On Thu, 05 Mar 2009 01:29:27 +0000, Peter Fairbrother
ASFAIK if centering for drilling then produce a hole a little greater
than the chisel point on your drill. Works for me <G>
A better option these days IMHO is to use a spotting drill, leave the
centre drills for their original purpose.
I completely agree with Richard on the use of spotting drills. I first saw them
in the J&L "flier" and thought they sounded a good idea, and so they proved to
I now only use centre drills for their ordinal purpose and for all other purpose
a spotting drill. Since they produce a conical sink without a parallel portion
guides the drill admirably. Even the great GHT admitted to breaking BS1 size
On or around Thu, 05 Mar 2009 01:29:27 +0000, Peter Fairbrother
d'you mean the little short tapered kind with a narrow nose?
I've gone off those, got some little short stub drills, which are handy for
anyway. I tend to go for one which makes a spot about the size of the
Austin Shackles. www.ddol-las.net my opinions are just that
Travel The Galaxy! Meet Fascinating Life Forms...
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.