Lead Screw, Ball Screw, and Roller Screw Cylinders: What's the Difference?

Electromechanical cylinder overview, comparison, and weighing the pros/cons of lead screw, roller screw, and ball screw cylinders. NEFF automation expert also gives a detailed look at hydraulic and pneumatic cylinders, including their best suited applications.
Chapters
0:00 Introduction
0:32 Pneumatic
0:42 Hydraulic
1:02 Electromechanical
1:44 The Common Denominator
2:13 Lead Screw Cylinders
3:15 Ball Screw Cylinders
4:15 Roller Screw Cylinders
5:07 Recap

[@heartminer5487]

how much stronger is roller screw compared to ball screw for the same form factor?

[@keithviolette5870]

I know this is an old question, but typically the roller screw can carry at least twice to many times the axial load of a ball screw. The balls contact at points, only two points (or 4 points) per ball. For the rollers, they have line contact at several locations along the length of each roller, so there is more area in contact to absorb the force, and lower contact pressures.

[@mervenur6376]

What is meant by saying impact tolerance?

[@rkusuma6852]

I guess, the resistance of impact whether it would be scratch, bend, etc

[@keithviolette5870]

If you were to hit the end of the screw with a hammer, the impact load would travel through the balls or rollers into the nut. In the case of the balls, if the impact is high enough, they will dent the surface they are rolling on, a term called Brinelling. (en.wikipedia.org/wiki/Brinelling) As the rollers have many more contact points and use line contact, the impact force is distributed over a larger area at a lower pressure, so the surface doesn't dent as easily.

[@tr_2292]

@@keithviolette5870 Thank you!

[@Dezzsoke]

but can it be backdriven?

[@keithviolette5870]

Yes, as the efficiency of roller screws tend to be high, they can be backdriven. Even with small screws, such as a Ø5mm diameter screw with a 1mm pitch can easily be back-driven.

[@aniljai405]

5 tan cepisiti numeric & prises juice press Anil kumar

[@ChrisGWGreen]

From the salesman - "The main disadvantage is the cost..."
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🤔
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Erm... sell it cheaper then?

[@DomCamilone]

Production cost is elevated comparing to a cheaper and simple-engineered option