How to enter tool lenght

Hi if someone could explain or give a link how to measure tool length using a ER20 and tool setter for first time to enter the length in the tool library , tool setter working using Flexgui with M6 remap working if there is a gcode example someone could show me ?

Thanks Fred 

Never mind I was able to figure it out.

OK so I do need help ive tried using this gcode to setup tool measurement but not getting accurate results from first tool I zero off work coordinates go through the gcode but the next tool comes out a few mm above work piece maybe more i didnt mesure the distance but in the gui window its at zero and in the G offset its zero.

What am I dong wrong ?  Please can someone give me the correct way of doing this.

Thanks Fred



g49

(measure reference tool)
G91
g38.2 z-190 f250 (measure)
#1000=#5063 (save reference tool length)
(print,reference length is #1000)
G90
G0 G53 Z0 (Retract to safe height)



(msg,insert another tool)
M61 Q

(measure next tool)
G91
g49
g38.2 z-160 f250 (measure)
G10 L1 P#5400 Z[#5063-#1000] (set new tool offset)
(print,new length is #5063)
G90
G0 G53 Z0 (Retract to safe height)


 

I wrote a lengthy bit on tool offsets here:
forum.linuxcnc.org/38-general-linuxcnc-q...ets-be-stored#342300
it might help a little. Took me a while to "get it"
What I ended up doing is probing each tool and subtracting an arbitrary absolute Z height from the absolute probe Z, so every tool has a "length" that's relative to an arbitrary spindle position. It means no more reference tool, but it also means I always measure tools when I pick them.