"Wayne" wrote in message
...
Randy333 wrote :
On Wed, 23 Mar 2011 08:19:50 -0700, "Bob La Londe"
wrote:

In the drill bit thread one person (atleast) mentioned 118 degree drill
bits. Many of the sets listed for sale (those that say) are 135 degree.
What is the significant difference? (Other than 17 degrees. LOL.)


118 degre is a standard point, 135 degree is usually a split point
which is self centering.

I put split points in my 118's all the time. So there has to be more
difference than that.

Wayne D.

I think it has more to do with type of material being drilled than anything
else - as a kid I remember seeing a chart pinned up behind the school
drilling machines with material, point angles and speeds.

For some reason I know that drilling cast iron is best done with a 90 degree
point angle.