You can change the direction of a stepper motor's rotation by swapping the A and B coils where the stepper motor is connected to the stepper driver. This may not work with every stepper motor and driver combination.

To do this:
- Turn off all power to the stepper drivers. If this is not done, you will damage the stepper driver.
- Wait at least 1 minute for the power to dissipate from the drivers and power supply.
- Once power is off, remove the wires from the A+ and A- and insert these wires into the B+ and B- respectively. Then insert the wires that were in the B+ and B- into the A+ and A- respectively.

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Is there a way to change the direction of a motor with the motor to driver wiring?

For the USB controller and reversing the rotation for a motor, you would need to do this in the software (planet-cnc). In the configuration, you will need to reverse the direction by inverting the direction output.

Technically, the motor changes direction when the direction signal changes from a high to a low, or vice verse. For instance, the motor turns in one direction when the direction signal is, say, low. The motor will turn in the other direction when the direction signal is high. High is 5v and low is 0v or gnd.

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I have wired the step motors with the USB breakout board. When I jog the y axis it travels in the wrong direction. How do i switch the motors rotation?

It is usually best to mount the motor in a way so it is spinning clockwise to avoid confusion.

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ok, but lets say the motors turn clockwise. if you mount it to ether side of the y axis it will pull to that side so what are the correct positions of the stepper motors. is it the left side or the right side of the y axis and also is it the front or back of the x axis?

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cw250 with mach3 controller

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What side of the x and y axis do you mount the stepper motor to? If it does not matter what side, do I have to change something in mach3?

Yes, you can use 2 motors in the same axis output, however you will still need a driver for that stepper motor. Also depending on the orientation on which you mount the motor you might have to invert the direction of the motor, and that will be simple by swapping the A+,A-, to the B+,B- locations and vice versa, from the driver to the motor wiring.

The wiring scheme would look like this:
The step and direction output terminals on the CNC controller interface for the axis you want to have two motors would connect to both drivers of the two stepper motors on that axis.

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I have been running two motors from the same driver for 10 years on my 3m x 1.6m router. Both motors driving the gantry are wired together. I see no reason to use two drivers. The motors are high torque Nema 34. I've had no issues.

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How do I wire two motors on the same axis?

Yes, you can use 2 motors in the same axis output, however you will still need a driver for that stepper motor. Also depending on the orientation on which you mount the motor you might have to invert the direction of the motor, and that will be simple by swapping the A+,A-, to the B+,B- locations and vice versa, from the driver to the motor wiring.

The wiring scheme would look like this:
The step and direction output terminals on the CNC controller interface for the axis you want to have two motors would connect to both drivers of the two stepper motors on that axis.

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I have been running two motors from the same driver for 10 years on my 3m x 1.6m router. Both motors driving the gantry are wired together. I see no reason to use two drivers. The motors are high torque Nema 34. I've had no issues.

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How do I put two motors on the same axis

Do both motors, the main and slave work correctly when using the arrow keys?

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How do you slave an axis with mach3 and pokeys57cnc? My slave axis is only going one direction as a slave and goes correctly in both directions when I direct it with an xbox controller.

The apply a machining operation that cuts along the inside of a polygon, you will need to use the profile machining operation located at the top of the user interface, the first icon in red to the left. Hovering over the icons will inform you of what machining operation the icon represents.

Select the polygon and click on the profile icon. A new profile operation will be created in the left drawing pane (outline of machining operations). Underneath the drawing pane, there is another pane with parameters for the profile listed. Find the Inside/Outside parameter and click just right of that parameter to change the setting to inside.

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How do I cut on the inside of a polygon using CAMBAM?

To change your password, you will need to go to the log-in page (top of screen, left hand side) and enter your username in the password reset section.
You will receive a temporary password via email to log-in and change your password.

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How do I change my password on your site for logging in

We have ran across this issue on occasion, and usually results is there is something along your wiring that is causing a fault or is not getting good contact.
We would recommend going through the wiring thoroughly and checking continuity with the y-axis wires, going from your USB or Parallel BoB to the driver.

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My CNC machine has suddenly started going in only one direction in the Y axis. It was working fine for several days and then started going in a single direction when I would do a manual job.

When trying to use two motors on a single axis, there is a multitude of methods to get them to work together.
First: There should always be a slave option in the CNC control software(mach 3/ planet-cnc/emc2/etc.), this will be the easiest way to make the dual motor configuration work. However some adjusting might be necessary due to the orientation of the motor when mounting it on the opposite side of the CNC machine.(Mach3/config/slaveaxis, planet-cnc/file/settings/axes).

Secondly: Dealing with our interface boards(maybe third-party as well), you can have two drivers going to the same axis on the interface board. Which then will have one motor per driver, this will use the same motion and control from the (ex.) x-axis to driver two motors. However some adjusting might be necessary due to the orientation of the motor when mounting it on the opposite side of the CNC machine.

Adjusting of the driver or motor wires, can be done separate from the control software with the use of a hex inverter, that can be used and to switch the signal (ex. takes a low signal and brings it high, and takes a high signal and brings it low) of one of the motors, to run the same as the other motor.
There is also another method of inverting the orientation of the motors movement without the use of a hex inverter. This method you will have to wire the coil's of the motors oppositely of what is recommended for one of the motors. Example, you will wire our Nema 24 as follows(recommended): A+ - red/blue, A- - yellow/black, B+ - white/brown, B- - green/orange. However to run another motor with with it you will have to switch the A/B connections to: A+ - white/brown, A- - green/orange, B+ - red/blue, B- - yellow/black.

These method's are usually needed/used when trying to control two motors and setting it up without the help of the CNC control software, and also due to the mounting orientation of the second motor, the inverting the direction of motion will be necessary so they work together instead of working against each other.

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From the BOB how can I reverse one of my steppers - i'm running 2 on my Y Axis

You should not have a problem with using this controller and having more than 500 lines of GCode. The 500-lines limitation is specific to licensing. Make sure that the Mach3 that you are using does not show "Demo" at the top of the screen. You can also confirm this in the help->about. If you are using a license that was purchased through this website, or from Machsupport.com, you should be fine.

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[575] Although i have licensed mach, when i use that particular board it seems to run only 500 lines of code, how can i fix that? i

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?

The motor that is attached to the 4th axis is wired as follows:

The motor should have red, green yellow and blue wires coming form the motor. The red and green are paired as one coil and the yellow and blue is paired as the other coil. You can wire the motor to a 3.0 amp driver with red to A+, green to A-, Yellow to B+ and Blue to B-

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HOW DO I WIRE THE 4TH AXIS THAT YOU SELL. I HAVE MACH3 SOFTWARE. NO INSTRUCTIONS ON YOUR SITE

It is not necessary to connect the spindle VFD (Variable Frequency Drive also called an Inverter) to the computer or CNC motion electronics. The VFD can be controlled independently using the control panel on the VFD. The control panel has the ability to control all aspects of the spindle including Speed, Torque, limits, etc. However, you can connect the VFD to the computer so the CNC control program can control the spindle during the CNC Machine operation. You will need to connect the VFD to the computer via a serial conection (in this case, it is the RS-485 protocol).

The following are instructions on how to connect the VFD to Mach3 via this RS-485 serial connection.

The first thing you will need is the dynamic link library to pair with mach3 called the Huanyang VFD Mach3 PlugIn. You can find this file at the mach3 support forum here: http://www.machsupport.com/forum/index.php/topic,14182.0.html

You will also need to download the Microsoft .net 3.5 framework and install it: https://www.microsoft.com/en-us/download/details.aspx?id=21

Follow the pdf that comes with the library file, but here is a synopsis of what you need to do (I also added a lot more information that may be useful during this process as the manual does not cover the main connections that need to be done):

You will need to program your VFD so that it knows how to communicate with mach3 and the computer (go into the programming mode of the VFD and change these parameters):
- PD001 - value 2 - Enables with communication aspect of the VFD
- PD002 - value 2 - Enables frequency control from the communcations port
- PD163 - value 1 - VFD address
- PD164 - value 1 - Baud rate of 9600 (speed of the communication)
- PD165 - value 3 - 8N1 RTU - 8 bits (that's the size of the word that gets communicated), N (No parity or no error checking) and 1 (1 stop bit)

Copy the dll file to the PlugIns folder of mach3.

Connect the RX and TX lines to your computer. There are a couple ways you can do this, but the recommended way would be to use an FTDI USB device which converts a USB to a serial com port. The device will have Rx and Tx connectors to connect to the VFD terminals with the same labels. This method is recommended since serial ports are not as common in computers these days.

Next, you will need to configure mach3 to use the plugin library. Start mach3 and click on Menu -> config ->Config Plugins. Enable the new plugin by clicking on the red cross on the left column next to the plug in. Restart mach3 after doing this.

No you need to configure mach3 to use the HuanyangVFD plugin. Go to the ports & pins configuration and select the spindle setup tab. Make sure that the Disable Spindle Relays checkbox is unchecked. We don't want mach3 to output a signal for a relay since the spindle will start up and turn off within the VFD and not from an external relay.

Next, go to the HuanyangVFD settings by clicking on Menu -> plugin control -> HuanyangVFD. Set the parameters to the same settings you put into the VFD programming. The com port will be shown as new hardward when you plug in the USB FTDI device. A little bubble will be displayed at the bottom right where it will notify you that a new device is being installed (be patient while windows assigns a com port). Alternatively, you can use the windows device manager to see which port was set for the new USB FTDI device). You may need to restart mach3 several times until you get the correct information displayed in the PD001 and PD002 fields. When the com port is correct and the other parameters, like baud and VFD address is the same as you entered in the programming, then the PD001 and PD002 will show the number 2, otherwise, a 99 will appear which means that communication was not successful.

You can now control the on/off and RPM of the spindle using the RS485 communication between mach3 and the VFD.

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The question was how to connect the spindle to the redfy. I did not receive a VFD.
I have the redFly system and a 2.2kW Spindle - 110V how do i connect the spindle?

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If you received a spindle without a VFD, please contact us asap. Our spindle will not work without a VFD.

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Hi, how is this setup in mach4?

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How do I conect the VFD of the spindle to the RS485 connections

If you are needing a status of an order that you purchased from us, you can either log-in and click on the "My Account" link at the top, or call us at 281-815-7701.

The "My Account" link will contain all of the orders and tracking numbers associated with those orders. If the order does not contain a tracking number, call us to get a status of the order. In most cases, we will call you first if there is a backorder in our inventory.

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how do I get the status of my order?

If you remove the dust shoe, you should be able to reach the collet to remove the end mill.

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DO HAVE TO REMOVE THE PORTER CABLE 892 ROUTER EVERY TIME CHANGE BIT?

The instructions on how to do this are found here, in these two videos, http://buildyourcnc.com/PrimeronHomingandLimitSwitches.aspx

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HOW DO I CONNECT A TOUCH PLATE TO THE BREAKOUT BOARD?

There are two main questions that we can answer with respect to motor torque and the mechanical advantage of lead screws, 1) What torque motor do you need to lift a particular weight, or 2) What maximum weight will my motor torque be able to lift.

This formula uses Newtons (N) as it's final unit. Use this with the included radius (R) to determine the torque. Newtons can easily be converted to lbs or ounces using online conversions.

Effort = Sf + (Load/(2 x pi x (R/p) x Se))

where:
p = pitch of the screw
Se = screw efficiency = Standard lead screw will be between 20% (.2) and 40% (.4)
Sf = static force. This is the force that is needed to start the movement. The number may be eliminated, but it is good to use a number in the 5 N to 20 N range.
Load = the expected load that the effort will need to carry (i.e., the router and the included axis assembly that the motor will need to lift)
R = radius of the lead screw


This formula is based on the "law of the machine"

The final effort amount with its unit of newtons and R will be the torque. For example, if the effort comes to 100 N (newtons) and the R is .5 inches, then you can assume that the effort is 50 N-in since it would take twice the effort to turn form the one inch mark from the center of the shaft.

Example:

Load = 90 N (20.2 lbs)
R = 1 inch since that is the length from the center of the shaft that the motor is rated
p = 1 inch / 13 = .08 inches

Effort = 5 N + (90 N / (2 x 3.14 x (1 / .08) x .2))
Effort = 5 N + (90 N / (6.28 x 12.5 x .2))
Effort = 5 N + (90 N / (15.7))
Effort = 5 N + (5.73 N)
Effort = 10.7 N = 2.4 lbs = 38.4 oz-in

I am putting the oz-in on the end because the formula considers the distance from the center of the shaft to be one inch.

Therefore, a 425 oz-in motor would be able to lift a 20.2 lb Router with its accompanying assembly. If the assembly and router is heavier, plug in the numbers and determine the effort required.

With a bit of algebra, the formula can be rewritten to find the load:

Load = (Effort - Sf) x (2 x pi x (R/p) x Se)

Another formula that does not consider friction at all:

Effort = (Load x p) / (2 x pi x R)

Lets see if we get similar results:

Effort = (20 lb x .08 inches) / (2 x 3.14 x 1)
Effort = 1.6 / 6.28 = .255 lbs = 4.08 oz-in

The results from both formulas appear to be very small because a 13 TPI screw will have enormous mechanical advantage.

It is evident that the first formula that does consider friction that we are loosely estimating is far more conservative than the second formula. Either way, even the most conservative formula shows that the 425 oz-in motor will handle very large weights. If you are using a lead screw with only two turns per inch, .5 inch pitch, you can determine the requirements with the first formula.

Example for a 10 TPI 5 start (2 turns per inch) lead screw:

Load = 90 N (20.2 lbs)
R = 1 inch since that is the length from the center of the shaft that the motor is rated
p = 1 inch / 2 = .5 inches

Effort = 5 N + (90 N / (2 x 3.14 x (1 / .5) x .2))
Effort = 5 N + (90 N / (6.28 x 2 x .2))
Effort = 5 N + (90 N / (2.512))
Effort = 5 N + (35.83 N)
Effort = 40.828 N = 9.18 lbs = 146.88 oz-in

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thank you so much

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how do i calculate torque of stepper motor if lead screw coupled to motor shaft and load applied by lead screw on plate is 100 kg by vertically

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Pls


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1m 16mmdiameter ball screws calculations


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What is the max load that 2 NEMA 17 stepper motors (spaced 2 feet apart, both will be pushing up on the same gantry) can lift while using a rod with the following specifications T8 OD 8mm Pitch 2mm Lead 4mm for each motor.

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HOW DO I DETERMINE THE AMOUNT OF SCREW WEIGTH THAT MY MOTOR CAN HANDLE

These machines are inherently dangerous. Before the machine moves, the machine should be clear of any person by a dimension of at the distance of a persons reach plus a few more feet. This is the policies we institute in our shop and what is recommend to all of our customers. Treat these machines as you would treat any major power tool in the shop.

With that said, you can certainly add some protective parts, but still keep folks away even with those installed. I would use the gantry side to do all of the mounting of the protective parts. Consider using sheet metal that you can bend and make a simple installation right on the gantry side.

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HOW DO ADDRESS THE DANGER OF THESE CNC MACHINES