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.)

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.

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.

"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.

On Wed, 23 Mar 2011 17:28:45 -0500, Wayne
wrote:

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.



You put them on, the 135's come that way. At least most of the time.

On Wed, 23 Mar 2011 17:28:45 -0500, Wayne
wrote:

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.

=========
For more than you [probably] wanted to know about drill
point geometry.

http://www.icscuttingtools.com/the-c...t_geometry.pdf

http://www.practicalmachinist.com/vb...-angle-152137/

http://bbs.homeshopmachinist.net/showthread.php?t=40724

http://www.machinist-guide.com/drill...gle-chart.html

http://www.nouvaltools.com/operating...CAL_GUIDE.html

http://www.mmsonline.com/articles/ch...point-geometry

enjoy


-- 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).

On 3/24/2011 7:39 AM, F. George McDuffee wrote:
On Wed, 23 Mar 2011 17:28:45 -0500, Wayne
wrote:

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.

=========
For more than you [probably] wanted to know about drill
point geometry.

http://www.icscuttingtools.com/the-c...t_geometry.pdf

http://www.practicalmachinist.com/vb...-angle-152137/

http://bbs.homeshopmachinist.net/showthread.php?t=40724

http://www.machinist-guide.com/drill...gle-chart.html

http://www.nouvaltools.com/operating...CAL_GUIDE.html

http://www.mmsonline.com/articles/ch...point-geometry

enjoy


-- 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."