Tool offset (for T3) not saving or loading

EducatingSavvas

Hi - I'm writing a macro to work out the offset between 3 tools on my CNC machine. A laser (T0), a spindle router (T1) and a tang knife (T3) - T2 is a drawing implement which uses the same coordinates as the spindle but will disable the spindle.

The spindle is my main tool. My problem is that I can't seem to save the G10 L1 P3 offset for tool 3.

This is my workflow:

G53 G1 Z-10
M291 P"Tool offset workflow to commence - ensure spindle head is roughly in centre of wasteboard, remove any bits in the spindle collet and tang knife head, and arm laser." R"Step 1" S3 X1 Y1	; jog to wasteboard
T0				; select tool 0 which also enabled laser mode
G1 Z0			; move to z0
G91				; relative movement
G10 L1 P0 Z-3	; subtract sacrifical material thickness - change z value as necessary
G1 X-5 H2		; move -5
G1 X10 H2 S190		; mark x axis 
G1 X-5 Y-5 H2		; move to start of second pass
G1 Y10 H2 S190		; mark y axis
G1 Y-5 H2 			; move laser head over centre of cross-mark
G10 L1 P0 Z0	; subtract sacrifical material thickness
G90				; absolute movement
G53 G1 Z-10		; Move to save z
M291 P"Remove laser head and place v-bit into spindle collet." R"Step 2" S3 ; jog to wasteboard
G10 L2 P8 X{move.axes[0].machinePosition} Y{move.axes[1].machinePosition}		; Set current spindle location to X0 Y0
M291 P"Jog spindle collet so v-bit locates laser mark" R"Step 3" S3 X1 Y1 Z1 ; jog to wasteboard
G10 L2 P9 X{move.axes[0].machinePosition} Y{move.axes[1].machinePosition}		; Set current Laser location to X0 Y0
G10 L1 P0 X{move.axes[0].workplaceOffsets[8]-move.axes[0].workplaceOffsets[7]} 
G10 L1 P0 Y{move.axes[1].workplaceOffsets[8]-move.axes[1].workplaceOffsets[7]}
M400		;
M500 P10	; Save tool 0ffset
G53 G1 Z-10
M291 P"Remove V-bit from spindle collet and install v-bit in tang knif head" R"Step 3" S3 ; jog to wasteboard
M291 P"Jog tan head with v-bit to locate laser mark" R"step 4" S3 X1 Y1 Z1 ; jog to wasteboard
G10 L2 P6 X{move.axes[0].machinePosition} Y{move.axes[1].machinePosition}		; Set current tang head location to X0 Y0
T3		; Select tool 3
G10 L1 P3 X{move.axes[0].workplaceOffsets[8]-move.axes[0].workplaceOffsets[5]} 
G10 L1 P3 Y{move.axes[1].workplaceOffsets[8]-move.axes[1].workplaceOffsets[5]}
M400		;
M500 P10	; Save tool 0ffset

I'm finding tool 0 offset is saved but I can't seem to recall the offset for tool 3. I can see it is correct from the status information when T3 is selected, but swapping off and back to the tool seems to remove the offset. I've tried adding this manually to the config-override.g file and saving with both M500 and M500 P10 but T3 offset is not applied after rebooting. Have I missed a step? Can more than one tool have a saved offset?

EducatingSavvas

Tool offset calibration for more than one tool not saving*

Phaedrux

Just in case it's a syntax error in the macro, can you manually send G10 for tool 3 with actual numbers and see if it saves/loads?

EducatingSavvas

@phaedrux Hiya - I think I've worked it out. I had to add M501 to all the tpre#.g and that has allowed me to swap between the tools and to keep the offset. I also added M500 P10 to all the tfree#.g but I'm not sure I need that as I'll rely on the workflow to set those. It's a bit confusing because I do have M501 at the end of my config file and I could see the offsets were in the config-override.g file.

I'll test my macro again this weekend to make sure everything works properly but I think it was a simple one this time. Many thanks.

dc42

@educatingsavvas said in Tool offset (for T3) not saving or loading:

I think I've worked it out. I had to add M501 to all the tpre#.g and that has allowed me to swap between the tools and to keep the offset.

That should not be necessary, unless you have another G10 command somewhere in your tool change files (or elsewhere) that alters the offset.

EducatingSavvas

@dc42 Yes I do - I use a different macros to set the Z zero which I save too and recall from other work coordinates when the tool is selected.

I have the following in tfree0.g (although this should move to tpre1.g come to think of it)

G10 L2 P2 Z{move.axes[2].workplaceOffsets[5]}		;

and this in tpre0.g

G10 L2 P2 Z{move.axes[2].workplaceOffsets[7]}		;

and will possibly need a second and third for the drawing tool, and tang knife depending on how I manually set the tools zero on the waste-board.

@phaedrux I think in a few more weeks I should be ready to share my system files as an example of using the duet for CNC. Is there is a good place and way to do that?

jay_s_uk

@educatingsavvas you can now use global variables to store values rather than using my hack to use workplace offsets

Phaedrux

@educatingsavvas said in Tool offset (for T3) not saving or loading:

@phaedrux I think in a few more weeks I should be ready to share my system files as an example of using the duet for CNC. Is there is a good place and way to do that?

Indeed there is.

https://github.com/Duet3D/RRF-machine-config-files

Though a post in the CNC forum would likely get more direct visibility.

EducatingSavvas

@jay_s_uk Hi Jay! I still haven't had time to look into how global variable work. The WC hack has been a great though - thanks again for chiming in previously. I'm using a simpler method for probe to waste-board height but it has been great. It's amazing to get the functionality of an industrial standard CNC machines with a open source platform.

jay_s_uk

@educatingsavvas I've not had chance to try them yet either as my CNC is in bits. Hopefully soon I'll be back to tweaking my settings