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                           RV-List Digest Archive
                                      ---
                     Total Messages Posted Thu 03/20/14: 3
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Today's Message Index:
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     1. 05:20 AM - How to determine drill bit sharpness?  (tomhanaway)
     2. 06:41 AM - Re: How to determine drill bit sharpness?  (Hal Benjamin)
     3. 08:21 AM - Re: How to determine drill bit sharpness?  (Brian Huffaker)
 
 
 
________________________________  Message 1  _____________________________________


Time: 05:20:43 AM PST US
Subject: RV-List: How to determine drill bit sharpness?
From: "tomhanaway" <tomhanaway1@gmail.com>


Working on drilling longerons.  Any general guidelines for determining when a #40
has lost its edge?
10, 50, 100. 300 holes?

--------
RV-10. Built and sold
RV-8a. Building


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=420665#420665


________________________________  Message 2  _____________________________________


Time: 06:41:22 AM PST US
Subject: Re: RV-List: How to determine drill bit sharpness?
From: Hal Benjamin <halbenjamin101@gmail.com>


Hi Tom,

I think you should be able to get a few hundred pretty easily. When in doubt, try
a new bit to see how it compares. When it starts taking significantly longer
to drill a hole, change it out.

Hal Benjamin
RV-4 Flying

Sent from my iPad

> On Mar 20, 2014, at 8:19 AM, "tomhanaway" <tomhanaway1@gmail.com> wrote:
> 
> 
> Working on drilling longerons.  Any general guidelines for determining when a
#40 has lost its edge?
> 10, 50, 100. 300 holes?
> 
> --------
> RV-10. Built and sold
> RV-8a. Building
> 
> 
> 
> 
> Read this topic online here:
> 
> http://forums.matronics.com/viewtopic.php?p=420665#420665
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 


________________________________  Message 3  _____________________________________


Time: 08:21:15 AM PST US
From: Brian Huffaker <bifft@xmission.com>
Subject: Re: RV-List: How to determine drill bit sharpness?


On Thu, 20 Mar 2014, tomhanaway wrote:

>
> Working on drilling longerons.  Any general guidelines for determining when a
#40 has lost its edge?
> 10, 50, 100. 300 holes?

  Go by how it drills.  If you are getting long spirals of aluminum it is
sharp.  If you are getting small chips it is dull.

  Brian Huffaker, DSWL (bifft@xmission.com)
  RV-8A 80091 baffling.


 

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