On Tue, 16 Mar 2010 21:53:10 +1100, you wrote:

>On Tue, Mar 16, 2010 at 10:14:45AM +0000, Steve Blackmore wrote:
>> On Tue, 16 Mar 2010 20:04:58 +1100, you wrote:
>> 
>> 
>> >Using programmed moves to and from the manual "tool-change station"
>> >seems to be quicker, as well as avoiding loss of position information.
>> 
>> That's normal - you would move to somewhere convenient with enough
>> clearance to actually change the tool. 
>
>Then how does a need for jogging during tool change arise? That's the
>bit that I don't get.

Jog down until tool touches top of job (Z0) then rezero Z axis.

Steve Blackmore
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