×
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

Ball spline for linear to rotary motion

Ball spline for linear to rotary motion

Ball spline for linear to rotary motion

(OP)
Does anyone know if there is a manufacturer of 'extremely course ball screws'?  Perhaps the device might be considered as a ball spline with twist.

Operationally - Linear motion of the shaft causes the 'block' to rotate.  The desire is that 2" of travel will result in 30-degrees of rotation. It should be a precission device and handle a thrust of approximately 500 lbs.

Thanks.

RE: Ball spline for linear to rotary motion

Back drive a standard ballscrew - I would go with a high lead screw.  Your efficiency drops like a stone but it works.

RE: Ball spline for linear to rotary motion

Pardon the blatant reference to my companies website - but this page has charts of the efficiencies.  I would go with a ground ballscrew myself to keep the motion as smooth as possible to increase the efficiency.

If you think about it - most people test the smoothness of a ballscrew driven actuator by pushing the top table of the actuator long - which is exactly what you are talking about - linear to rotary.  You push the table and it spins the shaft.

Backdrive efficiencies
http://www.thk.com/THKCatalog/THKCat_en/THKD020.html

RE: Ball spline for linear to rotary motion

My memory may be at fault, but I feel certain somebody makes these - I just can't remember who (I've been trying since yesterday). I think we used one at a company I worked at. I thought it was Helac - but their standard ones just use ordinary helical splines.

RE: Ball spline for linear to rotary motion

Further thought : Helac do make a similar device which uses a short planetary roller screw - if that's of any interest. I think that's what it was actually, come to think of it. It's used in robotics etc. But they may have done it with ball screws too if you check with them.

RE: Ball spline for linear to rotary motion

(OP)
ChrisGW  & EnglishMuffin

Thanks for the information

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