I like a hollow ground screwdriver tip.
  Only the hollow grind is shallow and extends a --long-- way.
   Its a very long barely hollow ground bevel, that might be confused 
with a flat ground tip.
  But it really isn't.

http://users.snowcrest.net/kitty/sgrandstaff/images/hometools/ph2.jpg
http://users.snowcrest.net/kitty/sgrandstaff/images/hometools/ph5.jpg
http://users.snowcrest.net/kitty/sgrandstaff/images/hometools/ph7a.jpg
yours scott

-- 
*******************************
    Scott Grandstaff
    Box 409 Happy Camp, Ca  96039
    scottg@s...
    http://www.snowcrest.net/kitty/sgrandstaff/
    http://www.snowcrest.net/kitty/hpages/index.html

On 2019-02-17 11:46 p.m., scott grandstaff wrote:
> I like a hollow ground screwdriver tip.
>  Only the hollow grind is shallow and extends a --long-- way.
>   Its a very long barely hollow ground bevel, that might be confused 
> with a flat ground tip.
>  But it really isn't.
>
> http://users.snowcrest.net/kitty/sgrandstaff/images/hometools/ph2.jpg
> http://users.snowcrest.net/kitty/sgrandstaff/images/hometools/ph5.jpg
> http://users.snowcrest.net/kitty/sgrandstaff/images/hometools/ph7a.jpg
> yours scott

How long then?

Don

-- 
A thermometer is not liberal or conservative. - Katharine Hayhoe

A good row does wonders for raising interest, and to be 'good' a row must have
something to be said on both sides,
  and a proper issue in the middle." - Rosemary Hill, 'Writing About the
Crafts', in The Culture of Craft, Peter Dormer, ed.

Being offended doesn't make you right.

>> http://users.snowcrest.net/kitty/sgrandstaff/images/hometools/ph7a.jpg
> How long then?

   Take a closer look. See the "flat" up the front from the tip to the 
shank?
That is actually a very shallow arc, or hollow grind.
   To get it you "rock" the driver and slide it up and down as you 
grind, until you get to the very tip.

  Whether its fancy work or just rehabbing any old driver, lay in onto 
your wheel's face and "rock it".
Work your way to the tip.

The tip you end up with is not completely parallel, which is weak,
and its not a straight sided wedge, which cams out too easy.
Its inbetween,.....................its a shallow arc.

Its also easy to do once you have tried it a couple times. ;)
     yours scott

-- 
*******************************
    Scott Grandstaff
    Box 409 Happy Camp, Ca  96039
    scottg@s...
    http://www.snowcrest.net/kitty/sgrandstaff/
    http://www.snowcrest.net/kitty/hpages/index.html

On 2/18/19 6:03 PM, scott grandstaff wrote:
>
> The tip you end up with is not completely parallel, which is weak,
> and its not a straight sided wedge, which cams out too easy.
> Its inbetween,.....................its a shallow arc.
I'm confused.  How does a shallow arc turn out to be stronger than
parallel sides?  I'm not disputing the point; i just don't understand.
>
> Its also easy to do once you have tried it a couple times. ;)

That's easy for you to say!  8-)

Ken

-- 
Registered Linux user #483005

If you ever think international relations make sense, remember this:  
because a Serb shot an Austrian in Bosnia, Germany invaded Belgium.

On 2019-02-18 4:03 p.m., scott grandstaff wrote:
> Take a closer look. See the "flat" up the front from the tip to the 
> shank?
> That is actually a very shallow arc, or hollow grind.
>   To get it you "rock" the driver and slide it up and down as you 
> grind, until you get to the very tip.
>
>  Whether its fancy work or just rehabbing any old driver, lay in onto 
> your wheel's face and "rock it".
> Work your way to the tip. 

Thanks. That's pretty much what I've been trying to do - with uneven 
results...

Don

-- 
A thermometer is not liberal or conservative. - Katharine Hayhoe

A good row does wonders for raising interest, and to be 'good' a row must have
something to be said on both sides,
  and a proper issue in the middle." - Rosemary Hill, 'Writing About the
Crafts', in The Culture of Craft, Peter Dormer, ed.

Being offended doesn't make you right.