What's the best NEMA23 Stepper/Servo? | Electronic Leadscrew Part 24

[@paulsanders4929]

Excellent video and testing. As I always tell my engineers in the words of the great W.Edwards Deming "without data you are just another person with an opinion"

[@ThantiK]

You deserve far more viewers with content like this.

[@Clough42]

I couldn't agree more. :)

[@alextreseder6274]

@@Clough42 with content like this, they’ll come pouring in at some point no doubt

[@rusticagenerica]

Sorry but I can only confirm.

[@JerrySpeedRC]

What parameter do you program to motor (if allow change settings) ? Tested by me NEMA 23 3,1Nm by factory defaultnis ser maybe to 50% of avaialble "power" after change settings to max limit is just stronger. Separate parameter for stall torque and for spinning. (iCS-2331-L)

[@lesthompson5907]

not to @@Clough42 why stepper motor a not a dc motor out of the mobility scooter ?, can you test one of them.

[@CraftedChannel]

I always learning something listening to your videos. And that is saying something since my wife constantly reminds me that I know everything. Look forward to the follow on video.

[@floatpoint1050]

This is some thorough testing but when you know your stuff, you know your stuff. Thanks for your effort 👍

[@simonconvey9645]

Wow ! At last, an objective test. I've learned alot. Yes, and pinch of salt is always to be taken when reading specs, but your tests are truly revealing. The important point here is the test method, and not subjective reviews. Data doesn't lie, manufacturers do.... Well done, keep it at it.

[@telelaci2]

I just found you today, and I like your videos. Pure simple engineer mindset you have, very smart one.

[@GLHerzberg]

This was indeed helpful to my climbing the learning curve on these CNC motors and drivers. I especially liked the comparison at 31:20 and have very much "taken it for what it's worth". Good one! 😉

[@dannyperry8070]

I am amazed at your patience. Very impressive.

[@DarkArtGuitars]

Thank you for this detailed test, this is very valuable for making an educated decision. I was considering going with closed loop, just because it's supposedly better, but seeing this, at the rpm I'll be using it, the difference to a digital driver is very small! You just saved me some money.

[@mmmikem]

And now you're on servos 😉

[@DarkArtGuitars]

@@mmmikem Indeed, the quest for more and more speed has finally lead me there.

[@ahmedlotfy8972]

The test method is brilliant, I mean rolling the string over the motor hub and pulling on one end

[@BM-jy6cb]

Excellent testing. Just the right amount of introduction upfront and then into the testing. Your production skills are fantastic. Thank you!

[@emreceylan9979]

Best video on this topic after watching several videos, thank you.

[@bobvines00]

James, thank you for an intelligent comparison of these motors. Your channel is one of the _few_ channels where I'm impressed with content _and_ intelligence.

[@mith5168]

Most excellent analysis...hmmm, now I understand why I’ve been creating “multi-start” threads so successfully 🤔

[@jrace2718]

Great comparison! Thank you for testing these so thoroughly and reporting your results.

[@Neo7CNC]

Fantastic testing and thoroughness. Thanks for the video

[@TaYpworm]

"This is why we test". Top-notch video!

[@bobuk5722]

Hi James, this investigation is valuable well beyond ELS as I'm sure you know and that is reflected in the title which will help with other search terms. Very interesting results and thank you. BobUK.

[@routercnc9517]

Well done James for putting in the effort to set all this up and do the editing! My CNC router runs 3Nm steppers on old analogue 80V drivers but I’m running at 70V as this really boosts the output over 48V.

[@raikbusse7697]

Very understandably explained, even for non-English speakers. One of the best videos I have ever seen. Please keep it up! Thumbs up!

[@tonyurquhart8278]

Thanks James. As always a very informative lesson & clearly articulated. You have a real gift in being able to show & explain complicated technical details in a way that most laymen can understand. Keep up the interesting videos, please... :) (& I like your quiet dry sense of humour too).

[@johnathonmullis4234]

I have closed loop Nema 24s & 34 on my pm-25mv and they seem to be adequate. I really enjoyed your entire presentation. Another great video.

[@Mike-ff7ib]

One of my favorite channels. Quality content.

[@marioc5277]

I requested a quote for 4 Servos at DMM Technology and the guys offered me a very nice discount so, Is my way to go, plus DMM servos have a 16 bits absolute encoders which is awesome. I would compare a DST 0.4kW AC Servo Motor (164 usd) + DYN4 AC Servo Drive (235 usd) with that Clearpath. Thanks so much for your channel, it is always professionally done in content and editing, I just like it even before see it.

[@Clough42]

So many motors... So little time... So much money. :)

[@beachboardfan9544]

OOo really looking forward to that clearpath/stepperonline battle!

[@DavidHerscher]

This channel is the way, the truth, and the light. Also, you've lost a LOT of weight, James. Good on you man, keep taking care of yourself you look so much healthier than 2 years ago.

[@Clough42]

Thanks! I feel better, too. Last weekend, I needed to move a 350lb piece of machinery, and I just lifted it onto the pallet. That was really satisfying. :)

[@adaptedmachining6951]

Perhaps the best thing I've watched on KZbin this year. Well done. Great content. 👍

[@greener121]

Thank you for doing this, lots of hearsay on the web, my first cnc was in 2004, and no one did this 👍 , this is a demostrative example to base decisions on. Btw, I know John at automation technologies personally and he’s a great person. I’ve done most of these comparisons and I’m going to the get the clear path for my z-axis on the g704👍😎. Awesome video, James.

[@dahut3614]

Great content! I didn't fall asleep until 39:20 when it got quiet!

[@steverobbins4872]

As an engineer, I agree with you. You always have to test key components to see if the data sheet is accurate. I've seen lots of power MOSFETs that have a safe-operating area much smaller shown in the data sheet.

[@RoboCNCnl]

finally someone using a prony brake instead of the scale test :) Nice work

[@rpavlik1]

"I'm all out of motors" and presumably money, given the price of some of these motors, yikes! Nice procedure and results!

[@arinchang6579]

I have some new clearpath motors if any one is interested.

[@Turkishmath]

@@arinchang6579 Definitely interested!

[@orangetruckman]

This is gold!!! I wasn’t knowledgeable in any of these things before watching your videos. Now, I feel like I’ve been exposed to enough information (all from your videos) that I’m comfortable on understanding everything I’d need for buying the ELS parts. Thanks all to you James 💪🏻 That 180watt stepperonline motor your going to test sounds like the one for me if it does decent on your testing 🤞🏻 Great video sir 😎

[@steveh8724]

Excellent video! Can't wait to see the comparison of the ClearPath vs. the StepperOnline Easy Servo!

[@asadaboobaker7465]

This is a great test, but also an excellent demonstration of why you shouldn't use the "smooth curves" plotting style in Excel with sparsely sampled data!

[@yagwaw]

Very interesting. Thanks a lot for putting in the work and sharing the results!

[@woodscreekworkshop9939]

The DOE was fantastic, I know it involved a lot of work. The data looks very interesting, especially when upgrading to a digital driver. Thanks! 👍🏼

[@danmartinrc]

This is very helpful. Thanks for taking the time to pull this together.

[@TheDigitalHombre]

Please take a look at the popular JMC servo with integrated driver 180 Watt. There is also a 400Watt version, and a new 200watt.

[@makerpunch191]

Hadn't heard of the idea of "electronic leadscrew" before this video - very cool idea!

[@fjb5894]

Great video! Hope to see last test shootout, using this to pull the trigger on a buy.

[@samvoelkel2046]

I very much like your method of measuring torque; I had not seen that before. I love electro - mechanical projects. Thanks.

[@Clough42]

I really wanted to build a proper motor dyno with a load cell at each end of a friction strap and a leadscrew to gradually apply the force, but realized I could spend the next six months developing it. that would be fun, but wouldn't really get me closer to my goals. :)

[@samvoelkel2046]

@@Clough42 Your method of measuring torque is excellent for those of us still trying to grasp the fundamentals of torque and horsepower. Nothing is hidden inside some arduino code communicating with a load cell; everything is out in the open and easy to understand. I think your method is both educational AND serves as a low-cost torque measurement system. I like it.

[@edwardaloftis6705]

I like your shop, mine is a tiny shop 8' x 16'. No off the shelf mill or lathe. I have a Skil drill press that I have built a conversion package for I call it SkillMan, that allows me to due some machining.

[@johndavid4825]

Just a thought to help ease up on the pressure -- if you tie the string around anything you can use as a lever, it would allow you to pull it against the vice and take a lot of variance out of pulling the string directly.

[@FilmFactry]

GREAT INFO! I would not have known how to test these. I have Nema 23s and a couple large Nema 34s and never knew really what the optimal speed/torque would be.

[@MirageC]

Fantastic video! Loved it :) Your test rig is genius! I own a set of ClearPaths on my 3D printer and I love them. Quiet and powerful they are truly impressive equipment.

[@agapiosagapiou]

Nice job one more time! As I understand probably the second line on the clear path motor is the 100%dude factor load.

[@Ale_Lab]

Really nice analysis. The last integrated servo are actually made by leadshine. I got the 200w made by JMC. They also have the same 180w ones. I hope the test comes out nice Becuase I got 3 of them! Great content as usually

[@Ale_Lab]

@@marcus_w0 same for me. Got them directly from JMC. I have now discover that the 200w version exist also with 10mm shaft. The 11m shaft size was a real nightmare. I am using steel pulley and che 4mm keyway in the was a real challenge. Good to know that they are working well for you! I bought them Rodger with a 1.8kw AC servo to replace my Nema24 on the BF20L (simil G0704) and the spibdle motor. All servos is the way to go :-)

[@Compasscard]

Just as a notice, for the hybrid motor, the torque curve was for 75v and you run 48v if I'm not mistaken.

[@hairyfro]

Expecting the Project Farm music to start any moment now.

[@dahut3614]

We're gonna test that!

[@joels4208]

Great video James!!! I purchased your ELS kit but have not installed it yet. I too did lots of research for the most affordable closed loop stepper for this ELS project. Many forums as well as the guys from Arizona CNC Kits (Who have tested loads of Nema 23/24 closed loops steppers) & Franco from Franco CNC directed me to a very affordable 4.0 Nm(566.56oz.in) closed loop stepper/32 bit digital driver (Stepperonline item# 1-CL57Y-24HE40). This closed loop stepper/driver kits sell for $90.56. It "appears" to be a nice fit for your ELS project. As I will not be using these components for 5+ months, I would be happy to loan the closed loop stepper/driver to you to put it on your well thought out testing rig. Thanks... Richard

[@Clough42]

I saw that "4.0Nm" kit, but if you look at the torque curve, it only claims just over 2.5Nm pull-out torque.

[@m3chanist]

Killer video James. Gold

[@RobytheFlorentine]

Thanks my dear, I will try to follow your input and transform my lathe, too. It will be a long term project as last time I had used trubopascla (25 years ago). I bought an arduino (knowing that probably it is not powerfull enough) but if it will work just a bit I will feel I won. Thanks for your videos, as a (small) youtuber I know how challanging it is and you make more then professional videos. I thank you a lot for your time and send my best regards from Florence. PS: When I should finish the project I will send you the link to my video...but don't expect it too soon :-)

[@rameezsheikh7576]

3D printed hanger also elasts little when force applied, so you have to substract that too, but doesn't matter if you are using same setup for motor to motor comparison.

[@machine2747]

Awesome video. Earned a new sub. My garage cnc uses the Clearpath SDSK-2346P-RLN and I really like them. Between the Clearpath and a Jianken 3.2kw spindle you can barely hear my machine running beyond the noise from the cutter. I remember the days when we all ran routers and it would run you out of the room with the noise. Again, great video. Thanks!

[@Clough42]

Yeah, I need to tear in to my mill to hunt down some backlash that has crept in, and I'm seriously thinking about the Clearpaths.

[@machine2747]

@@Clough42 My issues were in the shaft couplings. Changed to Zero-Max brand and everything improved 100%.

[@rbyt2010]

Great video! I built a similar machine (CP nema 32's with Jianken spindle) It is great :) FWIW I don't think the Teknic PS and cables are magic. I used a big, open-frame supply from AD, made up my own cables and they're fine. Just follow the specs and you can save a few bucks

[@machine2747]

@@rbyt2010 If you got the ATC option on your Jianken spindle Piotr Fox posted a link on some lower cost ISO25 tool holders. I bought them and have to say the runout measured as good as the $100 a piece tool holders from Parfaite. I think I spent just over $100 for 5 tool holders.

[@rbyt2010]

@@machine2747 Thanks, will check it out. Little behind on Piotr...

[@Surt40654]

Super great video ... thanks!! Not sure it's been suggested but if you add compliance to your cord at the finger-pull-end (spring?), you'll get a much smoother tension control in finger pull vs output tension resulting in more consistent measurements in pull-out torque. It will adhere to the winch equation -> LoadTension = InputTension * e^(Drum-CordFriction*CordWrapAngle) for the mechanical gain of your cord+drum winch system. You'll be able to control the InputTension (and hence output tension) better.

[@Clough42]

Oh, good idea. I didn't think of that.

[@millray38]

Brought back memories of physics lab! Enjoyed this one very much. Thanks.

[@nordishkiel5985]

Same here, although my professor would have turned me inside out if i had used the smoothed graph lines in a diagram. "If you did´nt measure it, don´t graph it."

[@Clough42]

Fair enough. When you get a lot of lines, the smooth lines make it easier to track a single line across the graph.

[@kevben6355]

This just energized me. Great work!

[@kevben6355]

Also, I would love to seem the math you used in that spread sheet to calculate Torque

[@9z4clb]

Very cool project. I'm building this for my old Grizzly G4000 lathe, going with the Rattm Motor 3N.m Closed Loop Set

[@azenginerd9498]

Love data! LOVE a well-presented analysis of said data. And live your test rig.

[@cogentdynamics]

Really interesting James! Thank you for that content. I’d love to have an ELS for my 15x60 lathe. I only know a little about this stuff so designing a full system is outside of my comfort zone for sure.

[@ivanadiego6067]

Maybe the higher reading at 1500rpm is due to how you are measuring the torque. If it's turning faster, then you have to account for the inertia of the core itself adding up to that final torque reading at the moment the cord brake grabs onto the cylinder.

[@ovalwingnut]

ShOcK & AWE comprehensive video. A KZbin video that all others will be compared. You "are" the Servo-Stepper Whisperer. Must See TV is back. Yeah, I'm pretty wound up. Subbed! :)

[@cabengg]

fantastic and helpfull testing , thank you

[@DefyBuildThrive]

Fantastic as always! Thanks for your work!!! Huge help.

[@dvlachy]

It would be nice back2back test also following combo: motor 23HS2430B, CL driver 2HSS86H. Together with an 1000ppr encoder it forms quite low cost combo with reasonable performance. I've tested it set to 3A RMS, 6.8A max. current draw in my application by a proper rotational torque meter, it tops at about 90W, but the resulted speed/torque characteristics can't be directly comparable with the methodology of this video for sure. sidenote: drivers configuration (esp. the current limit in closed loop and both PI controllers terms) are key to maximise the perfo. Tuning the RMS current up to the thermal limits of given motor for application duty cycle is the way to get the most of the system.

[@reedbj06]

Very helpful! Always love your videos keep up the great work

Thanks!

[@Clough42]

Thank you! Glad you found it useful.

[@frijoli9579]

Really enjoyed this content! DMM Servo is what I use. Would love to see what they do against the Clearpath

[@pengjinpan8293]

Very nice, always want to see such a thorough comparison between those motors. Also would like to see the comparison between spindle motors.

[@AmateurRedneckWorkshop]

Interesting comparison. My steppers on my cnc plasma seem to run out of go at about 100 inch per minute. Thanks for the video.

[@Clough42]

It totally depends on the dynamics. The KL-5056D with the "566oz.in" motors can run my G0704 at 400IPM, but I don't recommend it.

[@1pcfred]

@@Clough42 holding torque really does not mean anything when you are trying to move things. But it is how manufacturers suck customers in. They should just weld the shafts on stepper motors. 1,000 foot pounds of holding torque! This puppy ain't going no place.

[@1pcfred]

100 IPM is not bad. It's what I limit my CNC machine to. Any faster and I have trouble stopping it when I jog. But if you want to go faster you might have more power. It depends how close your drives are to your motors rated current. Being over or under will cause power loss. If you don't measure it there's no real way of knowing for sure. Don't believe what the drive says it is set at. It may be right and it may not be. My money is on if you've never checked it then it is probably not right. Break into a phase circuit with an ammeter and then jog real slow looking for the highest current reading you can find. Just start and stop a lot and take readings. They'll go up and down depending on where you are in the sequence. But after a bit you should be able to figure out where the high is. Compare that reading to what your motor current should be. It is like the Price is Right rules. As close as you can get it without going over is how you win. Over current stepper motors run like crap. So under is better than over. Over and you lose. Way under and you lose then too. I'd rather be a little under than a little over though. Make a video about it. I want to see what kind of drives you're running.

[@AmateurRedneckWorkshop]

@@1pcfred Thanks for the tips. I will keep the video in mind but no promise.

[@1pcfred]

@@AmateurRedneckWorkshop yeah you might be able to get more. What voltage do you run your drives at? Low voltage steppers run out of power at slower speed. Every volt nets you more. A surprising amount more. But every drive has an input limit. Better drives run higher voltage. It's what makes them better.

[@argonman1]

Nice work standardizing your test method, good head to head data.

[@Thekoolbiker]

Hi James and thanks for an incredibly useful video. Would be very valuable to measure the power off ‘residual torque’ (for lack of a better expression) of these steppers / servos. Sometimes you want to operate a machine manually while the stepper / servo is coupled but off. Then if considerable, ‘residual torque’ can play havoc with manual accuracy. Many thanks for an excellent channel.

[@ClockDesignCo]

Love this test. I was for a while ruminating over if I should invest in a servo system for my cnc. Have to say they don't appear to perform as well as I thought. Also, the clearpath system running at 72v should obviously take the lead given the voltage hike. I would imagine most of the other closed loop systems would have performed fairly comparable at that voltage, so this test is skewed in favour imo. That being said, I'll stick with my current dsp open loop system 👍👍

[@haenselundgretel654]

It is soooo reliefing that you're using the metric system. Cheers mates!

[@KnoxMachining]

Hey. Look at my little 570oz stepper GO! I need upgrade to the KL-5056D. I wonder what the KL-5056E would do. Does the full step, half step, quarter step change anything with the torque at speeds? I think I had it set for 1/8 steps. The Gecko drivers does some magic with the steps by converting the pulse train to full steps when it can. Good stuff!!!

[@bailey2829]

This is very valuable information. Thanks for taking all the time to do this study.

[@Jay.perez1]

Incredibly well done analysis !!!

[@lesthompson5907]

I am supposing i have to by both. The long red one as the control circuit board to control the led screw & to drive the digital read our that mounts on the lath, have i got that right. ? I would like you to exsplan why a mobility scooter motor is not gong to work >

[@frankward709]

Excellent information I Need a lot of that next year as I am working on my Project

[@cavemaneca]

I was excited to see the results for this, and you did not disappoint! As soon as you hooked up the Clearpath my first thought was "he better have run autotune in that setup". My experience with them is that they are garbage with factory settings, you absolutely cannot get away with running them untuned. Thanks for doing this test!

[@Clough42]

I did. Before autotune, the spool had enough inertia to cause all kinds of crazy behavior.

[@cavemaneca]

@@Clough42 sorry, forgot to add that I was glad when you said you'd done the autotune. But yeah, they use a lot of "smart" functions for handling torque based off expected performance.

[@cavemaneca]

@@Clough42 one more thing, if you want to test some more motors might I recommend Leadshine? They don't seem to be really well known, but they've got some supposedly high torque motors that are more compact than a lot of the standard Chinese clone steppers.

[@mysomervda]

Fantastic video, both for the methodology (I was wondering how I would set up a rig for testing) and the comparison of the results.

[@jasonh3109]

Absokuly amazing information!! Thanks James.

[@jessesheehan4051]

to get regular pressure on the string could you use weights hanging off the side of the table ? simply engage the weight when you want it engaged.

[@Clough42]

I'm engaging it progressively until the motor stalls. That would be pretty tough to do with weights.

[@wanglydiaplt]

Bravo for knowing the proper name of the Prony brake! ;-)

[@sudedemmanuel2975]

Very good presentation just watched it

[@BernhardHofmann]

I just started watching this. My wife looks over and says "oh, it's your friend" 😁

[@gregfeneis609]

21:23 Perform better depends on the desired criteria. Look at how flat and nearly level that torque profile is. Granted, you were expecting/desiring higher peak output, but that's still pretty good performance although not in brute force fashion. I guess nobody makes brushed dc servos any more. They have a lower max speed but lots of torque

[@varmint243davev7]

What were the settings on the stepper drivers ? What did you base making those choices on ? This would have a huge impact on torque. When I was testing stepper motors and drivers for a project last year, I found a definite balance point on the stepper driver settings. I was looking for the combination that didn't heat up the stepper driver or the motor over extended runs causing missed steps. My use case was a little different and I was only testing stepper motors not servos. I am unclear how settings would affect a servo motor that should compensate for "missed steps" I am reasonably certain a servo motor is necessary for any sort of accuracy and repeatability on a machine.

[@1pcfred]

Steppers are plenty accurate if they are powerful enough. You stall you lose. So you make sure you don't stall by overspeccing motor torque. If you never lose steps you will be both accurate and repeatable. Stepper motors get pretty hot in normal operation. Although excessive heat is a sign you are running them at too high current limit. And stepper motors will run bad then too. Steppers run better under current than over. Although they run best spot on. Some drives are better for adjusting current than others are. I like trim pots the best. As far as drives getting hot goes throw fans on them and beat them like rented mules. If they can output what your motors need they should be fine.

[@patjohnston70]

I have been doing some experimenting with a NEMA34 stepper motor from StepperOnline. it is wired in a series configuration. It has a holding torque (Bipolar) of 7.07Nm(1001oz.in). It is rated at 2.12 amps/phase. It is a two phase motor and - according to the documentation that came with the DM556T stepper driver, in series mode, the motor should be run at only 70% of its rated current to prevent overheating. The stepper driver current setting is (in this situation) set to: (2.12*2)*.7=2.968 amps. I am not able to start my stepper rotating at any significant RPM, as you did with your 100, 500, 1000, and 1500 RPM tests - your motors just jumped to those speeds with no noticeable hesitation. However, once I coax my motor to start rotating, I can slowly increase the RPMs to 1000 (or a little more) before it stalls. My question - why are you able to start the motors you tested at a high RPM and I can’t? Thanks for any advice you can give me.

[@ikbendusan]

what are your other variables? power supply voltage? microsteps?

[@patjohnston70]

@@ikbendusan I am using a 24 volt power supply - no micro stepping

[@ikbendusan]

@@patjohnston70 if that 24 V is reaching the drivers properly, then perhaps your motors have a high inductance which means you may not be getting the amount of current flow you're expecting; this becomes particularly noticable at higher rpm. since you've wired your stepper in series, you've doubled the inductance, making the problem worse. 24 V is also on the low end of the spectrum, which in combination with the inductance may result in the behaviour you're experiencing. so either wire them in parallel or feed them with a higher voltage

[@patjohnston70]

@@ikbendusan Motor: 34HS38-3008S resistance/phase(Ohms)@25 degrees C 3.2ohm±10％ (bipolar serial), 0.8ohm±10％ (bipolar parallel) inductance/phase(mH) @1KHz 32mH±20％ (bipolar serial), 8mH±20％ (bipolar parallel) Even before your reply, I began to suspect that the power supply voltage might be on the low side based on other comments on this thread I have purchased an Automation Direct STP-PWR-4805 46volt @ 5amp Power Supply - should be here Friday

[@ikbendusan]

@@patjohnston70 it's a problem with the combination of the inductance and the lower voltage. i ran a simulation (which i would show if google didn't ban links in the comments), and at 1000 rpm, even the parallel configuration with a 24V power supply outperforms the series configuration with a higher voltage. i'm not sure why you chose to wire them in series, but assuming your application requires more speed rather than more stall torque (which seems to be the case) you're better off wiring them in parallel rather than series if your driver can supply the current

[@Imba-gt7qi]

The Voltage is important for the torque. So 72 V against 48V differs wide.

[@1pcfred]

Seems like cash thrown is the critical factor.

[@brandonhicks7549]

Current limits torque, not voltage. Voltage limits speed. Voltage limits current at high speeds.

[@danpommerening3490]

Hi James very entertaining like all your videos. So one comment. As you are testing higher and higher rotational speeds the kinetic torque of the test wheels will be added in to the testing. It would be a good idea to subtract the force the rotational kinetic energy is adding from your measured force to get more accurate readings. HTH

[@Clough42]

This is a common misconception. The kinetic energy makes no contribution until the motor gives up. As I apply more and more friction force, the speed remains constant, hence kinetic energy remains constant, so it doesn't affect anything. Once the friction force is sufficient to overcome the motor torque, it gives up and the friction starts working against the inertia and brings the spool to a stop. Whatever level of force is present at that time determines how long the spool takes to stop, but the fact that the energy is now coming from rotational inertia doesn't change the friction force, hence it doesn't affect the peak force being measured.

[@danpommerening3490]

@@Clough42 K after thinking bout it that makes sense, thanks

[@lesthompson5907]

can a dc motor we ues on a mobility scoter be used as a led screw. deliver i have several spear can you test one pf them please les England They seem to have plenty of power & Torque I mounted one on my lath & it drive the led screw & saddle & cut a 40 thousand deep chip when engaged . Well tell me what you think . what is the difference ?.

[@g.tucker8682]

Very informative, thanks! I'd be very interested in a module on measuring/calculating required torque for a specific application, i.e. what size motor is needed to drive a lathe leadscrew or whatever. (I had to just go with the old SWAG method for my ELS.)

[@nordishkiel5985]

True, that would be helpful. Although there would be a lot of assumptions about the friction in the system, which would require a big safety margin. For the rest, it´s simple physics. You would need the mass / geometry of every accelerating part though.

[@cairun]

Awesome video! Detailed and insightful. Thank you!

[@T0tenkampf]

Is it possible that the closed loop reacts to the applied torque in such a manner that in the beginning of the test under little load it actually scales itself back to remain cooler? That was how I thought they worked.

[@mrechbreger]

The resonance should change with different microstep settings I guess (the resonance point will shift). You're hitting midband resonance. The other Servo is a JMC 180W Nema23 Motor, they're really nice. That motor should be more than enough for your setup. Mabye I skipped it but nowhere I heard something about your current settings.

[@skysurferuk]

An awesome, truly useful video. Many thanks!

[@twobob]

please, feel free to talk more about motors.

[@twobob]

Yeah, that was excellent

[@ikbendusan]

lol

[@twobob]

@@ikbendusan Genuine comment. I /actually/ want him to? :)

[@digus]

Excellent video, as always. Yea, if I don’t engage the halfnut gingerly, my Nema23/425oz stalls pretty easily, especially at higher speeds. I can make it work fine but I’d prefer a little more starting torque. G06062 here as well, 1:1 gearing (2:1 was much worse). I have the older DM556S, pretty sure it’s as strong as / or same as the KL-5056D..? Think I’ll step up to the larger motor like these Nema24/556oz you’re testing with.

[@Clough42]

I'm running my G0602 with 3:1 reduction. I think 1:1 would be a real challenge with any of these motors. I find that a little oil on the leadscrew makes a big difference.

[@digus]

@@Clough42 Thanks- I’ll give it a shot! Just to confirm- you are saying 3:1, as in the stepper motor spins 3x faster?

[@rengankrishnaiyer6912]

Superb presentation and details of the comparison cheers