[TheForge] Fw: Cutting tool angle

[David E. Smucker]

> I have always used a sharp tool with a negative rake for copper and
> brass (and aluminium for that matter)
>
>
> Charles

Charles has it correct -- I said it backwards.  You want a negative rake 
angle for copper and brass to keep from grabing,

"Back Rake Angle -- If viewed from the side facing the end of the workpiece, 
it is the angle formed by the face of the tool and a line parallel to the 
floor. A positive back rake angle tilts the tool face back, and a negative 
angle tilts it forward and up."

As to sharp vs "dull" the old guys I learned from, would take the sharp tool 
and just break the edge with a very fine stone.   So the tool is sharp but 
with just a slight radius at the tip.  Always worked for me.

Thanks for pointing this out Charles

Dave

--------------------------------------------------
From: <xlch58 at swbell.net>
Sent: Tuesday, July 28, 2009 9:52 PM
To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net>
Subject: Re: [TheForge] Fw:  cutting off copper ferrules?

> David E. Smucker wrote:
>> Jerry is right, a dull tool works better on copper or soft brass than a
>> sharp one.  Also try a positive rake angle on you cut off tool.  Also 
>> helps
>> to turn a wood or plastic plug and place into the id of the tubing.  (Or 
>> you
>> might find a wood doll that is just the right size.)  With the plug in
>> place -- back into the chuck, then you can hold the other end with the 
>> tail
>> stock which alows you to use more cutting force.  Use soap or wax as a
>> cutting lub.
>>
>> If you can find copper that isn't dead soft that also helps.
>>
>> I don't think you have one since you don't do any welding but a plasma
>> cutter just might work too.  You would clamp the cutting torch and turn 
>> the
>> work piece.
>>
>> Dave
>>
>>
> I have always used a sharp tool with a negative rake for copper and
> brass (and aluminium for that matter)
>
>
> Charles
>
> ______________________________________________________________
> TheForge mailing list
> Home: http://mailman.qth.net/mailman/listinfo/theforge
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:TheForge at mailman.qth.net
>
> TheForge mail list group photo site is
> http://www.photoaccess.com
> Login: blacksmithblacksmith at hotmail.com
> Password: anvil
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>