Homebrew PCBs

A long time ago I once had a specialty bit which was used to create a  
"donut" pad on a copper clad board, it had a pilot/drill and two  
spurs which cut the pad.

I forgot what it is called, can anyone identify it and where I can  
obtain them (preferably in a few sizes)?

-----

I also am looking for a prototyping board for a MLF-56 (QLN-56)  
package. I need a quick and dirty prototype and don't want to design  
and etch a board until I know more about the part.

My problem is that it has the ground pad underneath and I have not  
been able to find an adaptor which has that feature, has anyone made  
any for their own use and who might want to sell an extra or two?

Specifically I will be working with a Cypress CY8C24794 chip.


Thanks,

-  George

-----

George Lawrence Storm
Macintosh Applications Development
Edmonds (Seattle), Washington
E-mail: <keencoyote@...>



[Non-text portions of this message have been removed]

HI George,

It sounds like a "pad cutter", maybe part of the "slit-n-wrap" group of wire
wrap tools?

Hope that helps.

Alan  KM6VV

> 
> A long time ago I once had a specialty bit which was used to create a
> "donut" pad on a copper clad board, it had a pilot/drill and two
> spurs which cut the pad.
> 
> I forgot what it is called, can anyone identify it and where I can
> obtain them (preferably in a few sizes)?
> 
> -----
> 
> I also am looking for a prototyping board for a MLF-56 (QLN-56)
> package. I need a quick and dirty prototype and don't want to design
> and etch a board until I know more about the part.
> 
> My problem is that it has the ground pad underneath and I have not
> been able to find an adaptor which has that feature, has anyone made
> any for their own use and who might want to sell an extra or two?
> 
> Specifically I will be working with a Cypress CY8C24794 chip.
> 
> 
> Thanks,
> 
> -  George

You may be thinking of the New Jersey Islander (NJQRP) 
<http://www.njqrp.org/islanderpadcutter/index.html> that used a small 
diamond hole saw.
Similar hole saws are available from Harbor Freight, but watch for half 
price sales.
I just tried the 'brad point' wood working bits also from harbor freight 
- low cost and good results.
The brad point bit does not walk the way the hole saw did.  I can even 
work without
clamping the board to the drill press.

As a bonus the brad point bits cut perfect holes in the thinest sheet metal.

John
WA8KNE


George Lawrence Storm wrote:
> A long time ago I once had a specialty bit which was used to create a 
> "donut" pad on a copper clad board, it had a pilot/drill and two 
> spurs which cut the pad.
>
> I forgot what it is called, can anyone identify it and where I can 
> obtain them (preferably in a few sizes)?
>
> -----
>
> I also am looking for a prototyping board for a MLF-56 (QLN-56) 
> package. I need a quick and dirty prototype and don't want to design 
> and etch a board until I know more about the part.
>
> My problem is that it has the ground pad underneath and I have not 
> been able to find an adaptor which has that feature, has anyone made 
> any for their own use and who might want to sell an extra or two?
>
> Specifically I will be working with a Cypress CY8C24794 chip.
>
>
> Thanks,
>
> -  George
>
> -----
>
> George Lawrence Storm
> Macintosh Applications Development
> Edmonds (Seattle), Washington
> E-mail: <keencoyote@...>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> Be sure to visit the group home and check for new Links, Files, and 
> Photos:
> http://groups.yahoo.com/group/Homebrew_PCBs
>
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[Non-text portions of this message have been removed]

----- Original Message ----- 

From: "George Lawrence Storm" <Keencoyote@...>
To: <Homebrew_PCBs@yahoogroups.com>
Cc: "George Lawrence Storm" <keencoyote@...>
Sent: Thursday, April 13, 2006 4:46 PM
Subject: [Homebrew_PCBs] Looking for a specialty bit / looking for a 
prototyping board.


>A long time ago I once had a specialty bit which was used to create a
> "donut" pad on a copper clad board, it had a pilot/drill and two
> spurs which cut the pad.
>
> I forgot what it is called, can anyone identify it and where I can
> obtain them (preferably in a few sizes)?

Farnell stocks them, order codes 146411 and 146413.

Leon

On Thu, 13 Apr 2006 18:14:50 +0200, John Young <wa8kne@...> wrote:

> I just tried the 'brad point' wood working bits also from harbor freight
>
> - low cost and good results.
>
> The brad point bit does not walk the way the hole saw did.  I can even
>
> work without
>
> clamping the board to the drill press.
>
>
> As a bonus the brad point bits cut perfect holes in the thinest sheet  
> metal.
>
>
> John
>
> WA8KNE


I was thinking of them too.

I wish i could find brad point bits here that are HSS, for sheetmetal. The  
stupid shops only sell wood bits.
I'm seriously considering to try and grind my own from a set of normal HSS  
drills....


ST

Try http://www.wlfuller.com they have HSS brad points.

Jim

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
On Behalf Of Stefan Trethan
Sent: Thursday, April 13, 2006 9:44 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Looking for a specialty bit / looking for a
prototyping board.

On Thu, 13 Apr 2006 18:14:50 +0200, John Young <wa8kne@...> wrote:

> I just tried the 'brad point' wood working bits also from harbor 
> freight
>
> - low cost and good results.
>
> The brad point bit does not walk the way the hole saw did.  I can even
>
> work without
>
> clamping the board to the drill press.
>
>
> As a bonus the brad point bits cut perfect holes in the thinest sheet 
> metal.
>
>
> John
>
> WA8KNE


I was thinking of them too.

I wish i could find brad point bits here that are HSS, for sheetmetal. The
stupid shops only sell wood bits.
I'm seriously considering to try and grind my own from a set of normal HSS
drills....


ST


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