×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Clock or counterclockwise helix direction

Clock or counterclockwise helix direction

Clock or counterclockwise helix direction

(OP)
Has helix direction any influence in unscrewing a threaded element? Would appreciate advise in this matter. Has to design a compression spring for a valve disk, whose cage is threaded to the valve seat body. Do not want to lock the cage to the valve seat due to disassembly difficulties.

RE: Clock or counterclockwise helix direction

Hi maccosvg

The simple answer is yes but it doesn't matter which way you wind the spring because depending on whether the deflection of the spring is small or large, the compression spring coils will wind up for the former and for the latter unwind.In addition any axial force acting on two components screwed together will have a tendency rotate one relative to the other due to the thread helix. Can you give more details of the spring and valve parts and any (sketches which can be provided which can be placed in here using the
"process TGML" option at the bottom of the message box)so we may help you further.

regards desertfox

RE: Clock or counterclockwise helix direction

(OP)
Desertfox:
Thanks for the information. However, since it is a compression spring of a moving valve, if the helix tryes to unscrew the cage (it is threaded to the valve seat)the spring will do so all a time of the opening and closing of the valve (450 times/minute)
That is why I need to know if the spring is made counterclockwise, and since it is always in compression state, which direction it tends to turn the supporting memeber (the cage). I do not have a sketch now but will have one available tomorrow.

Regards

RE: Clock or counterclockwise helix direction

Hi maccosvg

It is against site policy to enter into private email, can you enter spring information here ie all dimensions and spring rate, number of turns how much is the spring compressed on installation and after the valve operates.
You can place images on here use the process TGML at the bottom of the message box.


regards desertfox

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close