How about this, when currently
Using the probe from top of spoiler board, when done zero is at top of spoiler boardā¦
Now if you know the thickness of your material deduct that number from the height of your probe and enter that number in gsender settings probe height.
Once you zero off the spoiler board the first time youāll now have your zero at the top of your materialā¦
All other tools probed going forward will end up with zero at top of material for the rest of the jobā¦
problem is youāll need to to remember to change material height on the next job if different.
Maybe it makes sense to have a material height entry when probing Z if it makes senseā¦, and maybe not.
Just thoughts
Nice setup. 
So what you do now is, if understand it right
Using your collars, is zero the first tool, from there you just enter a tool offset from current Z position every time thereās a tool changeā¦
I also do think what I last described would also work
It would eliminate the collars and the offsets.
And when probing you could do it right off of your table.
The tool tip would always end up on top of your material.
Vic
quick question, am i allowed to fork the program on github?
Itās open source, youāre able to do whatever you want with the code within the limitations of the license.
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WE (at the day job) using Aspire, always set Z zero to the spoil board. Even if we scratch through and leave trails, we do, the spoil board Z remains for as much as weeks. All tools are Zeroed to that height, with the tool length as the recorded variable, but WinCNC does that through macros, and I need to do that with Gsenderā¦ or you do and teach me how.
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Welcome to the group Rob!
That sounds like a nice setup at work, but who wants to be there 
Youāve got me thinking nowā¦ 
I think I just I had an idea! 
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I will assume you didnāt got my point for this.
Hereās a short explanation.
I want to eliminate the probing after every tool change, and only probe at the beginning with a 3d probe.
And the more Iām thinking about this and how I would make it, the simpler it gets, it only has to be something like an add-on in g-sender that manipulates the z axis current numbers without actually moving it. It doesnāt have to do with grbl or anything.
I just wished I could code 
I canāt code either, but thatās what I do for a living so: at the day job, when I refresh my spoil board, I set Z zero to the top of the new board (vacuum on), using any one of ten (donāt be jealous of my privilege) tools, then let the macro set all tools to that zero using the ātool setterā. (they call it the calibrate switch, but you get the point). Once that has been done, we donāt have to re-check tools until any parameter changes. Iām sure we can help Sienci set this up. Iām looking forward to it.
What CAM program are you using?
Iām using fusion 360, Iāve used it for the last 3 years. Learned it pretty quick in terms of basic sketch since Iāve used Freecad about 8 years ago
Using Fusionā¦You could potentially add a āManual NCā to handle the offsets on tool changes. I posted about this for a different reason on another forum here.
To do this with a gSender macro and more like a tool table, I think you could use a ānestedā ternary statement (I donāt know if thatās what theyāre called).
%global.tool = Number(tool) || 0
%toolOffset = global.tool == 1 ? -1: global.tool == 2 ? -2: global.tool == 3 ? -3: global.tool == 4 ? -4: global.tool == 5 ? -5: global.tool == 6 ? -6: 0
G43.1 Z[toolOffset]
This macro applies a dynamic tool length offset based on the current active tool. Please make sure you understand what you are doing if you try this. I used negative offsets in the example to differentiate from the tool numbers. There is a lot that could go wrong here, so test.
And, please, donāt use those unbalanced collars on a cnc.
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looks promising, but, i donāt even know where to start 
No worries, i am removing the āstopsā now. I also noticed that when i insert the tool in the collet it pulls in when tighten, so, that might not have been a good idea after all.
I will try to implement a tool setter/tool leghnt sensor.
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Yup, thatās how collets work.
Look at the macro I posted above. The positive numbers are the tool number and the negative numbers are the corresponding offsets. Itās essentially a tool table
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Another logical way to envision the main function in Neilās macro (not syntactically correct).
set %global.tool = Number(tool) or 0
if global.tool == 1 then %toolOffset = -1:
else if global.tool == 2 then %toolOffset = -2:
else if global.tool == 3 then %toolOffset = -3:
else if global.tool == 4 then %toolOffset = -4:
else if global.tool == 5 then %toolOffset = -5:
else if global.tool == 6 then %toolOffset = -6:
else %toolOffset = 0
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@RobLM It took me awhile to implement the idea you gave me but itās done now and you can read about it here.
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Well, I endet up finally building a z probe and a tool touch sensor with 3d printing and switches. I implemented both to work on a USB c cable that came with a 3d touch probe, so I can use one cable for all 3.
Iāll post about them later, need images first. This topic can be closed I guess.
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