Difference between servo and stepper motors in CNC router 

Wow they machined the air perfectly, looks identical on both devices!

So glad to come across this actual side by side comparison. This definitely helps out in seeing the value of the additional costs for servo.

There is one thing everyone seems to forget. It is nice to see the machine moving fast when not cutting. But they will both do the exact same when they do. The main advantage of servos are torque and precision. They got higher torque than steppers and they got a feedback loop so they can’t make a mistake, whereas stepper can skip steps. Speed only matters when they are in rapid positioning mode before and after cutting.

These "comparisons often put $1000 AC servos against $50 steppers. Start with comparable budgets and it's a different story. Both steppers and servos come in a broad range of power, speed and torque. These can be further adjusted with gearing and / or faster balls screws. In terms of the part you get at the end and machining time, there's often little difference if the motors are sized correctly and CAM settings are correct. This decision is usually made by the budget.

Wow, this video is so powerful in convincing about the difference. It seemed to take forever for the step motor to finish after the servo stopped moving.

Hola. Gracias por compartir. Que marca de servos es ? Que marca de closed loop steper es?

That sounds really really stepper, but can feel that installation is good. 😀

What kind of steppers are those? Closed loop or opened loop?

Since this test only uses the free-running state of the machine (to reposition the milling bit in fact between milling positions) and you should use fixed milling speeds for a specific material and milling bit, the end-result could be negligable when your mill is constantly being used, or am I wrong? I saw some videos where they calculate the proper feeds and speeds for a given bit and material so if the bit is being used 100% of the time, the speed difference can be ignored when the machine isn't using high-speed to move to a different position to start milling elsewhere in the work-piece. You could optimize the pathing in the software to use a minimum of high-speed repositioning instructions, then it shouldn't make a big difference. I could be wrong since I don't have a CNC machine yet, but I'm considering to build one myself using Nema23 steppers (3Nm holding force) for milling wood. And since my budget is limited, I don't think I have much choice (at least to start with) to start using steppers instead of servos.

What size stepper motors did you use?

And of course, the price difference between those two exact machine with different electronics is huge. Am I right?

Awesome..... except of course in 90% of all cases your spindle isn't going to cut the material fast enough to warrant the extra servo motor speed. The accuracy of the servo's to me is a much more important factor.

La fresa se banca esa velocidad de movimiento?

Does the same apply for Hybrid ( Closed loop) Stepper motors? I run the Leadshine Easy Servo aka Hybrid Stepper on my machine. Very nice side by side comparison.

thank you i m going to purchase CNC ,,,differnce between steper and servo

Thanks for this video. I am running steppers and am impressed with the speeds you are getting with them. But yeah I definitely want some servos 😁

Unless the software driving the machine is super smart and knows the acceleration curve - does it really matter? IRL it probably has to be a linear curve to sync the two axis when cutting anyway. No? Or what am I missing?

Care to explain how the time is one minute apart, when the feedrate and acceleration speed are 50% within each other?

Is there a big difference in power/electricity consumption, given that steppers are less efficient ?

Cool! Which servos are you using?

These servos appear to be suffering from a voltage issue. The gantry is having trouble launching off of the table and through the wall behind them. I suggest switching to solid state rocket boosters for additional torque.

This is servo or hybrid servo?

How much is the servo?

Notable is the difference between acceleration-deceleration-acceleration. The machine on the left runs at a constant speed, while the machine on the right is highly responsive during stop-acceleration. This enables high-speed movement between points and reduces unnecessary time consumption between the work point and the next work point. Of course, the machine on the left, moving at constant speed, can expect excellent precision.

at the beginning you can see that 2 different gcode machines make different movements so what's the point of comparing it. The Servo first goes straight backwards on one axis and the stepmotor goes diagonally. I have no doubts that the servo is faster, but I'd rather see the same movements and the real difference in time.

Which one is a servo and which one is a stepper motor

This is great...how much sir?

i dont gwet it. which onw is servo and which is stepper motor? RIght or left one is servo??

Nice which stepper motor are u using

Good asmr

Right side servo

Any one can explain why in my case both Actual Working Speed & Machining Time comes exactly same in both Closed Loop Stepper & Full Servo System. Manual Jog mode Speed Difference can be noticed easily but when the Programme runs through Weihong NK 105 Controller. Both machines gives the same identical speed and time output. Also tried with many internal speed parameters in Weihong controller and Played with pulses also in Servo Driver to overcome this low speed issue in full servo. But no results till yet Any experience or suggestions would be appreciated Thanks

servos are great but 10 times the cost

You get the speed and you lose the resolution . you can’t mill heavy metal using this speed or the mill end will pop up correct me if i’m wrong

This is an idle move. Which takes up little on average. In real work, the indicators will be different.

i mean, if you're using this to produce parts that you're selling and you're limited by how fast you can pump them out, seems like an easy choice.

Which one is running faster on the highway, a Jeep (50 k car) or a Ferrari (100 + k) ? Of course is gonna be the Ferrari. By how much ? Well, it depends on the length of the highway; the longer the highhway, the bigger the time difference between the two . Will this speed difference stay the same when actual milling things ? Hardly. Indeed, hole making is one particular application where the time difference stands out. Any other type of operations ? (facing, contouring, pocketing, etc) Not really. Is it worth the upgrade ? It really depends on the type of work and how fast the management is able to take orders in a year; if 2 months are really busy and 10 months are rather "relaxed", it probably wouldn't justify the effort. In reality when milling, the time difference should not be more than 10-15 %, bearing in mind that it is not a fully automated job and setup time is the same for both servo and stepper motors. There are many operations where milling is 20% and work setup is 80% of the time. Too many sometimes.

Why servo systems are so much more expensive? Isn't it just a generic stepper motor with encoder and drivers on it's back? That would be basically only addition of a encoder vs normal system.

Which one is servo?

Should I buy stepper motor router or not please help me

Price of servo motor CNC router machine...........

Can a servo motor be as strong as a stepper motor of equal size? And also, can any of the 2 different motor-types be modified to run almost competely silent? I need a motor that can lift an object weighing several kilograms at a decent speed, without sounding like a 1980's printer behind a megaphone! 😅 (Imagine it operating in your bedroom at night, by lifting up a TV from the ground at the end of your bedframe in like 5-7 seconds - without waking up your wife! 😂) I know that steppermotors are cheaper than servos in general, but the difference in cost is not really that important in my case.

cutting material will be very little difference in speed

best speed in G00 mode.

of course the torque in stepper/speed vs servomotor/speed is not equal, your servos are better.

Left is stepper n right Is servo

Both seem overkill for a tattoo artist though

Stepper motors can have encoders.

No es necesario un servo motor ni para cortar madera, ni para cortar metal con un corte de plasma. La unica diferencia son las traslaciones que son mas rapidas, pero en terminos de lo que se corta, NO! La exactitud es la misma, si se tiene zeros absoluto de la maquina.

servo on right side....

aren't servo motors just stepper motors with an encoder and closed feedback loop? it should be the same result

Replace the motors with Teknic Clear Path Step and Direction motors for more production with less vibration and noise.

step motor overlaps by servo motor... 🤣🤣🤣