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

@keithviolette5870

Жыл бұрын

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.

What is meant by saying impact tolerance?

@rkusuma6852

Жыл бұрын

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

@keithviolette5870

Жыл бұрын

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.

but can it be backdriven?

@keithviolette5870

Жыл бұрын

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.

5 tan cepisiti numeric & prises juice press Anil kumar

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

@DomCamilone

Ай бұрын

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