We will provide shim washers as a part of machine assemblies, but when purchasing lead screw and bearings, the shim washers must be purchased as well. Please give us a call and we can send them out.

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I just ordered a 1/2" lead screw and bearings, etc. But I don't see any 1/2" shim washers for those bearings. If you have any, please toss 8 of them in the shipment and I'll gladly reimburse you.

The maximum length we can ship is a total of 78" inches. However we can send your required length in portions. Please refer to adding the total items you require to your cart to get a visualized amount and shipping cost.

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Regarding 1/2" 5 start and 10 TPI ACME precision lead screw, what the maximum length you can ship within USA? I'm looking for something like 100" and I could use a 1" screw if available. Please include estimated price. Thanks.

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.



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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.

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

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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.

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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.

You would use a combination of bearings and collars to prevent your lead screw or rod from being able to move back and forth. Without it being able to move back and forth, you shouldn't have the couplings coming apart, because the motor is solidly mounted and unable to move as well.

I will try to draw a picture using symbols, with a key to define what each part is.

--CB|--------------|BC}{M

- = Lead Screw or Rod
C = Collar
B = Bearing
| = Wood, the frame of your machine
}{ = Coupling
M = Motor

On the example above you could replace the collar on the motor side with one half of the coupling, putting it right upside of the bearing to hold it in place instead. Like this:

--CB|--------------|B}{M

You could also place the bearings on the inside as follows:

----|BC----------CB|--}{M

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can you please specify how to connect the collar/nut and bearings to prevent the axial movement of lead screw. Do I have to put that next to the stepper motor /coupling assembling or on the other side where the lead screw comes out. Or is there any way I can make the flexible coupling rigid so it does not come out of the middle spider?

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

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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, if you need a replacement part on your machine please call us at 281-815-7701.

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I have a blacktooth laser engraver. The Y Axis stepper motor needs to be replaced. Can you please provide me with the information I would need to replace this motor.

We do have a relay board that words like a standard relay.

Here is the URL of the relay board that we offer:

https://www.buildyourcnc.com/item/electronicsAndMotors-breakout-Relays-relay-board-250V-12A-5V

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I HAVE YOUR MACH3 USB BOB, DO YOU GUYS SELL A TORCH CONTROL RELAY CAN WIRE UP TO TURN MY PLASMA ON AND OFF HOW WOULD WIFE THAT TOO THIS BOB?

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.

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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.

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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

We can special order this part for you. Give us a call and we will either find the part for you, or find a part that we can machine to your specifications.

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HI, I am looking for a drive sproket for a roller chain. The drive sproket should have an ID= 16mm. do you have something like this in your inventory?

As shown in the instructions the laser tube that was used was a different model which had the metal end, compared to our full glass tube models we currently ship with the machines.
So there is no difference besides appearance between the two tubes.
The focus lens should be placed in the laser nozzle assembly and not on the laser tube itself.


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I bought a blacktooth laser from you about a year ago.. I am finally getting around to installing the laser tube and I noticed that my tube does't have the metal end on it like all the pictures I've seen. is this a focus lense and can I purchase one?

This will depend on the VFD you have to identify the correct terminal. The terminal on the VFD will be labeled AI1 typically (Analog Input #1). You will also need to make sure to complete the PWM circuit using the GND terminal on the VFD.

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I have wired my 0-10V signal to the AI1 and GND terminals as suggested. I have also set the PD-01 and PD-02 settings to 1. Still nothing. Is there something else that I am missing?

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Thanks for the information. Can you let me know the model of the VFD that you have?

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VFD Model # YL600-2S-2K20

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Thanks. I will check our resources and documentation to see if there is another programming setting that needs to be changed.

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Does your VFD have a VI terminal?

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No, it does not. The terminals for this VFD are as follows (seperated by dashes "-").

10V-AI1-AO2-PLC-DI5-DI3-DI1-COM
AI2-GND-AO1-DI6-DI4-DI2-FM-24V

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Do you have a PD070 parameter?

PD070 is the main Analog Input parameter.

The options for that parameter is:
0: 0-10V
1: 0-5V
2: 0-20mA
3: 4-20mA
4: 0-10V (4-20mA Stacked)
5: XIA
6: (VI+XIA)/2
7: (3VA+XIA)/4
8: (XIA_XIB)/2
9: Max (XIA, XIB)
10: Min (XIA, XIB)


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There is a PD-00 thru PD-09. PD-07 is currently set to 0.

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It appears that the manual I’m using “Titled YL600” is not the same as your unit. I will check our manuals and find the one that has only PD-00 to PD-09.

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For that VFD, the parameters are P0. The 0 may look like a D on the display.

The parameters that need to be changed for the AI1 to work (Brackets [] around the correct selection):

P0-01: First Motor Control Mode
- 0: Sensorless Vector Control
- 1: Flux Vector Control (FVC)
- [2]: V/F Control

P0-02: Options of Command Source
- 0: Operation Panel Command Channel (LED will be off)
- [1]: Terminal Command Channel (LED will be on)
- 2: Communication Command Channel (LED will flicker)

P0-03: Options of Principle Frequency Source X
- 0: Digital Setting (Preset Frequency P0-08, UP/DOWN modifiable, no power-down memory)
- 1: Digital Setting (Preset Frequency P0-08, UP/DOWN modifiable, with power-down memory)
- [2]: AI1
- 3: AI2
- 4: AI3
- 5: Pulse Setting (DI5)
- 6: Multi Speed Instruction
- 7: Simple PLC
- 8: PID (Proportional Integral Derivative Control)
- 9: Communication Given

P0-11: Upper Limit Frequency Source
- 0: P0-12 (Make sure the P0-12 parameter has the correct max frequency if used)
- [1]: AI1
- 2: AI2
- 3: AI3
- 4: Pulse Setting
- 5: Communication Given

P0-27: Command Source Bundle with Frequency Sources
Single Digit: Options of Operation Panel Command Bundle with Frequency Sources
- 0: No Bundling
- 1: Digital Setting Frequency
- [2]: AI1
- 3: AI2
- 4: AI3
- 5: Pulse Setting (DI5)
- 6: Multi Speed Instruction
- 7: Simple PLC
- 8: PID
- 9: Communication Given
Double Digit: Options of Terminal Command Bundle with Frequency Sources
Hundred Place: Options of Communication Command Bundle with Frequency Sources
Kilobit: Options of Automatic Operation Bundle with Frequency Sources

P2-09: Upper Limit Source of Lower Torque Under Speed Control Mode
- 0: Function Code P2-10 Setting
- [1]: AI1
- 2: AI2
- 3: AI3
- 4: Pulse Setting
- 5: Communication Given
- 6: MIN (Al1, Al2)
- 7: MAX (Al1, Al2)
- Maximum range for options 1-7, accords with P2-10

If you elect to use a different AI#, then configure the parameters (P0-03, P0-11, P0-27 and P2-09) accordingly.

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I'VE BUFFERED A PWM SIGNAL TO 0-10V ANALOG AND I WOULD LIKE USE THAT RUN YOUR 110V 2.2KW SPINDLE VFD. COULD YOU PLEASE DETAIL THE CORRECT WIRING VFD SETTINGS GET WORKING?

We do have a relay board that words like a standard relay.

Here is the URL of the relay board that we offer:

https://www.buildyourcnc.com/item/electronicsAndMotors-breakout-Relays-relay-board-250V-12A-5V

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I have your mach3 USB BoB, do you guys sell a torch control relay I can wire up to turn my plasma torch on and off and how I would wife that too this BoB?

To determine the status of your order, simply log in and click on the "[My Account]" link at the top of the page. If you purchased as a guest, you will need to call the office to determine the status and get the tracking number for your order.

The office phone number can be found by clicking "Need Help?" is located at the top right of all buildyourcnc.com web pages.

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I placed an order for a 4th axis with tailstock on Wednesday and was just wanting to check on the shipment status. I'm needing the item early next week and need to confirm that it will arrive in time. Thank you.

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.

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I would like to design my own CNC router around one of your electronics bundles, either the 3 Axis - Heavy Gantry or 3 Axis - All Large Motors. Do you have the data sheets for the motors so that I can use the dimensions in my model?

Could you specify which breakout board you have? If you have a parallel port version, be sure that you have purchased the "legacy" parallel port version from Mach4. If this proves not to be the problem, please feel free to email us directly at techsuport@buildyourcnc.com or call 281-815-7701 for troubleshooting instructions.

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I need a resource, we bought 2 redfly systems and mach 4, We put one motor on for the x axis but cannot get it move. Can you direct us to some tutorial?

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

Customer Response:
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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I need the calculation to determine the stepper motor torque to find the load that it can withstand in horizontal position using a lead screw at 1/2" diameter with 13 TPI.

What problems are you having?

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I purchased a 4ft X 8ft Blackfoot CNC machine in 2015 and to this date have not been able to use it. How can I get some help. Thank u

CamBam specifically creates the g-code (machining operations) instructions to be loaded into Mach3. Make sure in your CamBam g-code file parameters, you are using the Mach3 post processor. If you have already done this, let me know. If you are not sure how to do this, let me know.

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I am having trouble connecting the cambam program with my Mach3 to my 4X8 Blackfoot CNC machine. Where can I get help on this issue. Have had my machine since 2015 and have not been able to use it. Thank you

Polabs prepared step by step user guide for PoKeys57CNC and Mach4 to try answering such questions. It is available in our downloads section: https://www.poscope.com/wp-content/uploads/downloads/Pokeys/LibrariesAndPlugins/Mach4 and PoKeys57CNC - step by step guide.pdf

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I need your assistance... I have two items left to setup on my Pokey57CNC and Mach4, Home switches and Spindle Speed. I have watched the videos, but they are for Mach3 and the screens are different in Mach4. Can someone please explain the setup of these two items in Mach4?