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


Linear Actuator remote location

Linear Actuator remote location

Linear Actuator remote location

Hey all, I am trying to build a scotch yoke system with multiple sliders positioned along a single rocker arm. The issue that I am running into is finding a good way to elongate my electric solenoid shaft.

I can get a solenoid that will give me more than enough stroke length to rotate the cranks where I need them, but I would like to hook up multiple cranks to this system and have it span about a 1.5 foot length. Any suggestions on a reliable way to attach a longer shaft to the end of a linear solenoid would be greatly appreciated.

I have thought about adhesives, threading both components, and clamping the longer rod on, but I have no idea which will hold up to loads the best and take the least amount of effort.


RE: Linear Actuator remote location

Replace the existing shaft with a new, longer shaft?

RE: Linear Actuator remote location

Be aware that substantially increasing the solenoid plunger's mass will affect the solenoid's performance.

For a simple tubular solenoid, you don't need anything real fancy; low alloy steel, shaped like the OEM solenoid plunger, annealed and nickel plated, should be sufficient.

Mike Halloran
Pembroke Pines, FL, USA

RE: Linear Actuator remote location

I hope this isn't an AC solenoid your using. If it is, make sure you realize it has a duty cycle. None will take continuous cycling.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Linear Actuator remote location

I should mention that solenoids don't normally do well, actuating multiple anythings, or holding against a load.
You haven't given enough detail to assess whether a solenoid actually is a good choice.
At some levels of mass, a number so far not in evidence, other alternatives exist, e.g. door lock motors.

Mike Halloran
Pembroke Pines, FL, USA

RE: Linear Actuator remote location

I didn't know how complicated it would be to install a new shaft in the solenoid, so if it doesn't require much more than basic tools, that is a definite possibility.

@ itsmoked: I will be using an AC solenoid, but the duty cycle shouldn't be an issue. Thanks for the heads up on that though.

I also just looked into the car door lock actuators, and those seem like a pretty decent alternative. Any idea what sort of stroke length I can get out of a standard one? Also how well would they hold up to the load of an elongated shaft?

RE: Linear Actuator remote location

Don't make the solenoid body hold up the load. Fahgettabloutit. Support the shaft with an external bushing held in some sort of pillow block.

Keith Cress
kcress - http://www.flaminsystems.com

RE: Linear Actuator remote location

The car door lock actuators are probably not going to like moving some big shaft with a bunch of selector forks. ... nor will any other kind of solenoid.

The door lock actuators are well adapted to running exactly one thing.
So use a bunch of them and forget the mechanical selector mechanism.

Mike Halloran
Pembroke Pines, FL, USA

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!


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