You'd never take apart a precision machined and ground ball screw. They are silky smooth and taling it apart will only serve to damage or makes things worse. The cheaper the rolled ball screw, the worse the balls fit the grooves. I've seen then where they contact less than 20% of the groove and the contact area is in different places on each side of the groove. The balls spin in directions they shouldn't and they sound awful. Your better off living with the higher backlash then trying to correct it. Run then in for a few hours and they get better. Trying to clean with wd-40 and blowing out with shop air can make things a lot worse. Unless you got high end water, particle and oil filters installed your blowing in air contaminated with water, oil and particulate. The standard ones that come with compressors or home depot do nothing to stop this. They let as much water and oul through as they stop. Simplev air tool motors don't care as long as they see a bit of lube, most bearings are sealed in these. If your blowing out any bearing with air or using a parts cleaner to clean the bearing you've effectively reduced the bearings life by atleast 50%.

seems too much, unless I could somehow reduce the steps to a point where literally it was barely turning, but I dont know if that would work.

they have an super lead as they call it. its about 3 rotations to go the entire 400mm

Hey brother! I have a question. I bought a set of 3 THK 2040 Ballscrews about 2 years ago. Well I just dug them out and I need to clean them, but more importantly, how do I find out information on if I can use them for my cnc? I went to THK website and its all locked down like fort knox haha

Hi, I really enjoyed your video series in making your industrial size CNC. I am wondering if you have the video of the process in making the rotating ball nut. I watch what you had posted carefully and wanted to know how you got the gear installed. Thanks... BZ

Use a cbn plated wheel. Way safer and you don't have to dress it!!!

Nice work on the driven nut I am working on a 3 meter screw. Driven nut Ballscrews are hard to find

👍👍👍👍👍🙏🙏♻️

Where did you get that actuator? It would work perfect for my application.

👍

Utter genius

Design Option 1: Steel Rod Rotating at 100 revolutions per second Moment of Inertia of the rod (I): 0.40625 kg·m^2 Angular Velocity (ω): 628.32 rad/s Rotational Kinetic Energy (E): (1/2) * I * ω^2 Result: The rotational kinetic energy is approximately 80,562.5 joules (J). Design Option 2: 10 kg Object Moving at 70 cm/s Mass of the object (m): 10 kg Velocity of the object (v): 0.7 m/s Kinetic Energy (E): (1/2) * m * v^2 Result: The kinetic energy is approximately 0.245 joules (J). Conclusion: Comparing these two design options reveals a significant difference in terms of kinetic energy. The steel rod rotating at such a high speed (100 revolutions per second) possesses substantial rotational kinetic energy, approximately 80,562.5 joules, due to its moment of inertia and angular velocity. On the other hand, the 10 kg object moving at 70 cm/s has much lower kinetic energy, around 0.245 joules, due to its lower linear velocity. This difference in kinetic energy is crucial when considering the design and application of these systems.

The rotational inertia should not be limited to the mass difference of the nut vs screw, but how much of that mass is distributed away from the center of rotation- I suspect that the rotational inertia is not as much of a design constraint as you may think- the inertia of the gantry will obviously be more of a factor, so being able to put the motors on the table rather than gantry would be nice. And as another person posted, spinning the ball nut will complicate the oiling system. But there is never a right way or wrong way- very nice work and good job thinking outside the box!

WOW! You've got big balls!!!

Was thinkning of upgrading the work 5x10 router to this so it can handle steel, now makes me think that I'm gonna have to put in a lot of care into designing the rotating nut mechanism and finding good screws... great vid!

Did you consider using a rack and pinion? Getting close to ordering something myself, but still researching.

That other cnc machine you built was huge 👍

So you did all this work to use them with WD40?

Pay attention when using shopvac: do not leave paper or wood chips/dust inside the collection bin. It can catch fire if you are extracting hot sparks and it will do it pretty quickly because of the fast airflow! Maybe fitting a wet sponge on the dust port can help to stop some flaming sparks to get into the bin, but always clean and check if your filter is not melting/burning too.

I have a question about this. Since there are limitations with the top speed of the shaft rotating when very long, and there are also limitations with how fast you can spin the ball nut. What if motion happened by rotation the shaft at some arbitrary rpm and then you also rotate the ball nut? So speed would then be multiplicative.

how is that running? i heard from an weapon freak, that WD 40 is the root cause of many western mechanical problems.... and i suppose, that this might have killed my bicycle ballbearings. i am not shure though.....

I guess, the magic word is deflection here. if you have a body that long unsupported, it will hang through. and steel is rather one of the stffer materials already. though its also heavy. there are plenty of people who turn to rack and pinion solutions therefore. I have no idea if that threatens steel cutting procedures then, but cutting steel with a cnc that size does not really sound approachable and reasonable anyway. maybe at the front and the end of the screw. but in the middle...? even 12080 aluminium bars have a deflection in milimeter rangee only after 1 m. so rack and pinion is not so gravity dependent. and pulling the screw.... i do not know how. propably some freaks do that. but that needs forces actiing constantly.....

Hi there just wondering if you have an email or if you would do a short whats app, I am based in Ireland, I am currently speaking with bstlinear about some ball screws and linear rails would lie to get your opinion and advise.

call me crazy, but what about a combination of both? nut rotating twice the speed of screw makes for a 10mm pitch. much faster rapids. conversely, driving it at half speed gives 2.5 or something. higher resolution. may need some fancy software to morph between high resolution to coarse as it feeds and rapids... then again, its just differentials... easy to mentally picture, hard to write as an equation... :D

make a water curtain that you can place anywhere sparks or sus go. Use a fish tank water pump, and have a 50x30cm back drop, have the spray bar on top too creat a “mobile water curtain”

Great stuff!😁 I'm considering a rotating ball nut design on a 1.5m long axis to avoid screw whip. One thing I can't figure out is how to lubricate the nut; as it's spinning I can't just add a lubrication line! How are you doing this on your build?

That’s really clever…it never dawned on me that a mill could be used as a surface grinder! I’ve been lusting after a surface grinder for some time and weighing up the options. They’re bloody expensive to buy new so I’ve been looking at DIY options…the conclusion I came to is that I don’t have the skill or right equipment to make something anywhere near as accurate as a ready made one. This however is achievable. Thank you 😊🙏

Beautiful work my friend.

Paper towels leave tiny flakes of paper everywhere. Recommend microfiber wipes

That ballnut seemed to contain far fewer balls than I've seen in other nuts, though admittedly my experience is limited to little more than repacking the one I accidentally messed up installing on its screw.

Was the ballnut originally designed to be driven or did you modify it? If you did, then how did you affix the gear teeth?

I was always told the dti gauge plunger should be perpendicular to the workpiece for an accurate reading - something to do with Pythagoras ??

Please tell me how strong your nema motors on your x y and z are? Are they 3 nm or less?

Very impressive!

Hello Dear Friend, we are original ball screw factory, can we have chance to cooperate? Thanks.

i wish i have a neighbour like you to work with.

WD 40 is not (!) an lubricant. It removes the grease from the bearing balls. Better you use an hydraulic oil. A good grease is dumping the klicks from flipping the bearing balls into an other direction.

Hi friend... I don't know if you read these comments... I actually enjoyed your build.... although, I am a designer, and I want to put this into CAD... specifically SolidWorks V2022. And I have a few changes I want to make. I would enjoy to benefit from some of your experience... such as what size your ball screw is, and where you got your parts. What size Servo Motors, and where did you get your controllers and other electronics. I am a mechanical designer, not an electronics guy. That is why I am asking for such information. I hope you can help me. Have you put together a materials list and where to get the materials? Also some tips about setting up and software you are using for your setup. I do have access to CNC Mill, and a nice lathe and surface grinder and other equipment so I can do this project. So... if you would be inclined to assist me I would really appreciate it. If your willing to assist me... I am willing to provide you with my designs, and also the plans I make. P.S. setting up the electronics is going to be an issue for me. I can put together components to build computers... so I do have some experience with playing with electronics. But I have never worked with controllers and servos. I can be reached at... I am Leslieallen [email protected] Please contact me. Friend... if you have Signal Messenger it would be a big help, that way we can easily communicate using video or messaging. I prefer video actually. Anyway, write to us if your willing. Thank you. I will post this on each of your pages... so hopefully you will see it.

Hi friend... I don't know if you read these comments... I actually enjoyed your build.... although, I am a designer, and I want to put this into CAD... specifically SolidWorks V2022. And I have a few changes I want to make. I would enjoy to benefit from some of your experience... such as what size your ball screw is, and where you got your parts. What size Servo Motors, and where did you get your controllers and other electronics. I am a mechanical designer, not an electronics guy. That is why I am asking for such information. I hope you can help me. Have you put together a materials list and where to get the materials? Also some tips about setting up and software you are using for your setup. I do have access to CNC Mill, and a nice lathe and surface grinder and other equipment so I can do this project. So... if you would be inclined to assist me I would really appreciate it. If your willing to assist me... I am willing to provide you with my designs, and also the plans I make. P.S. setting up the electronics is going to be an issue for me. I can put together components to build computers... so I do have some experience with playing with electronics. But I have never worked with controllers and servos. I can be reached at... I am Leslieallen [email protected] Please contact me. Friend... if you have Signal Messenger it would be a big help, that way we can easily communicate using video or messaging. I prefer video actually. Anyway, write to us if your willing. Thank you. I will post this on each of your pages... so hopefully you will see it.

Hi friend... I don't know if you read these comments... I actually enjoyed your build.... although, I am a designer, and I want to put this into CAD... specifically SolidWorks V2022. And I have a few changes I want to make. I would enjoy to benefit from some of your experience... such as what size your ball screw is, and where you got your parts. What size Servo Motors, and where did you get your controllers and other electronics. I am a mechanical designer, not an electronics guy. That is why I am asking for such information. I hope you can help me. Have you put together a materials list and where to get the materials? Also some tips about setting up and software you are using for your setup. I do have access to CNC Mill, and a nice lathe and surface grinder and other equipment so I can do this project. So... if you would be inclined to assist me I would really appreciate it. If your willing to assist me... I am willing to provide you with my designs, and also the plans I make. P.S. setting up the electronics is going to be an issue for me. I can put together components to build computers... so I do have some experience with playing with electronics. But I have never worked with controllers and servos. I can be reached at... I am Leslieallen [email protected] Please contact me. Friend... if you have Signal Messenger it would be a big help, that way we can easily communicate using video or messaging. I prefer video actually. Anyway, write to us if your willing. Thank you. I will post this on each of your pages... so hopefully you will see it.

Hi friend... I don't know if you read these comments... I actually enjoyed your build.... although, I am a designer, and I want to put this into CAD... specifically SolidWorks V2022. And I have a few changes I want to make. I would enjoy to benefit from some of your experience... such as what size your ball screw is, and where you got your parts. What size Servo Motors, and where did you get your controllers and other electronics. I am a mechanical designer, not an electronics guy. That is why I am asking for such information. I hope you can help me. Have you put together a materials list and where to get the materials? Also some tips about setting up and software you are using for your setup. I do have access to CNC Mill, and a nice lathe and surface grinder and other equipment so I can do this project. So... if you would be inclined to assist me I would really appreciate it. If your willing to assist me... I am willing to provide you with my designs, and also the plans I make. P.S. setting up the electronics is going to be an issue for me. I can put together components to build computers... so I do have some experience with playing with electronics. But I have never worked with controllers and servos. I can be reached at... I am Leslieallen [email protected] Please contact me. Friend... if you have Signal Messenger it would be a big help, that way we can easily communicate using video or messaging. I prefer video actually. Anyway, write to us if your willing. Thank you. I will post this on each of your pages... so hopefully you will see it.

waiting for more

Hi can anyone tell me if is possible to have a play in the nut if I rotate the screw manually not one full turn just a little bit let's say 20 percent and the nut won't move is that normal ?and what could be the cause tnx

This is sketch on sooo many levels. But hey, you do wear a dust mask so 👍

Suïcide machine. That disc shatters and it will send sharp fragments across the room with high kinetic energy.

Kindly show me how to fix Ball screw, any loosing screw may slip and server motor will move to wrong position. i need to learn about it

Hello! I had a quick question. I'm currently designing up a different type cnc, and it appears rotating nut ballscrew might solve some of my problems. I remember reading somewhere when researching this for a router that there are some issues with using a regular ball nut in this way, and I can't seem to find that again. Do you happen to know what these concerns are? I am going to get a ground THK ballscrew not rolled, and I can accurately mount the double angular contact bearings concentric with the screw. I remember there being something else. Like maybe how the internal ball path is? but to me it seems like the balls take the same path either way. but they would be spinning and therefore centrifugal acceleration would cause loading on the ball return channel or something?

Nice, but please really make a guard, its extremely dangerous.

Salut I'm in the process of decision , if I transform my router like yours . I have a 3 meter x 40 mm ball screw and the whipping is not very pleasant. My ball screw are 62 mm exterior diameter and it making bearing very expensive. But your seam to work well so I'm thinking ...

nice idea , seen it before with a cupped stone but never though of using a straight stone and the quil for height ajustment using the quill does introduce some variation (if it isnt clamped down after adjusting it ) have to look intoo the idea , thinking right angle plate and a magchuck set up on the crossstable , only problem is setting it up so its trammed exactly right for surface grinding might make a different arbour for the stone too , one with an mt4 taper that i can chuck straight in the mill