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Author Topic: 3D touch-probe with large offset to spindel  (Read 238 times)

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3D touch-probe with large offset to spindel
« on: August 17, 2020, 06:42:33 AM »
Hello all,

I'm new to this forum and hope that you could help me with my problem.
I have converted a manual mill over the last months to cnc. For the controller
I'm using a pokeys57cnc with mach4 hobby.
Now I have the following problem:
I build a retractable 3D touch probe which is permanently mounted to the mill
with a large offset (round about 85mm in x) to the spindle. I can't find a way
to calibrate the touch probe. Is it possible to set the Position of the precision bore to zero
but calibrate at the current position? This way i could zero my spindle und move the
touch-probe to the bore and run the calibration routine.
I hope you could help me with my problem.

Best regards,

KDRedSmith
   

Offline Graham Waterworth

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Re: 3D touch-probe with large offset to spindel
« Reply #1 on: August 17, 2020, 09:46:57 AM »
It is normal to calibrate the probe at 0,0 once that is done the exact offset from the probe to the spindle c/l can be measured using a clock and the offset stored in some DRO's

Then when setting a fixture datum the probes found position can be offset with a G10 command to correct the position ether in the probe macros or with a MDI/button command on screen.


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Re: 3D touch-probe with large offset to spindel
« Reply #2 on: September 17, 2020, 01:37:05 PM »
Hi,

sorry for the late reply. Thanks for your answer. I measured the offset between my spindle and the 3D touch probe with a clock as you suggested. I then wrote a custom button script which moves my spindle the specific amounts and re-zeros, this works fine.
But now i have an other Problem i wanted to reset my Probe offset to X0 and Y0 but with the Calibration routine I always get a wrong offset no matter how accurate it is. The only thing I need calibrated from the software is the Radius of my touch probe.

Best regards,

KDRedSmith

Offline Graham Waterworth

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Re: 3D touch-probe with large offset to spindel
« Reply #3 on: September 17, 2020, 09:47:52 PM »
Have 2 buttons one that allows for the probe/spindle offset and one that is probe centre line only.  You could also have a spindle c/l only button too.
Without engineers the world stops