×
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

Serration pitch plane

Serration pitch plane

Serration pitch plane

(OP)
Does anyone know the definition of a pith plane if the serrations on a part are raidial or perpendicular to a axis diameter?

RE: Serration pitch plane

The pitch plane is the perfect circle extended in the Z direction.  The pitch plane or pitch circle is generally where the space equals the thickness much like a gear or
spline tooth pitch circle.  Not certain if this is what you
are asking about.

RE: Serration pitch plane

(OP)
The serrations I am dealing with are on the ends of a shaft with the tooth direction running perpendicular to the axis of the shaft in much the same way if the ends were threaded.  There is a callout on the drawing requiring the pitch planes to be coincident within .002 tir.  I am having a hard time visualizing the pitch plane.  I think they want the splines to be coincident, but I am curious about what the pitch plane actually means.

RE: Serration pitch plane

Are these serrations for a belt drive?
O-ring grooves?

RE: Serration pitch plane

(OP)
These are serrations similar to spline teeth.  They are not designed for dynamic operation such as spur, bevel, or worm gears.  They operate in static ie to prevent rotation or sliding action with a mating part.  They are often used in parts that have slots for fastener holes and fix to a mating part allowing fine adjustment at assembly.  My part has serrations about 120 deg around the circumference at each end.  It is called a link so I'm speculating the serrations adjust length in the linkage.

RE: Serration pitch plane

So is it really a screw thread to reduce
axial clearance?  I have seen this used
in some bearing arrangements where preload
needed to be controlled rather closely.

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