On 12/15/2011 6:27 AM, andy pugh wrote:
> On 15 December 2011 14:06,<kqt4a...@gmail.com>  wrote:
>
>> For example how to define a 1/8" ball nose mill
> If you want to automatically compensate for the ball-radius then I am
> afraid that you can't. EMC2 doesn't know enough about the material
> shape to compensate for ball-nose (or V) cutters. All EMC2 knows about
> is the cutter path, not what is being cut.  That will always have to
> be handled by the CAM package.
>
I was or am hopeful there will be more discussion on this, I am in the 
same boat trying understand the Tool Crib ( and it's relationship to the 
CAM crib ) .  So far I have got by but....    Now I thought the question 
was just how to enter or define a 1/8" Ball Nose in EMC2 not auto 
compensate.

Agreed you set up your new tool in CAM.  I sort of looked at any 
existing examples and copied what was there changing the diameter and a 
new Tool Number.   I needed a 11/64 Ball Nose as that is what I had.  
There was a 6 mm Ball Nose already setup.

I saw that for a Ball Nose,  Flat Radius is zero,  corner radius is half 
the tool diameter so that's what I did.   Got a new tool number and sure 
enough EMC2 error msg, no Tool # 15.   So into the EMC crib, I only told 
it Tool # 15,  filled in Diameter and in comment what it was.  That's it 
and it seems to work just fine.

So now I wonder why there is even a Tool Crib in EMC?   I assume if you 
are good enough to manually enter Gcode and run from there you need tools.

That being said, I am using HeeksCNC for my CAM.  There's not a lot of 
help for the noob so I watch any youtube vids I can find.  This one 
mentions though I don't seem to have this option , EMC2  CRC and he 
calls it Cutter Compensation.    I only have a choice built in of EMC2, 
and EMC2 Simplified ( using Simplified ) ,    no EMC2 CRC.   I know if 
you know what you are doing you can teach Heekscnc any Postprocessor , 
don't know if this CRC is a Plug In or what.

http://www.youtube.com/watch?v=TcMmKdtjX7w

Hope this helps

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