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### Question #: 15433

Question: [Mach3 USB Interface Board] How many Amps can the output handle? My SGR pulls 2.6 Amps so I need to know if the output can handle that much.

Current Solution

The Mach3 USB Interface Board is designed to handle an output current of 50mA. These outputs are generally not suitable for heavy loads like Spindle Governor Relays (SGRs)​​. Given that your SGR pulls 2.6 Amps, it exceeds the capacity of the Mach3 USB Interface Board's output. Therefore, directly switching the SGR using the Mach3 USB Interface Board is not advisable. Instead, using your existing C36 rev1.1 board as an intermediary would be the recommended approach. This board can handle higher currents and will act as a buffer, protecting the Mach3 USB Interface Board from being overwhelmed by the higher current demand of your SGR.

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### Other Possible Solutions to this Question

• [575] How much current can the outputs handle? I want to know if I can directly switch my SGR or if I have to go through the existing C36 rev1.1 board first.

The output current for the Mach3 USB Interface Board is 50mA. These outputs are generally not designed to handle heavy loads like Spindle Governor Relays (SGRs).

If your SGR requires a hefty current. Attempting to directly switch it using just the Mach3 USB Interface Board would not be a good idea. In that case, using your existing C36 rev1.1 board as an intermediary is the way to go. That board can handle higher currents and will act as a buffer, ensuring that the Mach3 USB Interface Board doesn't get overwhelmed.

[575] How much current can the outputs handle? I want to know if I can directly switch my SGR or if I have to go through the existing C36 rev1.1 board first.

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

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)

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

Customer Response:
thank you so much

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

Pls

1m 16mmdiameter ball screws calculations

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.

1

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

• I'm using Vectric's Aspire for design on my ShopBot. Do you know which output format I need to generate for the LeanGreen?

a motor stop working and get very hot

I'm using Vectric's Aspire for design on my ShopBot. Do you know which output format I need to generate for the LeanGreen?

• I received the electronics for book build cnc machine. I need to know how much weight the z-axis motor can hold since my (craftsman) router seems to be heavy. It is 2HP with variable speed

The motor is helped by the mechanical leverage of the screw. The 425 oz-in motors that are included in the standard electronics combo has very high torque for that type of machine. You will have no problem using that motor for the book machine.

We use that motor for very heavy spindles on the blackToe and blackFoot CNC Machine kits.

You will need to do the mechanical leverage calculation along with the torque of the motor to determine the actual weight it will lift. The calculation will need to consider the type and pitch of the screw and it would also consider the gravity constant of 9.8 m/s/s.

If you need me to determine this formula and work out the calculation based on the screw you are using, please let me know.

thank you for the reply. I would be really good to know the calculation. The lead screw is 1/2" diameter with 13 TPI. Please provide the calculation. And one more question. If I am cutting 18mm MDF with 6mm cutting bit (so 6mm pass), what can be the maximum speed rate of cutting and spindle speed of router?
thank you

I received the electronics for book build cnc machine. I need to know how much weight the z-axis motor can hold since my (craftsman) router seems to be heavy. It is 2HP with variable speed

• I need to replace the fried electronics box for my 6090 wood router. Do you offer a play and play, no wiring required, kit? If yes, how much? If no, can you recommend one?

Yes, we offer a CNC electronics assembled package called the redFly, redLead and redSprout. If you already have a computer, I would recommend the redFly. You would still need to add connectors to the ends of your motor cable.

https://www.buildyourcnc.com/item/cnc-computer-system-redFly

I need to replace the fried electronics box for my 6090 wood router. Do you offer a play and play, no wiring required, kit? If yes, how much? If no, can you recommend one?

• I have 8 wires wired to my driver in the right places. I need to know how to wire the relay Ken

There is no need to connect a stepper motor to a relay. The stepper motor driver controls the stepper motor completely.

I have 8 wires wired to my driver in the right places. I need to know how to wire the relay Ken

• [575] How is the bit-resolution on the PWM output for the spindle control? (8-bit or higher?)

I am not sure of the resolution for the PWM output for spindle speed control. However, if you are worried about getting the exact speed you need, 8-bit will provide 256 levels of increments. This translates roughly to a change of 94 RPM from one increment to another. Remember to provide some inductance and shielding to the signal lines so you won't get fluctuations in speed.

[575] How is the bit-resolution on the PWM output for the spindle control? (8-bit or higher?)

• LIMIT SWITCHES FOR AXIS. THE PRINT SHOWS THAT YOU CAN WIRE LIMITS EITHER N.O. OR N.C. SO IF THIS IS CORRECT I WOULD NEED TO TELL BOARD IN SOFTWARE HOW LOOK AT THESE LIMITS, I'M GOING GET AN INPUT LOOSE DEPEND ON IT.

BYCNC Response:
This is correct. You will need to use a method appropriate for the software you are using. Also remember that NC switches are typically wired in series, while NO switches are normally wired in parallel.

User Response:
I am using the cnc planet software for your USB board. Are the limit configurations in this software?

BYCNC Response:
Yes, Planet CNC software is compatible with the use of limit switches. Configuration information will depend on your specific application. You can view Planet CNC's information here: http://www.planet-cnc.com/files/CNCUSBController.pdf

• I ordered 96 inches of the 1/2 inch 10 tpi drive screw. I need it in 3 pieces. 53 inches, 30 inches, and 13 inches. Please let me know if that can happen. Thankyou

Yes. We will make sure the lead screw is cut to those dimensions. 53/30/13

I ordered 96 inches of the 1/2 inch 10 tpi drive screw. I need it in 3 pieces. 53 inches, 30 inches, and 13 inches. Please let me know if that can happen. Thankyou

• [575] how do i connect a lathe spindle speed encoder to this usb breakout board controller so i can set up for thread cutting on my lathe and on the mill for threading

This controller does not have an encoder input to determine the speed of a lathe spindle. The Pokeys57CNC does have an available encoder input.
https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach4-mach3-USB-ethernet-Board

[575] how do i connect a lathe spindle speed encoder to this usb breakout board controller so i can set up for thread cutting on my lathe and on the mill for threading

• I bought an used machine that need work how can I find the model. The owner said, he used this site for parts and manual.

If you purchased a machine that was used and you don't know which mode it is, you can browse our models here:
https://www.buildyourcnc.com/Item/milling

I bought an used machine that need work how can I find the model. The owner said, he used this site for parts and manual.

• I have your breakout board with relay parallel port , how can I wire up a regular router to that board so I can control the router

Here is how to connect your router to the parallel breakout board through the on-board relay. You will need a spare extension cord. You will need to remove a portion of the outer jacket of the extension cord to expose the white, black and green wires (white = neutral, black = live and green = ground), understanding that the neutral and live create the completed circuit.

See this image of a similar connection. The terminal has the same connections.
https://www.buildyourcnc.com/images/vacuum-pressure-controller-relay-terminals-700.JPG

Image of the relay terminal:
https://www.buildyourcnc.com/images/breakoutboardrelayNONC.PNG

The live/black wire would be cut and one end of the cut would be secured into the P terminal and the other cut end would be secured into the S terminal. The live and ground wire would be uncut and travel from the plug to the router.

You can also connect other high powered devices to the breakout board using any of the output terminals. You will need to supply extra relays like the one shown here:
https://www.buildyourcnc.com/item/electronicsAndMotors-breakout-Relays-relay-board-250V-12A-5V

Or you can find SSRs (Solid State Relays) that will accept 5v to drive the relay coil. Make sure the SSR will protect the 5V line from Back EMF as there is a coil in the relay. The one we sell contains a fly-back diode to protect the 5v terminal.

I have your breakout board with relay parallel port , how can I wire up a regular router to that board so I can control the router

• [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

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.

i have a licence but mach 3 not work above the 500 lines

[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

• I have purchased cable carrier chain and would like to know if you could send me a copy of that order as I need to purchase extra lengths of the links I bought. Thanks

If you were logged in when you made the purchase, you can click the "My Account" link at the top of any page on this website and see all of your orders, order line items (with direct links to these items), and shipment information.

Here is a link to the "My Account" page for your convenience:
https://www.buildyourcnc.com/CustomerInfo.aspx

I did not see your username on your internal customer record, so I added this username and you should be able to see the information in the "My Account" page.

I just tested your accounts page and the cable carrier links are in there. Thanks and please let me know if you need further assistance.

I have purchased cable carrier chain and would like to know if you could send me a copy of that order as I need to purchase extra lengths of the links I bought. Thanks

• HOW MUCH SILICONE TUBE DO I NEED FOR A GREEN LEAN TO CONNECT THE SPINDLE

The greenlean requires 56 feet of 1/4 Inside Diameter and 3/8 Outside Diameter silicon tube for the spindle.

20

20

HOW MUCH SILICONE TUBE DO I NEED FOR A GREEN LEAN TO CONNECT THE SPINDLE

• when using mach3 how can I start the plasma using output signal at output 1?

Which controller would you like to learn how to control a plasma cutter?

Bsmced4u-pp bitsensor.com

Bsmced4u-pp bitsensor.com

when using mach3 how can I start the plasma using output signal at output 1?

• when using mach3 how can I start the plasma using output signal at output 1?

Which controller would you like to learn how to control a plasma cutter?

Bsmced4u-pp bitsensor.com

Bsmced4u-pp bitsensor.com

when using mach3 how can I start the plasma using output signal at output 1?

• I would like to know what the lowest rpm that can be acheived with the 2.2kw spindle and inverter and still have enough torque to drill

According to the supplier of the 2.2 kW spindle, the safest operating speed for the spindle is 6000 RPM. The supplier also stated that theoretically, the spindle can operate from 0 to 24,000 RPM. I am continuing a dialog with the supplier to delve deeper into understanding the configurations and ramifications of such configurations for operations outside of the safe boundaries into the "theoretical" ranges.

20

I would like to know what the lowest rpm that can be acheived with the 2.2kw spindle and inverter and still have enough torque to drill

• Do you have the data sheets for the motors so that I can use the dimensions in my model?

You can find the datasheets to our motors be going to the the stepping motor category page https://www.buildyourcnc.com/category/nema and selecting the motor. This will bring you to the product page for the motor and all of the motor information will be found there.

Do you have the data sheets for the motors so that I can use the dimensions in my model?

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