[simpits-tech] cutting knobs...

[Gene Buckle]

On Tue, 22 Sep 2009, William Segal wrote:

>
>
> I guess I don't understand it because it would so much easier using a
> hydrualic Router ?
>
The problem isn't the method of cutting, it was the twist of the cutter I 
was using.

The downshear cutter geometry is designed to apply downward pressure 
against the part being cut.  This helps with holding the part down. 
During the cutting process this tends to pack the material chips into the 
channel that's left behind by the cutter.  This helps with vacuum hold 
down like I use when cutting full sheets of material.  The problem comes 
with the e acrylic.  The chips are not being thrown out of the cut and as 
a result the cutter is hitting them again, cutting them smaller and 
melting them due to the high friction.

An upshear or "O" flute cutter doesn't have this problem because it 
"pulls" the material as it cuts it, throwing the chips out of the cut.

Had I used an upshear cutter (I don't have one at the moment), I would not 
have had the re-melt problem I had with the downshear cutter.

g.



  -- 
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.

ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://www.scarletdme.org - Get it _today_!