Probe for Center Bore with Nymolab NBS-6040

Stu_K · May 5, 2026, 1:56pm

Hey folks, I was hoping gSender would probe a bore for center. I have error free operation with my Nymolab NBS-6040 using the Generic machine type and grbl (not grblHAL). Outside zeroing with XYZ, XY, X, and Y work fine with my PGFUN 3D Probe, NC. I will be replacing it with the NO version since the Z-probe the came with the Nymolab 6040 is NO as well. I hoping this will obviate the need to switch pin invert when I switch probes. In the Probe Config portion of gSender, I do not get options to probe inside a bore to find its center. Is this function not available in gSender, not available with my machine, or is there a setting I am missing? Thanks.

KGN · May 5, 2026, 2:05pm

Not available natively. Custom macros for center probing are available via Neil Ferreri.

github.com/cncjs/CNCjs-Macros

Hole_Center

master

;Start with probe in hole, BELOW Z surface

; Wait until the planner queue is empty
%wait

; Set user-defined variables
%PROBE_DISTANCE = 20
%PROBE_FEEDRATE_A = 150
%PROBE_FEEDRATE_B = 50
%PROBE_MAJOR_RETRACT = 5  ;distance of retract before probing opposite side

%UNITS=modal.units
%DISTANCE=modal.distance


G91 ; Relative positioning
G21 ;Use millimeters

; Probe toward right side of hole with a maximum probe distance
G38.2 X[PROBE_DISTANCE] F[PROBE_FEEDRATE_A]

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Stu_K · May 5, 2026, 2:19pm

Outstanding!!! Thank you so much, Kevin!!! Gemini had me pulling my hair out convinced it was a native function of gSender. I really appreciate this macro and your lightening fast response!!! Best wishes for you!!
Stu