Power Screw !! Sad
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Posted by: watzmann

04/19/2005, 12:12:57

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Need your help plz , i'm designing a mechanism which is using a power screw in it .
so my problem now i want to know how to calculte the diameter of the my power screw if the Load on it = 200 Kg and the length of the power screw is 1.50 M , can anyone please tell me the formula to calculte this problem .


Thanks too much








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Re: Power Screw !! Smile
Re: Power Screw !! -- watzmann Post Reply Top of thread Forum
Posted by: msenousy

01/03/2006, 17:47:47

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you can check the book entitled "MACHINE ELEMENTS IN MECHANICAL DESIGN' by Robert L. Mott, Chapter_17. All forms are there.

g. luck








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Re: Power Screw !!
Re: Power Screw !! -- watzmann Post Reply Top of thread Forum
Posted by: devitg
Bart
04/21/2005, 23:56:59

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A power screw shall be consider a enveloped wedge .
Its heigth will be 1,50 meter , is't lenght is what do you have to state.
Guess yo use a 3 mm pitch screw , you will need to turn it 500 turns.
The wedge lenght will be the screw mean diameter * PI * 500

So if the screw is PULLING the load , any 3 mm pitch screw will do it.
But if the screw shall PUSH UP the load , a lot of other facts have to be in consideration.(buckling is the main)
Other main fact is in how many seconds , minutes or hour , you want to up the load.
Now re think your problem









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