Screw - nut moving calculation

[Stefano]

Hello all,

I am Stefano. I visit your site a long time ago but this is my first time i post in your forum.

I have a motor that has a long screw on it's rotor. This screw rotates and moves a nut. on the nut, i have the load of about 14,5-15 kilos. I do not know how this assembly is called but i hope you understand what i mean.

The step of the screw is 8mm per rotation and the diameter is 22mm. I took it from an old machine that does not work any more 
I want to lift this weight about 3 meters. Can anybody suggest me what kind of motor should i use and what speed can it run? I do not want it to be very slow.

Thanks a lot people!

[kam]

You mean something like this?

[FelIX]

Why don't you make some tests?

[Stefano]

You mean something like this?

Yep. Exactly something like this.
The other way, corona - pinion i know how to calculate it. This not.

And i cannot make tests because i need to have test motors that i do not.

[spic0m]

I'm not so familiar with the matter but here's some links i scavenged.
Hope they help. 

http://www.roymech.co.uk/Useful_Tables/Cams_Springs/Power_Screws.html
http://www.roymech.co.uk/Useful_Tables/Cams_Springs/Power_Screws_1.html
http://www.roymech.co.uk/Useful_Tables/Cams_Springs/Power_Screws_2.html
http://www.pic-design.com/
http://www.powerjacks.com/
http://www.roton.com/application_engineering.aspx
http://www.roton.com/power_nut.aspx

[Keep_in_mind]

lol! so many formulas for calculating it? good appetite!

[kam]

I tried to get a simple formula to calculate it but it is indeed not so simple...

As you have already seen of course with spicoms links.

Use the links to find the answer. You must first of all find some parameters from your screw like the angle of the threads and the type.

[tpone]

 

[Stefano]

Please help me.
Anything easier like 1 type for speed and 1 type for the load calculation? I am not best in maths...

[FrED]

Why don;t you ask the one that you got this screw?

[spic0m]

And for a technical datasheet maybe, or a web link.

[spic0m]

I think this PDF is simpler, tell me if it helps.

[kam]

people i need to say this.

spic0m is the SEARCH MASTER of our forum

Thanks Spic0m

[tpone]

Wonderful! 

[Mercury]

Kam i have seen this Dr.Calculus page and it is very good!
My idea is that you could also add this into the page!