×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Question on Calculating Force on a Roll Pin

Question on Calculating Force on a Roll Pin

Question on Calculating Force on a Roll Pin

(OP)
I am not sure how to calculate the force due to compressing the spring pin (diameter) into a hole.

Can anyone enlighten me?  Is the Force exerted on the hole simply delta diameter * Spring force?

This is the type of pin I am refering to;
http://www.micromatic.com/images/3/300x300/100-302.jpg

On my spec sheet I see;
JIS B2808-1990
and
Strength Firmness = 70+/-5 (JIS K 6301)

(I don't have any information on this JIS K 6301 specification.  Could anyone enlighten me?)

RE: Question on Calculating Force on a Roll Pin

Downward force = coefficient of static friction X Spring Force


coefficient of static friction for steel to steel is

.15 to .25

Hope this will help you

RE: Question on Calculating Force on a Roll Pin

(OP)
Ok, Not sure I stated the problem propperly.

The plastic body that the roll pin gets pushed into has a smaller diameter hole then the OD of the Roll pin.

I am trying to see the stress in the plastic eventually.  But to get there, I need to figure out a way to approximate the force the roll pin exerts on the plastic body when it is inserted.

I think the only thing I can measure is an approximate diameter of the spring pin when inserted.  Use this to approximate the force the pastic sees.

I am not sure how to get a "spring force" from the JIS B2808 or Strength rating of 70 (what unit that is?).

RE: Question on Calculating Force on a Roll Pin

For the stress calculation, you could use a press fit equation, but you would need the stiffness of the pin.  Contact the pin manufacturer.

JIS K 6301 is a standard describing mechanical testing methods.  I believe the Strength Firmness is the double shear strength of the pin in kgf/cm2.

Regards,

Cory

Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips Fora.

RE: Question on Calculating Force on a Roll Pin

(OP)
Thanks.

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!


Resources