 

[israelkk]

Machinery's handbook

 

[JohnNabors]

Yup, page 839 in the 27th edition of the handbook.

 

[Cockroach]

The centre drill size is an arbitrary thing, typically used for alignment and holding with the headstock during machining operations.

Machinist Handbook all the way! I agree with the two (2) responses above.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

 

[mbfree]

Thank you guys!!