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### Question #: 13313

Question: i am hobyist in desining pcb but i need help for creating footprints from scratch...........but i dont know if i can ask here this question becauser i notice this site is cnc for only.......

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We do not provide PCB design assistance on this website.

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• hello there, i am using servo motor for my X and Y Axis but i dont know how to calculate steps/mm for that, the lead screw i am using is have pitch of .5 mm. please helpme on this i have done everything only this point is pending.

The formula for finding the steps per mm is found in the units itself. First, you mentioned that the motor is a servo. This needs to be clarified as a servo is different than a stepper motor. Some servos behave similar to a stepper motor, so I will continue with this in mind.

The formula is (steps/mm):

You need to find the steps. The stepper motor has a natural number of steps per a full revolution. This is typically 200 steps per revolution.

The driver for the stepper motor allows you to increase the number of steps per revolution by adding a specified number of steps between each step. For instance, if you set the driver to 1/4 microstepping, then instead of having 200 steps per revolution, you would have 200 x 4 = 800 steps per revolution.

So now we have the first part of the formula:

Steps / mm = (200 x 4) / mm

Lets determine the mm side of the formula:

You mention that the pitch is 0.5 mm. Check to insure that the lead is also 0.5 mm. This could be a multiple start lead screw where the pitch is different than the turns per mm. If in this case, that the 0.5 mm is the travel for one full revolution, then you can simply plug this into the formula as:

mm = .5 mm

Otherwise, determine how fat the travel is for one complete revolution.

Therefor, with what we know and the driver is set at 1/4 microstepping and the stepper motor has a natural step count per revolution at 200:

steps / mm = (200 steps x 4) / 0.5 mm = 800 steps / 0.5 mm = 1600 steps / mm

If your travel for one revolution is not 0.5 mm, then plug in your travel distance instead.

i know about steps/mm calculation for stepper motor, because i am using servo motor that why i asked about that. please tell for servo motor.

because its my first time with servo motor i have no idea about calculation of parameter with servo.

Have you attempted to contact the manufacturer or seller of the servo? We typically respond to customers of our products on this customer service area, unless we have extensive knowledge of the subject and can answer the question efficiently.

• I am making my own CNC setup using all the electronics from your website and I have many questions. Please advise how to have my computer recognize the USB connection from my breakout board also I would like to use a water cooled spindle but I need to know the parts required for a 4x10 bed area used for woods and plastics

You will need PlanetCNC software for the USB breakout board and when plugging in the USB the computer should automatically recognize the board, however you can go into device manager to see if the USB terminal is working correctly.
The parallel breakout board; the USB is not a connection terminal rather than a power source, and the parallel port will be the communication terminal.
The items you will need for a water cooled spindle would be: water pump, silicon tubing(length desired by customer), a extension cord(from a hardware store(orange))(1 same gauge wire/length as extension cord).

• First time here. I would like to know if you guys sell a 8 start nut thats a 1/2 inch diameter. I hope this makes sense, any questions let me know. Thanx

Yes, our porter cable collets and nuts will fit the porter cable 7518.

• I need to know if you have prices for educators, or other ways that a teacher could procure a blackToe 2'x4' CNC router. I apologize that this is sort of a bold question, as your routers are already well-priced.

• This question has been asked before: What happened to my Mach3 Motor Tune-up in the Configure tab, it has disappeared but had been there before. The previous answers were to go to config: motor tuning

The Mach3 USB interface board requires 24V relays externally. There are no relays on the mach3 usb board. If you use an external relay on the mach3 usb board, the relay connects to the V+ which is 24V and the output pin is the return.

I understand what you are saying. Does your relay board work with the Mach3 USB board? If not, what relay board do you suggest to work with this usb controller?

Our relay board works with our parallel breakout board. An off the shelf SSR (Solid State Relay) made for 24V should work fine.

• This question has been asked before: What happened to my Mach3 Motor Tune-up in the Configure tab, it has disappeared but had been there before. The previous answers were to go to config: motor tuning

Motor tuning is the third option down when you click the config menu option. I have never used the motor tuning dialog from anywhere else. If you are looking for the button to calibrate the axes, then go to the settings tab and click on the button that says "Set Steps per Unit".

• I am interested in buying the greenBull 5X Long Z CNC Machine Kit, but it is not clear for me what is included in this kit. Is there anything else I need to get the machine work?

The greenBull 4X comes with all of the components and electronics to assemble the gantry of the machine. You will need to build the table. We provide the rails and roller chain for the X-axis (along the length of the table for full 8 feet of travel). You will need to provide some wire to connect the electronics and a computer to run the machine. You will also need to purchase the software that you will need to run the machine that matches how you will apply the machine. We suggest the mach3 control program. The CAM program is up to you as there are many options out there.

• I have wired up my 110v VFD and my 2.2Kw spindle and I get an E.Lu.5 code. My wiring is correct and the parameters are set to those for the VFD according to your website I found in a previously answered question from someone here. Any help would be greatly appreciated, thank you!!

The E.Lu.5 Error code on your VFD is related to Low Voltage.

The recommended action is:
- 1. Check whether the input voltage is normal. (the voltage from the wall/breaker to the VFD)
- 2. Check whether there is a sudden change in load.
- 3. Check whether there is any phase missing.

Unfortunately, these three recommended actions will probable require an electrician to test the line going into the VFD.

• I purchased Mach3 from buildyourcnc dont know what verson i need to use in VCarve as the processor. There are 8 2/3Mach listed

You will probably have post processors like the following listed:
Mach2/3 ATC Arcs (inch)
Mach2/3 ATC Arcs (mm)
Mach2/3 Arcs (inch)
Mach2/3 Arcs (mm)
Mach2/3-WrapX2A ATC Arcs (inch)
Mach2/3-WrapX2A ATC Arcs (mm)
Mach2/3-WrapY2A ATC Arcs (inch)
Mach2/3-WrapY2A ATC Arcs (mm)

If you have an Automatic Tool Changer, use the post processor with the ATC in the name. For most applications and if you don't have an ATC (automatic tool changer), use the Mach2/3 Arcs (inch) or (mm) post processor.

• my motor only steps in single increments when i click the jog button on the planet cnc software, it doesn't continue stepping as I am holding down the jog button, can anyone help me with this?

There is a drop menu next to JOG on the main page. Will be the arrow pointing down next to the the JOG box, disable the step option which is the very first option.

• I am interested in the 3 axis combo USB option. I notice you endorse the Planet-CNC for use with this but will Mach3 interface well with the USB beak out Board?
• I AM INTERESTED IN THE 3 AXIS COMBO USB OPTION. NOTICE YOU ENDORSE PLANET-CNC FOR USE WITH THIS BUT WILL MACH3 INTERFACE WELL BEAK OUT BOARD?
• Hi, I am thinking of making a CNC router that I can use in woodworking. I am very happy if you can help me with the necessary parts for this

Ok, sure. Let's get the discussion started. Please respond with your questions on this FAQ

• 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.

• What do I need to purchase from you to get me running. I have planet cnc control board but it is difficult contacting them when I need help.

Software specific questions for Planet-CNC will have to come from them or other sources as we are not fully equipped to troubleshoot all issues. If the issue is related to motor tuning or setup involving our electronics, then we will gladly assist you. You may contact techsupport@buildyourcnc.com with inquiries.

• sorry, this is what i meant to say: OK, so if I use the USB version then I would find the rotary/linear axis definitions in the planet cnc control software somewhere. I will be needing to change axis type often for various projects that is why I am asking.

You can download a trial version of PlanetCNC software from their site at http://www.planet-cnc.com/index.php?page=software to see how you like the interface. If you look at their main GUI screen, along the left side you will see 4 boxes labeled X,Y,Z and A. These represent the axes the software is equipped to control. (A being Axial, or rotational motion) Typically a separate motor and driver is used to control each axis. If you plan to switch axes you will need to connect and disconnect the outputs from your software to the drivers.

• I purchased a vfd and spindle from a friend, his set up is 220. I don't have 220 in my shop. My question is can I use your 110 vfd with this spindle??

Depending if the spindle can work with this specific VFD, it might be possible. However we would not like to risk you working unit, with a possible match so we would like more details on your specific model and any information available on the spindle itself.

Response
The only info on the spindle is 2.2KW 400HZ 220V. Made by Zhong Hua Jiang.

Was originally on a Delta C200 vfd. That is 220 single phase.

• I am building a cnc router with twin ball screws on the long axis and I will have a rotary axis as well. I need a 5 axis breaker board using only 4 axis total. Can you help me?

Yes, we can make a redLeaf system that has all 6A drivers for use with the 651 oz-in motors. We can also wire the electronics in a way that two of the drivers will use the pins of the same axis so that axis will drive two drivers and motors.

• I NEED HELP IN GATHERING PUBLISHED INFORMATION ABOUT THE RISKS POSED BY CELL TOWERS PLACED ON SCHOOL GROUNDS. THERE WHICH WOULD ENABLE ME TO GATHER/CALCULATE OR MEASURE RADIATION SPECIFIC SITE?

The best single reference is the Federal Communications Commission (FCC) Website. Look for:

Bulletin 65, "Evaluating Compliance With FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields,"

"A Local Government Official's Guide to Transmitting Antenna RF Emission Safety: Rules, Procedures, and Practical Guidance."
An excellent technical paper with field measurements of cell-tower emissions was published by R.C. Petersen and P.A. Testagrossa in the journal Bioelectromagnetics, volume 13, page 527ff, 1992. If you need onsite technical support and services there are various consultants available, such as Richard Tell Associates, Inc. Gary Zeman, ScD, CHP Lawrence Berkeley National Laboratory

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