im used to an auto changer on a lathe, but if i use a manual dixon type toolpost . what would need to altered so that it goes to a safe place ,chuck stops etc to enable manual change then carry on?
thanks

First and most important you should read the following sections in Mach3 Turn Manual for understanding.

 8.1.1.3 G28 positions
10.7.8 Return to Home - G28 and G30
10.7.9 Reference axes - G28.1
10.1.13 Tool Change
10.7.4 Dwell – G04
10.8.3 Tool change – M06
10.10.3 Select Tool – T

Under the General Logic Configuration  ( Tool Change ) you have a choice of how a YOU
want the call for a Tool Change to be handled.
- Ignore Tool Change - Mach will ignore the M6 command in the  g-code T404  M6.
   One could think of this selection as "switch" which turns the tool change off.

- Stop Spindle. Waite for Cycle Start - Mach will use both the M6 start and M6 end macros.
 
Typicaly code content for M6Start could be:
-turn spindle off
-turn cooling off
-go to a save place for toolchange
-anounce the new tool to System for all the the new offsets


Typicaly code content  for M6End could be:
-turn spindle on
-turn cooling on
-go back to a place where it it save to restart

- Auto Tool Changer  - only the M6 start macro will be used

Now the above said.......................
Change the M6 macro to do what you want to do.

RICH