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General Category => Maths, Geometry, Physics and others => Topic started by: Stefano on March 18, 2008, 08:12:33 AM

Title: Screw - nut moving calculation
Post by: Stefano on March 18, 2008, 08:12:33 AM
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!
Title: Re: Screw - nut moving calculation
Post by: kam on March 18, 2008, 21:41:22 PM
You mean something like this?
Title: Re: Screw - nut moving calculation
Post by: FelIX on March 20, 2008, 11:10:04 AM
Why don't you make some tests?
Title: Re: Screw - nut moving calculation
Post by: Stefano on March 20, 2008, 23:11:05 PM
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.
Title: Re: Screw - nut moving calculation
Post by: spic0m on March 25, 2008, 22:39:20 PM
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
Title: Re: Screw - nut moving calculation
Post by: Keep_in_mind on March 26, 2008, 05:17:29 AM
lol! so many formulas for calculating it? good appetite!
Title: Re: Screw - nut moving calculation
Post by: kam on March 27, 2008, 00:07:07 AM
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.
Title: Re: Screw - nut moving calculation
Post by: tpone on March 27, 2008, 22:33:01 PM
 :-\
Title: Re: Screw - nut moving calculation
Post by: Stefano on March 27, 2008, 23:05:43 PM
Please help me.
Anything easier like 1 type for speed and 1 type for the load calculation? I am not best in maths...
Title: Re: Screw - nut moving calculation
Post by: FrED on March 28, 2008, 00:24:33 AM
Why don;t you ask the one that you got this screw?
Title: Re: Screw - nut moving calculation
Post by: spic0m on March 28, 2008, 00:28:49 AM
And for a technical datasheet maybe, or a web link.
Title: Re: Screw - nut moving calculation
Post by: spic0m on April 01, 2008, 01:27:29 AM
I think this PDF is simpler, tell me if it helps.
Title: Re: Screw - nut moving calculation
Post by: kam on April 01, 2008, 23:26:59 PM
people i need to say this.

spic0m is the SEARCH MASTER of our forum


Thanks Spic0m :-*
Title: Re: Screw - nut moving calculation
Post by: tpone on April 03, 2008, 18:37:57 PM
Wonderful!  8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8) 8)
Title: Re: Screw - nut moving calculation
Post by: Mercury on April 05, 2008, 13:06:06 PM
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!
Title: Re: Screw - nut moving calculation
Post by: Keep_in_mind on April 05, 2008, 17:33:27 PM
Lucky you. You have spic0m!
Title: Re: Screw - nut moving calculation
Post by: kam on April 06, 2008, 18:43:50 PM
He is the moderator!  8) COOL