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1. make sure both Y spin in the correct direction
2. what sensing distance do the proximity switches have? 1 and 2mm should be avoided. And switches are not mounted correctly, they should be sideways to prevent crashing into stuff.
For 1:
make a normal 3 axis test config, test one Y with a short jog, change drive inputs and test second Y with a short jog.
This can be done on software but more complicated to explain.

www.welectron.com/Motion-Controller

www.linuxcnc.org/docs/html/gcode/m-code.html#mcode:m68

See the note about the hal pin.

Looks like meister was using different numbers for different positions
some likely being fully open and some fully closed

Hi All

I have an issue with getting XYYZ gantry to home (using 7i92t with 7i76u)

Home position is at bottom left of the work area.

I am trying to use the second option,  of the four homing sequences,  found in Figure3. Homing Sequences. (stop, back, forward, home)

Order of homing is Z (micro switch), then X (micro switch),  then Y gantry (proximity sensor on both ends of gantry, Y and Y1).

The Z axis homes correctly.

The X axis homes correctly.

The Y gantry axis moves in the correct direction, towards the two proximity sensor stops.
The gantry stops for a spit second, as it find the proximity sensor stops.
The Y motor looks like it tries to begin to do the correct four step process (stop, back, forward, home), and it doesn’t ever crash.
However the Y1 motor side of the gantry, just continues straight forward, and crashes the machine every time, with a hammering sound.

Context:
The two switches, and both proximity sensors, provide +24v to the four inputs on the 7i76u.
in pncconf I had to invert the four inputs, otherwise all four inputs triggered before one began.
In halshow the switches and the proximity sensors all seem fine (to me).

I have negative values on all axis (see attached ini and hal), if I change these to positive, then it homes in the wrong direction.

Any ideas for troubleshooting greatly appreciated

I also tested the default qtplasmac preamble instead of the preamble outputted by the pronest post pro to see if that had anything to do with it but didn’t change anything.


(test2)
(5/22/2025 2:07 PM)
(ProNest LT 16.2.0.9215 PostBuilder 2.88 Linux CNC PlasmaC)
N10 G20
N15 G40
N20 G49
N25 G64 P0.01
N30 G80
N35 G90
N40 G92.1
N45 G94
N50 G97
N55 G0 X3.088 Y3.9014

(0.375--1--D751-0243-00-Default - Seq 1)

N60 M190 P1 (Select material 1)
N65 M66 P3 L3 Q1 (1s delay to allow material selection)
N70 F#<_hal[plasmac.cut-feed-rate]>
N75 M3 $0 S1
N80 M68 E3 Q20 (Set to 20% feed)
N85 M62 P2 (Disable THC)
N90 G3 X2.8229 Y3.6363 I-0.1325 J-0.1326
N95 G3 X2.8229 Y3.6363 I0.4329 J0.4329
N100 G3 X3.088 Y3.6363 I0.1326 J0.1325
N105 M68 E3 Q100 (Reset to 100% feed)
N110 M5
N115 M65 P2 (Enable THC)

N120 G0 X0.7118 Y0.4627
N125 M3 $0 S1
N130 M63 P2 (Enable THC)
N135 G1 X0.7118 Y0.8377
N140 G1 X0.7118 Y5.8999
N145 G1 X1.2376 Y6.4257
N150 G1 X4.274 Y6.4257
N155 G1 X5.2998 Y5.3999
N160 G1 X5.2998 Y1.8635
N165 G1 X4.274 Y0.8377
N170 G1 X0.7118 Y0.8377
N175 G1 X0.4618 Y0.8377
N180 M5

N185 G0 X0.0 Y0.0
N190 M30

I can figure out why my feed rate percentages and thc on/off isn’t working. Feed rate is just constantly the same and doesn’t change unless I change it manually and thc doesn’t turn off unless I turn it off manually. The g code commands are doing nothing. G code attached bellow. I made a new install media with 9.4 and reinstalled linuxcnc completely just to make sure I wasn’t out of date with anything. 




(test2)
(5/22/2025 2:48 PM)
(ProNest LT 16.2.0.9215 PostBuilder 2.88 Linux CNC PlasmaC)
N10 G20
N15 G90 G40
N20 G17 G91.1
N25 G64 P0.01 Q0.01
N30 M52 P1 (Allow paused motion)
N35 M52 P0 (Disable paused motion)
N40 M65 P2 (Enable THC)
N45 M65 P3 (Allow torch on)
N50 M68 E3 Q0 (100% feed)
N55 G0 X3.088 Y3.9014

(0.375--1--D751-0243-00-Default - Seq 1)

N60 M190 P1 (Select material 1)
N65 M66 P3 L3 Q1 (1s delay to allow material selection)
N70 F#<_hal[plasmac.cut-feed-rate]>
N75 M3 $0 S1
N80 M68 E3 Q20 (Set to 20% feed)
N85 M62 P2 (Disable THC)
N90 G3 X2.8229 Y3.6363 I-0.1325 J-0.1326
N95 G3 X2.8229 Y3.6363 I0.4329 J0.4329
N100 G3 X3.088 Y3.6363 I0.1326 J0.1325
N105 M68 E3 Q100 (Reset to 100% feed)
N110 M5
N115 M65 P2 (Enable THC)

N120 G0 X0.7118 Y0.4627
N125 M3 $0 S1
N130 M63 P2 (Enable THC)
N135 G1 X0.7118 Y0.8377
N140 G1 X0.7118 Y5.8999
N145 G1 X1.2376 Y6.4257
N150 G1 X4.274 Y6.4257
N155 G1 X5.2998 Y5.3999
N160 G1 X5.2998 Y1.8635
N165 G1 X4.274 Y0.8377
N170 G1 X0.7118 Y0.8377
N175 G1 X0.4618 Y0.8377
N180 M5

N185 G0 X0.0 Y0.0
N190 M30

Looks like the VFD (or I/O module) does not supply 10V, but it does
supply 5V and you can set the input to accept 0 to 5V instead of 0 to 10V

7I76           Drive

SPIN+        9      (+5V)
SPINOUT    1U    (VIN)
SPIN-          7      (GND)


My guess on the others is that:

28 is drive-on  (wire +24 to 7I76 ENA+ and 7I76 ENA- to 28)
59 is +12 to +24V power (same as 7I76 field power)
7 is GND (same as 7I76 field power GND)
A1 is an output (wire to a 7I76 field input)
Might be a fault or at-speed indication, need to look at
the drive settings to know.

2U is another analog input, no real idea what this was doing
but if you look at the current drive settings, it may give you a clue.



 

Please do you have any more details on this?
How do you use the M68 to open?
How do you use the M68 to close?
Do you have M68 (number value)?

Hi DarkPhoinix,

The Step Length and Step Space need to be integers / whole numbers. So go with 5 and 3.

Hi, I my name is Chrstian and I tend to read more on forums than to write. But as many others I am in some kind of a dead end and could use some advice...

Backstory:
I bought an used self build CNC Router. The controls were build around an USB Smooth Stepper and Mach3. Since the controls are not repair friendly (too much stuff packed in too little space with custom layout boards and same color wires) and I am more a Linux than a Windows guy, I am in the process to upgrade to LinuxCNC.

I use an 7i92 and an 7i76

One of the last steps missing is the spindle control (1,5kw china spindle with ER16). For some reason the person, who built the router went with an "Lenze 822MV" 400V 2,2kw VFD.

After the long introduction, my question:
Where can I get my 10V reference (Spindle +) from this VFD? If someone might take a look and give me a hint, I would appreciate it.

The manual for the "Application IO Module" that is used, can be found here: www.becker-antriebstechnik.org/WebRoot/H...__v6-0__DE_EN_FR.pdf
(page 21 starts the english description)

The manual for the actual VFD (should not matter that much, just in case):https://www.lenze.com/en-de/products/inverters/previous-products-inverters/8200-motec

Currently connections A1, 2x7 (GND), 59, 28 and 2U are connected. I have absolutely no Idea where they go to...

In case the VFD does not have an 10V reference voltage, what are my options? Do the cheap 20€ 4channel 2,5V, 5V, 7.5V, 10V reference voltage things from ebay work?
Am I missing something?

Thanks in advance for the help (and all the help I got from the forum without having to ask).

Christian aka TheRealMable

At a later stage, I plan to add an additional 1kW servo motor, which will operate in torque mode to act as a dynamic load on the main 7kW motor. This will increase the system's rigidity. Currently, I'm using the encoder from the main motor

I don't have copy on hand, but if you search through my posts you should find some of the later caxis.comp configs attached.  Maybe 4-6 months ago or so?

I tried step/dir and pwm, so there may be examples of both attempts somewhere in the forum.

Something to keep in mind is that for rotary axis work you want the highest resolution encoder (or resolver) you can get.  NoJo (OP) I think reported problems with C-axis milling and feature alignment due to a moderate-count encoder.

Of course, high counts and a high-speed spindle means problems with max input speed.  I wound up with a 10k-line encoder on my 3500rpm spindle... which works but I had to turn off Mesa input filtering.

Another issue I think I encountered with NoJo's polar kinematics was that he hard-coded the live tool offset in to the component.  He only had a single live tool so that worked for him, but a re-write which uses a tool offset from the tool table might be wise.

Update
1.variable pulse width for the step generator (1000nS - 6000nS) set from hal pin.
2.work with pico + w5500 module (connections like in the w5100s-evb-pico)
 

Hallo zusammen,

ich plane aktuell eine Sammelbestellung für Mesa-Karten (z. B. 7i76e, 6i25, etc.), da sich bei größeren Stückzahlen häufig günstigere Konditionen ergeben – sowohl beim Preis pro Karte als auch beim Versand.

Rahmenbedingungen:

Ziel: mindestens 10 Karten

Bestellung erfolgt gesammelt direkt beim Hersteller
!!!Vorkasse notwendig, damit ich nicht auf den Kosten sitzen bleibe!!!
Ich übernehme die Organisation und den Versand innerhalb Deutschlands

Preise sind noch nicht final, je nach Anzahl & Modell

Wer Interesse hat, bitte folgende Infos per E-Mail an "This email address is being protected from spambots. You need JavaScript enabled to view it.":

Betreff: [Name, Vorname]   [Modell]  [Anzahl]
z.b.:      [Lauterbach, Elias] [7i76e] [3]

Als Text dann den Versandort (Packstation Möglich)

Alles weitere erfolgt dann per E-Mail

Wenn wir genug zusammenbekommen, gebe ich die finalen Preise bekannt und sammle dann das Geld ein, bevor bestellt wird.
Ziel ist eine faire, transparente und zügige Abwicklung.

Viele Grüße
Elias Lauterbach

Thanks for the update. Then I will try without polar coordinates.I would be happy if you could share the configuration. Because I did not find an example of a spindle and C axis with +-10v control.
My lathe doesn't have an index yet and can't make threads. Because I want to install a hydraulic chuck first.