# Tool length setter

**URL:** <https://forum.onefinitycnc.com/t/tool-length-setter/26116>\
**Category:** Uncategorized\
**Created:** [March 23, 2024, 11:50pm UTC](https://forum.onefinitycnc.com/t/tool-length-setter/26116 "2024-03-23T23:50:06Z")\
**Posts on this page:** 1\
**Showing post:** 18

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [March 29, 2024, 10:34am UTC](https://forum.onefinitycnc.com/t/tool-length-setter/26116/18 "2024-03-29T10:34:44Z")

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Hey Tom, hey Tom 🙂

by the way, interesting:

> #### [T – Select Tool](https://linuxcnc.org/docs/html/gcode/other-code.html#sec:select-tool)
> 
> Tx - prepare to change to tool x.
> 
> The tool is not changed until an M6 is programmed.  
> […]  
> On some machines, the carousel will move when a T word is programmed, at the same time machining is occurring. On such machines, programming the T word several lines before a tool change will save time. A common programming practice for such machines is to put the T word for the next tool to be used on the line after a tool change. This maximizes the time available for the carousel to move.

I don’t know if someone in this forum has a cnc mill with [tool carousel](https://en.wikipedia.org/wiki/Automatic_tool_changer#Types_of_tool_changers) in their workshop, but I think some already worked on machines with one.

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