Igor Chudov wrote:
> On Tue, Sep 7, 2010 at 10:27 AM, Stuart Stevenson <stus...@gmail.com> wrote:
>   
>> you can use the measured tool length as the number in the tool table
>> you will need to set your z zero to use the measured tool length
>>     
>
> Stuart, do you mean that I have to set my zero by "touch off"?
>   
When you start EMC2, by default, the workpiece coordinate system you 
last used
is restored.  If this was set to some repeatable machine feature like 
the vise jaw,
and you reference everything off that, that might be acceptable.  
Otherwise, it is
probably best to reset some of the workpiece coordinates for each 
fixture setup.
I can tell you of disastrous high-speed plunges into workpieces when I 
forgot to
reset the Z offset, particularly, on a new setup.
> So say I touch off with one tool from tool table, then switch tool to
> my desired cutting tool, and the cutting tool would automagically be
> adjusted vertically to compensate for difference in offsets between
> the cutting tool and the tool I used to touch off Z.
>   
Yes, if the tool lengths of all tools are entered in the table, and you 
engage tool length
offsets on every tool, then this will work.

In my system, I do it a little differently, the "master" tool has a 
length of zero, and
I don't engage the length offset on that tool (it makes no difference as 
its length
is set to zero).  To be completely uniform, then you should set the 
length of all
tools, but you have to remember to activate the length offset of that 
tool before
touching it off.


Jon

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