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.
You put them on, the 135's come that way. At least most of the time.
========= For more than you [probably] wanted to know about drill point geometry.
-- Unka George (George McDuffee) .............................. The past is a foreign country; they do things differently there. L. P. Hartley (1895-1972), British author. The Go-Between, Prologue (1953).
In the voice of Phineas Flynn, "I know what I'm going to do this evening."
PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.