On Fri, 9 Nov 2012 16:00:42 -0600, you wrote:

>I think there may be some confusion here.  No one is saying that Tx causes or 
>should cause tools to change on a milling machine.  This is lathe behavior 
>only.  

Correct.

Most common on commercial mills I've had dealing with, Txx pre selects
the tool and M6 actually does the tool change. G43Hxx applies the
offsets.

The T command can be many lines before the M6. Ideally it should be
enough lines so the machine doesn't have to pause waiting for the
carousel to get the tool to the load position.

On lathes the format is usually

Txxxx

Where the first two numbers denote the tool or position number and the
second two denote the parameters postion in the tool table. The tool
change takes place immediately on receiving the command.

for instance 

T0205

Where the tool is in postion 2 and it reads the offsets etc from the
fifth line in the tool table.

M6 is not normally used unless the lathe/machining center has an
external carousel.

Steve Blackmore
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