Dan,
I don't know if you are going to get much discussion here on this
fundamental topic. Your question is so complicated that it is usually answered
in CNC classrooms or CNC books with lots of diagrams. A text based forum is a
poor substitute for these. As far as You Tube is concerned, that is also not
the place to learn the fundamentals of tool length compensation and cutter
radius compensation and the relationships of CAM and CNC tool tables. That's
why you can't touch an industrial CNC machine without a certification. At
least not in a "for profit" shop. : )
It will only lead to frustration if you rely on these for your clear
understanding of your tool "cribs". Also, a ballnose endmill is used for 3
axis contouring, and I would not even attempt that until I had a solid
knowledge of 2 1/2 axis profiling, including tool table set-up in CAM and CNC.
I don't know your background so please don't take this wrong, but I do know
that there are better ways to get your questions answered than just asking
questions in a forum.
Good luck
jim
-----Original Message-----
From: Dan Field [mailto:danfi...@roadrunner.com]
Sent: Thursday, December 15, 2011 3:01 PM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] tool table definitions
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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