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### Question #: 14456

Question: Are the stepper motors on x and y axis suppose to be hot after running for approximately 30 min. I can touch them but they are hot.

Current Solution

If your motors are hot to the touch, this is normal. Current is being drawn by the motor coils as the motor moves and as the motor stays at a position. If the motor is not using the current in the coils to move (holding it's position), the energy will be translated as heat (rather than motion, sound or light). Even while moving, some of the energy will be lost as heat. Remember that energy cannot be created nor destroyed.

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### Other Possible Solutions to this Question

• I HAVE FOLLOWED ALL THE "CNC ELECTRONICS 1 - 9" VIDEOS AND I'M USING ALMOST EXACT SAME COMPONENTS (MOTORS RUN SOUND GOOD) BUT MOTORS ARE RUNING VERY HOT IN JUST 15MIN WITH NO LOAD DONE SOMETHING WRONG OR DO STEPPERS HOT?

If your motors are hot to the touch, this is normal. Current is being drawn by the motor coils as the motor moves and as the motor stays at a position. If the motor is not using the current in the coils to move (holding it's position), the energy will be translated as heat (rather than motion, sound or light). Even while moving, some of the energy will be lost as heat. Remember that energy cannot be created nor destroyed.

• I have followed all the "CNC Electronics 1 - 9" videos and I'm using almost the exact same components (motors run and sound good) but the motors are runing very hot in just 15min with no load - have I done something wrong or do steppers run very hot?

If your motors are hot to the touch, this is normal. Current is being drawn by the motor coils as the motor moves and as the motor stays at a position. If the motor is not using the current in the coils to move (holding it's position), the energy will be translated as heat (rather than motion, sound or light). Even while moving, some of the energy will be lost as heat. Remember that energy cannot be created nor destroyed.

• What steppers are required for the X, Y, and Z axis of the scratch build kit? Do they all need to be the same rating?

The required motors are the 425 oz-in stepping motors, would be the required motors to run the machine efficiently.

• I HAVE ONE OF YOUR SMALLER STEPPER MOTORS RUNNING MY X AXIS BRIDGE CRANE AND IF IT IS MOVED TO FAST THE MOTOR SOUNDS LIKE SKIPPING STEPS WILL 651OZ REQUIRE A DIFFERENT POWER SUPPLY CONTROLER?

Yes, the 651 oz/in motor requires a driver that is compatible to the motors (the motor will draw 6 amps max and the driver paired with this motor will be able to allow for a 6 amp draw). I would also recommend a 36 volt power supply for better high velocity performance.

• Lost Comm with steppers: I have been running Mach3 with my Black Toe for years. This morning, I booted up, motors locked up. Started Mach, hit reset, and nothing. Can't move. Checked plugs. Diag screen says OK. What to look for? I have the BYOCNC Computer/contoller box.

New clues. I loaded a different profile I have used for another machine and my Black Toe moves. Of course all the settings are different. I load my normal profile and no ports, pins, or outputs light up.

• I'm going to use 2 stepper motors for my X-axis. Can I use the same connections on the B/O board to do this knowing I will need 2 separate driver boards.

Yes, absolutely. If you need two motors for a single axis, you will want to use the same terminals for pulse and direction from the breakout board.

More specifically, you will wire the step/pulse pin to both drivers, and the direction pin to both drivers. If the motors need to turn in different directions, simply swap the A and B coil connections on one of the motors.

• Your combo kits don't specify whether they are standard NEMA motors. I need Nema 34 with a .375 shaft diameter. Which 3 axis kit work for these requirements?

We currently do not have any Nema motor's with a .375"/3/8" shaft diameter. The motors in stock 100 oz, 425 oz, with a 1/4" input shaft. Our 651 oz, with a 1/2" input shaft.

• I have one of your smaller stepper motors running my X AXIS bridge crane and if it is moved to fast the stepper motor sounds like it is skipping steps will the 651oz stepper motor require a different power supply and controler?

Yes, the 651 oz/in motor requires a driver that is compatible to the motors (the motor will draw 6 amps max and the driver paired with this motor will be able to allow for a 6 amp draw). I would also recommend a 36 volt power supply for better high velocity performance.

• If I wired my stepper motors incorrectly what parts of the electronics will be ruined? When I turn on the power, my motors jump like they are supposed to but for some reason, the G-code doesn't seem to be moving from Mach 3 to the motors. Any help would be appreciated. Do I need to order new electronics or just part of the system? Thanks

The drivers have quite a bit of protection, so you probably won't ruin anything. You motors are jumping and that is just the motors engaging from getting power from the power supply.

There could be many reasons your motors don't turn. Consider these troubleshooting tips:

- If you are using our parallel breakout board, make sure that the step pins are set for active low (config -> Ports and Pins -> Motor Outputs -> the steps pins should be enabled and set active low)

- The parallel breakout board is powered (connect the USB to the computer using a USB cable)

- In Mach3, make sure you have jog enabled (a little green button at thelower middle of the page in the program run screen).

• got my stepper motors wired to the information on your website using USB Bob and the motors don't step they keep turning like an old drill until they stop

So, if I understand correctly, the stepping motor will turn on command, but the motor will only turn in one direction. Check the output of your direction signal wire. Check the wire voltage when you command the motor to turn on one direction in the planet-cnc software. Then check the voltage when you command the motor to turn in the other direction. The voltage should be different in each case.

• Hi I have a Proxxon MF70, I want to add 3axis stepper with controller and software by USB. Can you suggest a kit for me? Thanks.

To implement a electronics combo to run you Proxxon MF70, you will need to find the correct drive components (ACME screw, linear rail, etc) and look into any specific modifications needed to your rig.
I would recommend the USB 3 Axis Large Motors Electronics w/ USB Interface Board.
Since the machine is metal, our larger motors would be highly recommended.

We have not done this conversion, through research is recommended.

• The instructions for the 3-axis combo at https://buildyourcnc.com/item/electronicsAndMotors-3axis-425-elcombo seem to be missing. Can you look into that.

To wire the CNC electronics, use the tutorial for the specific interface board you are using.

If you have the parallel breakout board, use this tutorial:
https://buildyourcnc.com/CNCElectronicsandWiring.aspx

If you have the USB interface board, use this tutorial:
https://buildyourcnc.com/tutorials/tutorial-Electronics-USB-Interface-Wiring

• I bought and built the Blacktooth laser cutter. It works, but one of the stepper motors makes a loud static hiss a second after the CNC power supply is turned on or off, and makes loud tweets and twirps when running. It seems to operate fine otherwise. I was wondering if it was "going bad" or if that is normal?

Stepper motors are known to make noises while function, however this does not affect accuracy or job function. However we recommend to check your wiring for solid connections, and for good connectivity!

On a personal note, here is one cool video dealing with making songs with stepper motors!

• Have checked stepper motor wires dozens of times and they are wired like diagram says. Stepper motors will not turn under power. I am using laser control option. What should I do?

This sounds like a problem with the step (pulse) signal. The driver motors receive two signals from the computer via the board -- one is high or low and tells the motors which direction to turn, one is a square wave pulsed signal(quick that tells the motor to turn or a constant high signal that tells the motor to maintain its position. With an oscilliscope you can check for proper signal at the board. If you bought the board from us, please contact us to arrange a return authorization.

• My mechanical limits work by changing color on computer when tripped but the stepper motors don't stop on X and Y only Z.

Please let us know which board and machine you are using so that we can help you troubleshoot the problem.

• there's a red light active on the inside the corner of my cw230 stepper driver, but there's nothing that says what it's for. is that bad? on the cw8060 driver there's two LED's and the red one says alert. are the red light's on both drivers supposed to mean the same thing?

For the 3.0A driver (CW230), the red led means that it is functioning correctly. It is confusing that they are made this way, but if the red led is lit then everything is fine.

As the 6.0A driver (CW8060) the green led means that it is functioning correctly, and the red led when there is a error.

• I am building a machine and don't know which steppers to use. Machine specs are: plywood frame, SBR25 rails, 96"X48" work area, rack and pinion for X and Y axis (2 motors with 2 racks for X axis), about 3:1 reduction ratio with belt drive. I plan to work on wood, acrylics and aluminum. Thank you!

We would recommend using the heavy gantry electronics combo, using 2 - 425 oz-in motors(NEMA 24) and 1 651 oz-in motor(NEMA 34), with a additional 651 oz-in motor/6.0 amp driver for the x-axis, and that will leave the two NEMA 24 motors for your y/z-axes. The larger motors will be beneficial for the x-axis for the dual motor control and increased torque.

• For tuning the motors in mach 3 should I be running a gcode or is keyboard jogging enough to determine the stall rates

It seems to be getting some kind of interference or a short within the wiring or communication, try jogging the motors in the software without anything wired to the board. Then add one motor at a time to see if there is a short within your wiring or a faulty driver/motor.
If the USB breakout board continues to move the x-axis with no motors or driver wired to it, please email customerservice@buildyourcnc.com for a replacement or further troubleshooting.

• For tuning the motors in mach 3 should I be running a gcode or is keyboard jogging enough to determine the stall rates

Keyboard jogging will give you a good start at motor tuning since going from a stop to rapid travel speed is the quickest the machine will be required to accelerate. However, best practice is to also run test files and actually cut the type of materials you expect to deal with to test machine performance under load and make any fine adjustments needed for maximum performance.