I have made a updated version you can check out here. kzread.info/dash/bejne/oXmE1LqlmtTLeKQ.html

Within about five seconds I fully understood how the old school recirculating ball steering mechanism works. Well done jttv2000.

I agree with others, a short tutorial would demonstrate implementation of a lot of good mates and animations considerations. Good video! I liked your 3D print of this, too.

@malta7406

4 жыл бұрын

You could look up some more thorough animations yourself if you’re still interested. There’s tons of tutorials out there, and services like Brilliant, Masterclass, Skillshare, The Great Courses, etc. which you can use to easily teach yourself through. Each site has its own free trial program, so you can find what you want to know for free.

Wow - cool!!!

thanks a lot dude!!!!!!!!!!!!! i've understand!!

Can you give a little tutorial on how to do it plz

The thread is opposite to normal twist. Why did you do that? On the other hand, this is awesome animation, and it helps a lot to understand the mechanism, thank you very much.

@jttv2000

5 жыл бұрын

Honestly I was not thinking about it. I just was trying to get it to animate. Believe it or not I had never seen one in person that was not buried in a machine. This was drawn with no physical reference. Edit: on second thought I wanted the animation to go from left to right. So it made more sense to me to do it this way.

I want solidworks assembly of this animation

Excelente trabajo.

@jttv2000

2 жыл бұрын

Muchas gracias

is there anything retaining the bearings? If it went off the end, would they all spill out?

@jttv2000

6 жыл бұрын

According to this model you are quite correct that the they would all spill out. In fact I made a few different 3d printed version of these and have accidentally done that several times. In the real word the shaft would have flat portions on each end so regular ball bearings could be mounted. The nut would then be trapped on the shaft until one of the ball bearings is removed. I did not do it here but the return tube is typically removable or the nut has some sort of mechanism to allow for the insertion and removal of bearing balls and grease after the nut is placed on the track. The helical raceway in the shaft is providing one wall of the path while the nut is providing the the other wall. In the helix section both walls have equal contact with the bearing ball (both walls together don't form a complete tube as there is a small gap left which can be seen at 0:54). Since neither wall has the majority of contact in the helix section neither part is really containing the bearing balls (they are closer to this shape "∪" and not like the letter "C"). Rather the bearing balls are trapped between two parts. When the bearing balls get to the end of the helix section a little ramp guides them into the recirculation tube. Either part separately is not able to contain the bearing balls.

So what makes ballscrews have very little backlash? I'm not really seeing it here. Is it simply because of the all the minor rotations from the balls themselves when they are piled up like that, on the thread, that backlash is slowly eliminated? I don't really see how a bunch of balls that can have tolerance stack up error amongst themselves, work themselves out along a ball thread like this.

@jttv2000

5 жыл бұрын

There are typically two raceways/nuts stacked on one screw. They are then slightly pulled towards each other so that backlash is eliminated. They may even be made in the same part if there is two return tubes.

wow!! how did you do that? I'm totally amazed. could you make a tutorial, please?

@malta7406

4 жыл бұрын

You could look up some more thorough animations yourself if you’re still interested. There’s tons of tutorials out there, and services like Brilliant, Masterclass, Skillshare, The Great Courses, etc. which you can use to easily teach yourself through. Each site has its own free trial program, so you can find what you want to know for free.

So basically each ball bearing "pushes" the nut from the screw shaft as they travel around a path, thus moving the screw in linear motion

@emre3304

Жыл бұрын

But I think the direction of the nut in animation is wrong. Balls are going left, then nut should go left as well. What do you think?

👍👌

Hello, can you share how you put all the balls into the groove? I don't know how to put them in the correct places in solidworks

@jttv2000

7 жыл бұрын

彭唯耕 umm hopefully I can explain this. Each bearing ball has a single 3d sketch point in the middle (origin). The ball assemble/nut has a 3d sketch that traces the path the balls take. Using the point on the bearing ball they are then mated to the path using a "path mate". Each path mate is set to a certain distance to start with so they don't overlap. In the animation each path mate (all 58 of them) has a separate path mate motor and there is one linear motor moving the nut along. In the future solidworks may allow 3d chain mates but as for right now this was the only way I could get it to work.

@makosmakos3746

5 жыл бұрын

@@jttv2000 there is a way to place all the balls inside in two-dimensional manner and not with a 3d drawing ??? for example I've done one assembly and I put a bullet inside... there is some way without 3d skech to put the other balls???

Is this like ball bearings to reduce friction?

@jttv2000

3 жыл бұрын

Yep.

Sir Please make a tutorial will help me in understanding motion study in solidworks

@malta7406

4 жыл бұрын

You could look up some more thorough animations yourself if you’re still interested. There’s tons of tutorials out there, and services like Brilliant, Masterclass, Skillshare, The Great Courses, etc. which you can use to easily teach yourself through. Each site has its own free trial program, so you can find what you want to know for free. You can also find many, much more topical tutorials and lessons on solidworks, this should not be your first move to learn about it from.

But I think the direction of the nut in animation is wrong. Balls are going left, then nut should go left as well. What do you think?

@jttv2000

Жыл бұрын

Nope its correct. Tho this old animation has the helix opposite most screws so you can see it more clearly. The bearing balls contact with the threaded rod and the nut moves the balls through the helix "backwards" then they leapfrog to the front via the return tube. My more recent animation has the helix in the traditional orientation kzread.info/dash/bejne/oXmE1LqlmtTLeKQ.html

@emre3304

Жыл бұрын

@@jttv2000 but balls go left by pulling the nut left, why nut should go right?

i don't think my printer can make this

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