×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# What hinge mechanism can be used to rotate a metal piece on another metal piece?

## What hinge mechanism can be used to rotate a metal piece on another metal piece?

(OP)
I am trying to find some type of mechanism where I can have a smooth but not too stiff rotation between two metal pieces. I was thinking of putting a shoulder screw through the pieces (the pieces will be side by side) and a nut at the end.

A real world example I can think of is how when you're unfolding a ladder, the part that unfolds has a joint where rotation occurs. It's smooth and stiff enough that you can let go midway and the ladder wouldn't collapse inward, but not too stiff that you have to apply so much force to unfold the ladder. What do they use to do that?

I attached a visual image of the hinge I'm thinking about.

### RE: What hinge mechanism can be used to rotate a metal piece on another metal piece?

(OP)
@IRStuff

In the picture, is the large part of the hinge lock mechanism and the hole it goes into threaded?

### RE: What hinge mechanism can be used to rotate a metal piece on another metal piece?

I am going to guess the "smooth but not too stiff rotation" in the OP's example relies on friction between mating parts. In turn, that relies on clamping force of the bolt & nut.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

### RE: What hinge mechanism can be used to rotate a metal piece on another metal piece?

Friction discs and orbit-formed pins.

### RE: What hinge mechanism can be used to rotate a metal piece on another metal piece?

I would look at fluid tripod heads, they are concerned with smooth rotational motion
https://youtu.be/jlJ-dRw-DyY?t=470

A layer of grease, delrin disk, or other friction reducing material can be used. If you have the space and budget, angular bearings or tapered roller with a pin/bolt at the center of the two machined metal plates, then as you go further out from the center of the plates you could have flat plates close together with a small gap that you fill with grease for the same effect.

igus makes a slewing bearing that does something similar.

Or a rotational damper but then the parts need to be geared.
https://www.takachiho-kk.co.jp/en/prod/mechanical/...

#### 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.

#### Resources

White Paper - The Evolving Landscape of Commercial Battery-Powered Trucks
Whatâ€™s driving the evolving landscape of truck electrification? What are the barriers, motivators and strategies for accelerating the electric transition? What insights and resources are available for todayâ€™s design engineers working to achieve industry disruption and evolution? For answers to these and other pertinent questions, read this white paper. Download Now
A lot has changed since the 90s. You don't surf the Web using dial-up anymore, so why are you still using a legacy PLM solution that's blocking your ability to innovate? To develop and launch products today, you need a flexible, cloud-based PLM, not a solution that's stuck in the past. 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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!