[ Register ]

### Question #: 13321

Question: That happens when ni and ni x move and the motor x makes noise

Current Solution

What noise is the motor making? And what is ni x move?

Respond:

### Other Possible Solutions to this Question

• The slaved axis moves slower that the other motor on the same axis

If you have a slaved motor, you need to make sure that the two driver's dip switches are set the same so they both use the same microstepping.  You also want to make sure that one of them is not losing steps by setting the motor tuning in such a way that the motor torque has a sufficient buffer.

Click the link to respond:
The slaved axis moves slower that the other motor on the same axis

• 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)
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

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

Click the link to respond:
HOW DO I DETERMINE THE AMOUNT OF SCREW WEIGTH THAT MY MOTOR CAN HANDLE

• 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.

• My X axis motor runs normally at a jog rate or 2-10% , but makes a loud noise at any higher jog rate

A couple of things you can try to reduce the noise of a motor.

First, change the amp setting on the driver to a lower value. This will make the initial thump lighter, and cause the motor to run quieter, but the torque may not be as high as desired.

Second, increase the micro stepping to a higher value, like 1/16 (3200) instead of 1/8 (1600), for instance.

Click the link to respond:
My X axis motor runs normally at a jog rate or 2-10% , but makes a loud noise at any higher jog rate

• I received the 425 oz-in motor from you. Is it supposed to rotate freely by hand when not powered?

It may be tough to rotate a stepping motor by hand prior to energizing it especially if it is a large motor above 400 oz-in.

Click the link to respond:
I received the 425 oz-in motor from you. Is it supposed to rotate freely by hand when not powered?

• 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

• MOTOR GOING TWO DIRECTION WHEN JUST PUSH UP. IT WILL GO DOWN AND THEN GOES AGAIN UP WITH THE SAME BUTTON.

Try slowing your feedrate down and increasing spindle RPMs. End-mills will leave a poor finish if you go too fast. Make sure your cutting depth isn't too much. Maybe the endmill or cutter is blunt? Could it be the feed direction of the cutter? Some materials need to be fed in a certain direction.

• MOTOR GOING TWO DIRECTION WHEN JUST PUSH UP. IT WILL GO DOWN AND THEN GOES AGAIN UP WITH THE SAME BUTTON.

The wire coming from the CW from the driver. Move it to another pin on the breakout board and set the new pin in software.

• None of the motors turn when activated in demo mode

The motors could be wired incorrectly causing them to lock up. Make sure to check the wiring to make sure the X and Y are connected to the correct terminals.

Click the link to respond:
None of the motors turn when activated in demo mode

• WHAT IS THE DIFFERENCE BETWEEN PARALLEL AND USB ELECTRONICS COMBOS MOTOR KITS

The parallel (printer cable) port is uses the computer as its main source of pulse trains to operate the motor driver directly. Parallel ports are a direct connection from the processor commonly referred to as GPIO pins (General Purpose I/O pins) and provides a convenient and powerful way to interface with the computer. The parallel breakout board is included in those kits only to condition those signals for use with the drivers.

The USB serves at the actual controller, sending the pulse trains, but the computer sends simple human readable instructions to the USB controller to tell the controller how to send pulses.

The non-technical differences that may serve as the most important information to you is that the parallel configurations allow for a wider variety of industry standard software that can be used to control the cnc machine. The USB that we offer requires the operator to use a software called Planet-CNC software which is a very well made and feature full cnc control software.

Click the link to respond:
WHAT IS THE DIFFERENCE BETWEEN PARALLEL AND USB ELECTRONICS COMBOS MOTOR KITS

• I'm using Mach3 and I tuning the motors. As is they all seem to jog nicely, smooth and quiet. However when I make moves using gcode they bind and don't move or jerk violently when they do move. What step did I miss?

Your g-code probably has the feed rate too high. You set the velocity and acceleration in your motor tuning, but g-code may be able to override these values.

Try lowering the feed rate in either your CAM program or in the g-code manually. The feedrate code has an “F” then a number after representing the velocity.

• My Nema 34 Step motors get fairly hot to the touch. Is that normal?

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.

Click the link to respond:
My Nema 34 Step motors get fairly hot to the touch. Is that normal?

• what is the wiring coler and pin # for the whiteant extruder stepper motor

For our extruder motor wire color and pin would be Red(A), Yellow(C), Gray(B), Green(D). The 2 x 3 (6) pin connectors on our 3D mainboard, are connectors for motor drivers. Pin #1 is 12v, Pin #2 s ground, Pin #3 is step, Pin #4 is direction, Pin #5 is enable and, Pin #6 is 5v.

Click the link to respond:
what is the wiring coler and pin # for the whiteant extruder stepper motor

• What brand and/or country of origin are the stepper motors?

The stepping motors we sell are from China.

Click the link to respond:
What brand and/or country of origin are the stepper motors?

• What are the noise levels of the 1.5 Kw and 2.2Kw spindles?

The noise level of the 1.5 kW and the 2.2 kW are very similar. The noise level is considerably quieter than typical routers. I am going to add sound db levels to this FAQ a bit later.

The db (decibels) reading for the spindle is 70 and an 890 Porter Cable router (a lower powered tool than the spindle) measured 90 db. Both measurements were taken in the same environment and measured at the same distance from the tool.

Practically silent. The inverter makes more noise!

Practically silent. The inverter makes more noise!

Click the link to respond:
What are the noise levels of the 1.5 Kw and 2.2Kw spindles?

• 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!

• WHAT IS THE MOST EASY WAY TO HOOK UP MILL IN THAT AUTOMATICALLY STARTS WHEN CYCLE STARTS, AND STOPS GCODE THROUGH?

Does your breakout board (interface) have a relay? If so, you can connect one of the router/spindle's ac lines through the relay. The M3, M4 and M5 codes are used to control the router/spindle. Typically, the M codes are automatically added to the g-code regardless if you configure this in your CAM software. If you have the breakout board from buildyourcnc, you can go to the product page for the breakout board and the relay connection diagram and narrative is in the instructions on that page.

• My x and y motors are on each end of my gantry do I wire each motor to the same XP

I'm not sure what you mean by XP. Can you clarify? Thanks.

All stepper motors must be wired to their own stepper motor driver. If two motors need to be driven by one signal (say there are two X motors) then the two drivers will be connected to same CP (pulse or step) and CW (direction) pins on the control interface. If the two motors need to turn in opposite directions, then swap the A and B coil connections.

Whitch A+ or A - B + or B -

Click the link to respond:
My x and y motors are on each end of my gantry do I wire each motor to the same XP

• Can I use one motor drive 6A and conect 2 motor nema 24 425oz-in?, Can I do that??

Connecting two motors to a single, larger current driver, is not recommended. Theoretically, this may not be an issue; however, problems could occur where one of the motors draw more current than the other due to some external forces or friction and one of the motors stalling as a result.

If you need to have two motors turn in a synchronous way as a single axis, connect the two drivers to the same axis signal (the same step and direction pins from the breakout board).

Click the link to respond:
Can I use one motor drive 6A and conect 2 motor nema 24 425oz-in?, Can I do that??

Get Help with:
This Product
Orders
Tech Support
Sales
This Product
Order Query
Tech Support
Sales