I would like to know what the dynamic force load is....

[omarmorocci]

Before doing anything else work out whether your calculated acceleration figure gives you total motion time for the platen consistent with your practical observations .

I used excel to vary the angle and hence get different angular accelerations,
In real life, the anglar speed seems to be contant but I am not really sure how to confirm this since the whole motion is only about 20 degrees and in 1.5 seconds

 

[omarmorocci]

.

 

[Divya Shyam Singh]

First of all:
GOOD work with the calculations.
In real life situations, there are resistive frictional forces at every hinge point whose resistive moments have not been considered here.
Also, the actual force output of the actuator is less than the theoretical force given in the actuator manual etc.

One thing i wanted to bring into your concern is that since the angular acceleration is increasing constantly over the range of motion, there will be a "collision" at the end between Hinge at B and the upper most portion of the slot. Over the time, due to constant impact loads on hinge B might be deleterious.

 

[omarmorocci]

First of all:
GOOD work with the calculations.
In real life situations, there are resistive frictional forces at every hinge point whose resistive moments have not been considered here.
Also, the actual force output of the actuator is less than the theoretical force given in the actuator manual etc.

One thing i wanted to bring into your concern is that since the angular acceleration is increasing constantly over the range of motion, there will be a "collision" at the end between Hinge at B and the upper most portion of the slot. Over the time, due to constant impact loads on hinge B might be deleterious.

Thank you for your words,

Fortunetly, the collission does not infact happen as the pneumatic cylinder reaches it's maximum length before the shaft hit the end of the slot, so there is no damage there.

 

[Divya Shyam Singh]

May i ask where this component is currently used? what is it related to?

 

[omarmorocci]

May i ask where this component is currently used? what is it related to?

It is used in sorting packages for companies like DHL Fedex etc

 

[omarmorocci]

Come in contact with someone from the company and talk to them. They usually have a software where you 'd have to enter your value. Trust me, they are better at selecting the right bearings for you. I tried doing the same calculations, got some values, fixated on some model of bearings, talked to their technical guy and it turns out that whatever i had done was all in vain.
You could also ask them to suggest you the right bearning model for your use.
Please do tell them the correct conditions in which the bearing is to be used. (like environmental conditions, loads, Life of the component that you want)
One important aspect is serviceability which basically means how often can you get the bearing serviced.

Try to get as much information regarding bearing as possible from the person you talk to. He will be more than happy to help.

Hope this helps.

I believe there was some simple calculation to find the pressure ,
It is force/area but I am not sure on what area to take ( is it diameter * thickness)?

 

[Divya Shyam Singh]

No, actually i was talking about a project i worked on a few months back. Its always better to talk to them ask what all parameters do they require for them to be able to decide for the best bearing.
But yes, generally its Force/Area for deciding the pressure required from the actuator
I don't know about the bearings though. In my opinion it actually depends upon the bearing. In general maximum contact pressure is derived by using hertz law but there are a lot of other factors in play so its quite complicated when designing bearings for practical purposes.

 

[Nidum]

http://www.astbearings.com/technical-information.html