An unhandled exception generally means that, in the program code, the program is not checking against every possible exception that could occur. Most likely, this exception is caused by some limit that is being exceeded (or the other way around). I would remove any files that could be associated with the program, like setting files, or even register configurations associated with that software. Also, make sure that you completely update your version of windows.

Check to make sure all of the drivers are current for your graphics hardware. Make sure that your graphics hardware works in other programs as well.

If you upgraded the Windows version, check to make sure your graphics hardware is compatible with the new version of Windows. Unhandled exception issue may be associated with graphics hardware and compatibility.

Customer Response:
I've given up on the wiped laptop and loaded the program on a different computer using windows 8. At first it won't operate my CNC until I read on Planet-CNC forum about loading the drivers on windows 8. All working now. Will run through the calibrations again today. Thanks

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I had to wipe my computer due to virus and now can not download the USB software again. I get a "unhandled exception" error message. Any suggestions?

The redLeaf CNC computer systems will have either Mach3 or LinuxCNC installed as per the customer's request. If the Mach3 license is purchased, the license file will also be installed on the redLeaf CNC computer system.

The Mach3 or LinuxCNC settings will be configured during the assembly of the system. We contact the customer to determine the drive (mechanics) and inertial (weight of gantry and other parts of the gantry) specifications in order to correctly configure the steps per inch, velocity and acceleration.

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I ordered a redLeaf with Mach3 installed. Do you guys configure any of the setting in mach3 or will I need to do that all myself?

The video showing the hookup of the large motors showed a sequence that was not correct, or I totally misread what was recommended. I hooked the first motor up that way and it would only go in one direction in a very jerky mode. I confirmed that i had hooked it up the way the video showed, disconnected the wiring that runs through to the motor and reconnected it, thinking maybe a cold solder joint was the problem. No good. I finally went to the motor page that showed a different connection pattern. I tried the one that the motor page said to do, and it works smoothly and in the right direction now.

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my motor only goes one direction. I checked all the wiring and it's correct. Any suggestions?

Text the image to 281-815-7701.

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I set up my limits in Mach3 but after restarting machine/program it does not allow me to use them, keep getting error they are out of limits. I have a picture of how they are set and worked at least one time. but not sure how to share it

Are you specifically asking for the axial load, or load on the mechanics which will drive the fence by the stepper/servo motor?

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I am trying to build a cutoff saw adjustable fence belt driven i need a linear rail 8 feet long it has a min. working load suggestions?

Yes, you will need a sensor to determine the speed of the rotation. For instance, you can use a hall effect sensor and put a magnet on the shaft of rotation. By installing the hall effect sensor near the shaft that contains the magnet, you can use this to determine the RPM of the axis and reflect this value in Mach3 using an input in your controller and setting that input in the index line item of the Mach3 input signals dialog box.

Here is a great video that shows the circuit and process:

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You can set the Index input with Mach3 Turn and check that the Index is lit on the screen, but it is not reflected in the rotation speed. Is there any way?

Are you trying to use the MPG (tab), or the keyboard for jogging the motors? You mention 0,0,0, are you trying to home the machine with the "ref all home"?

If you cannot move the motors with the keyboard, check if the jog is enabled.

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[596] I have my motors and limit switches working correctly but I am unable to get any movement from the 'jog step' so that I can set 0,0,0. What should I check

In our experience, the backlash compensation is not an ideal mechanism to solve backlash issues. It is best to resolve the backlash issue mechanically regather than through software.

Boards that handle all instructions on its own chip (which is the case for this all other USB boards) take some control away from Mach3. Without Mach3 having granular control. With that said, we do not have experience with the backlash compensation with that particular board. Our experience with backlash compensation with other boards have resulted in very poor accuracy and undesirable geometrical moves.

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Mach3 USB Interface Board, Backlash Compensation in Mach3 is not working. Does this board support the backlash function?

Does the machine move smoothly when using the keyboard to jog the machine?

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Sorry it took so long to respond. Yes the table moves very smoothly using the keyboard. I try to reinstall of the drivers but it still moves very jerky with the MPG, sometimes moving back-and-forth.


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Sorry it took so long to respond. Yes the table moves very smoothly using the keyboard. I try to reinstall of the drivers but it still moves very jerky with the MPG, sometimes moving back-and-forth.

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Hi I recently replaced my parallel port breakout bored with a USB breakout board, Motors Earl working properly but my wireless MPG is not working properly, it is jerky when to try to move across the table, is there a setting that I missed?

NC mechanical switch configuration is supported. You can download the manual from this page (Mach4 plugin and manuals):
https://buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach4-mach3-USB-ethernet-Board

The pokeys57CNC controller has input terminals and pins for limit switches on each of the 8 axes. There are three separate inputs per axis, two for the actual limits of that axis, and one for the home position.

Connect each switch between the GND terminal and its respective axis limit terminal/pin. For instance, the limit switch will typically have three leads, COM, NC, and NO. In an NC configuration, the NC connects to the terminal/pin, say, Axis 1 lim +, and the COM connects to the GND terminal.

In Mach4, in the new device wizard, make sure to specify the correct option on the home and limit switches that matches the machine configuration.



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can you use one switch per axis for home only?

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Hello, I am trying to configure Home and Limit switches using the Pokeyes57cnc and NC switches. I am confused on the procedure of setting this up. wiring to the board and setting up in Mach4. Can you direct me to a tutorial or offer some suggestions? Thanks Dale

I will need to know a bit more about your setup:

What controller are you using? What driver are you using? What motor are you using? What wires do you have the motor connected to the driver? Is the driver wired to a power supply? What is the voltage of the power supply? How do you have the controller wired to the driver for step/direction/5v/gnd? What voltage and current is the power supply rated? What is the max voltage is the driver rated?

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I can't get my motors to startThey are not hotand I think they are wired properly.There may be something in Mach3 that I'm not doing rigjht

You may need to add the m7 or m8 code to turn on the coolant or mist and m9 to turn it off. I will look further into this to see if mach3 can turn on the coolant when the spindle is turned off. I believe the coolant is a separate function from the spindle control since you may not need coolant for every material that you will be milling.

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I have tried typing M7 and M8 into the MDI with no success. I can toggle the coolant on and off using the flood control button. Water flows and the LED lights on the diagnostic page. I followed the setup instructions in the video on the Pokeys57CNC page, which includes the spindle setup page. Those videos are very helpful.

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To close this question - The M7 M8 commands did start working. I never figured out why they would not work before. I still cannot get the coolant to turn on with the spindle from the Mach3 set up. I have given up and just make sure the M command is in the g code.

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I can turn the flood coolant on using the toogle in Mach3 so Mach3 is talking to the PokeysCNC board (using output3). In spindle setup, Output3 is assigned to flood and the disable box is not checked. Output 3 is enabled and assigned to the correct relay. However, coolant does not come on when the spindle is turned on. Any suggestions about what I am doing wrong would be appreciated.

The parallel (printer cable) port is uses the computer as its main source of pulse trains to operate the motor driver directly. Parallel ports are a direct connection from the processor commonly referred to as GPIO pins (General Purpose I/O pins) and provides a convenient and powerful way to interface with the computer. The parallel breakout board is included in those kits only to condition those signals for use with the drivers.

The USB serves at the actual controller, sending the pulse trains, but the computer sends simple human readable instructions to the USB controller to tell the controller how to send pulses.

The non-technical differences that may serve as the most important information to you is that the parallel configurations allow for a wider variety of industry standard software that can be used to control the cnc machine. The USB that we offer requires the operator to use a software called Planet-CNC software which is a very well made and feature full cnc control software.

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USB Motion controller breakout board work with planet cnc software?

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what is the difference between parallel and USB electronics. I have a laptop that will run the mach3 program.

Can you send me a link to the digitizer you are using?

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Hi my names is Minh Truong I would like to said thank you very much for your video I got the system mach3 working fine but one thing I can NOT set and config the digitizer on the board IN4 I am not sure how to setup because in the Mach3 pin 14 for digitizer Please shoe me hoe to set it up for the digitizer.

Try the probe connected between the input and DCM with just wires connected to those terminals. When you short the two wires, you should see the change in the diagnostic screen.

Make sure that the probe configuration is correct:
Config -> ports and pins -> inputs tab
on the probe line, make sure the pin number matches the IN number on the controller. Make sure that the port number is 3. And finally, make sure the active low is set correctly. Toggle the active low to toggle the normally open and normally closed state of the probe.

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Nothing changes in the diagnostic screen, however the Digitize led is lit. One wire on in4 the other on DCM. If I were to put a multi-meter to any of the pins would there show any voltage?

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[575] I have my probe conected and have checked continuity but my probe does not show to be working. What else could be wrong?

If one or more motor is not responding, please follow the troubleshooting directions below:

For parallel Bob only! Make sure both the parallel and USB are connected.

Re-check wiring, and connections for continuity (no breaks in the wires) and check for correct wiring locations from driver to BoB.
Check dip switch settings on the driver.
Check components, by swapping the motors (ex. y-axis motor to z or x-axis driver and z or x-axis motor to y-axis driver) to check if motor functions on another driver.
Depending on software check step low active (mach 3) or invert pulse (planet-cnc) for the axis which is not responding.
Mach 3 - config/port & pins/motor outputs / Planet-CNC - file/settings/axes

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I have an engine NEMA 34 from Y axis on my green bull that do not response, I already check connections and everything seems to be OK, how can I check that the motor it's working properly or not?

I would recommend using a wireless pendant, like here: https://amzn.to/49nAjkg (Affiliate link)

I use this pendant on my machine and works quite well. If you have communication issues from the pendant to the dongle, there may be too much interference surrounding the dongle, and exposing the internal antenna works well. This is something I needed to do.

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[575] Is there any information on connecting and setting up a pendant.

(These steps are to be taken with precaution, due to the fact that we do not know the model or manufacturers specifications for your BoB)

Here is a link to our CNC electronic videos(

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I have a CNC Machine from China, and the Breakout Board is not Labeled. Is there any way to test the board using Mach3 to find out the pin designations? db25 bob

Same issue here -- TTL output from the AWC708C never seems to be pulled low. Still troubleshooting.

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MY LASER MACHINE VERTICAL DOES NOT ACTIVATE THE LASER TUBE, VERIFY THE POWER SUPPLIES AND THEY ARE WORKING WHICH THE PROBLEM CAN BE