Setting the Home Machine Coordinates

[jgrush]

Greetings -

I am confused and perhaps I am just using the wrong terms but this issue seems to be something that would be addressed during the initial installation or conversion. Namely, how are Machine Coordinates set? I have stared at the manual and looked through the forums but perhaps I just do not know how to ask the correct question.

I have a Sherline mill that I converted myself. It has limit/home switches at the +X & +Y and +z positions and approximately 7" of x, 3.5" of y and 10" of z travel. It homes and shows machine coordinates of 0,0,0. That means that at the extreme of the travels for each axis you see machine coordinates of -7.000,-3.500, and -10.000 - a position near that table's lower left corner from the operator's point of view.

I find this confusing as you have to set travel limits, work envelope, etc.
It seems to me that when it is sent to home - it should show machine coordinates of 7.000, 3.500, 10.000 - the maximum positive position for each axis - because that is where it goes for homing.

That would seem simple to do but I have no idea where the machine coordinates reside or if they are something you can specify.

I realize that you set work coordinates separately (G54, etc) but this just seems illogical to me.

Thanks for any insights you may have.

John

[cnckeith]

viewtopic.php?t=3648

[cnckeith]

post a fresh report.zip
viewtopic.php?t=1043

[centroid467]

The machine coordinates are set by the M26 /<axis> calls in the homing program. They set the current position as zero. Any travel past zero in the positive direction is positive and vice versa for negative.

With your homing configuration, set your negative soft travel limits to -7.0000,-3.5000, and -10.0000.

Once you set your WCS offset (G54), the machine coordinates become less relevant to your daily operations.

[jgrush]

post a fresh report.zip
viewtopic.php?t=1043

Here is a report -

report_E8EB1128C3B4-0423180850_2025-09-02_11-01-17.zip

(782.9 KiB) Downloaded 3 times

attached.

[cnckeith]

Hi, thanks from the report.

machine home is not part zero.
review this post.
https://www.autodesk.com/products/fusio ... made-easy/
that describes machine coordinates and work coordinates and how wcs is relative to mcs.

from your report. travel limits are as follows

Code: Select all

CNC12 v. 4.80 coordinates file
Axis     Minus     Plus    Return     Return      Return     Return
         Limit     Limit   #1(G28)     #2(G30)      #3         #4
 X     -7.6250    1.0000    7.60000    0.00000    0.00000    0.00000 
 Y     -3.4000    1.0000    3.40000    0.00000    0.00000    0.00000 
 Z     -9.4700   10.0000    9.47000   -2.00000   -2.00000    0.00000 
 W      0.0000    0.0000    0.00000    0.00000    0.00000    0.00000 
 N      0.0000    0.0000    0.00000    0.00000    0.00000    0.00000 
 N      0.0000    0.0000    0.00000    0.00000    0.00000    0.00000 
 N      0.0000    0.0000    0.00000    0.00000    0.00000    0.00000 
 N      0.0000    0.0000    0.00000    0.00000    0.00000    0.00000

and the WCS#1 position is here. this is the distance from home to the wcs position. when at this position the DRO will read x0,y0,z0

Code: Select all

Axis    Origin    Origin    Origin    Origin    Origin    Origin
        #1(G54)   #2(G55)   #3(G56)   #4(G57)   #5(G58)   #6(G59)
 X     -5.29082    0.00000    0.00000    0.00000    0.00000    0.00000 
 Y     -3.40000    0.00000    0.00000    0.00000    0.00000    0.00000 
 Z     -9.47000    0.00000    0.00000    0.00000    0.00000    0.00000 
 W      0.00000    0.00000    0.00000    0.00000    0.00000    0.00000 
 N      0.00000    0.00000    0.00000    0.00000    0.00000    0.00000 
 N      0.00000    0.00000    0.00000    0.00000    0.00000    0.00000 
 N      0.00000    0.00000    0.00000    0.00000    0.00000    0.00000 
 N      0.00000    0.00000    0.00000    0.00000    0.00000    0.00000 
CSR  0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 

you are using a really old version of CNC12 (v4.80)
can you install and configure the latest version of CNC12? (v5.30) that way all the pointers and screen shots i send you to help you with your machine will be current and apply to your setup.

[jgrush]

Thanks for your assistance. I have the v5.30 on a thumb drive and will install it - probably tomorrow.

[cnckeith]

Thanks for your assistance. I have the v5.30 on a thumb drive and will install it - probably tomorrow.

make screen shots of the existing Wizard, copy the entire cncm directory on the cncpc to a thumb drive of another computer as a backup.
use the screen shots with the v5.30 Wizard and hand type/select the options you need and press write settings to CNC control and follow the instructions.