×
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

Telescopic Strut.

Telescopic Strut.

Telescopic Strut.

(OP)
I am looking for a telescopic strut for a marine application (think camera tripod or monopod). I need it to collapse to 800mm or less and extend to 1800mm. Max load is 100 kg axial. Problem with available tripods they all seem to have friction locking only. I need positive locking (pins perhaps?) but without backlash (so it needs friction or clamping as well).

The strut will act as one leg of a tripod for towing a sub-surface apparatus. Depth of the apparatus will vary from 600 mm to completely out of the water.

Alternatively a linear actuator (either 12v or manual) that meets the above specs might do the job.

je suis charlie

RE: Telescopic Strut.

I don't like them as mechanisms but crutches are adjustable vis spring loaded pins and of the right load capacity. So you'd need to add a friction clamp to them. You might need to be a bit picky on materials, SS304 is too likely to corrode for use as a sliding tight fit.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?

RE: Telescopic Strut.

There are lead-screw-in-channel types of devices, like this
http://www.ebay.com/itm/Vintage-Tripod-Screw-Bumpe...

Then you could adjust it and and it would stay in place. You could motorize it if you wanted to.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: Telescopic Strut.

gruntguru,

If you absolutely require a reliable friction clamp, you don't need the positive lock, except perhaps as a fail safe device.

Could you use a hydraulic or pneumatic ram extended to solid height?

--
JHG

RE: Telescopic Strut.

Have you looked at a modified adjustable length spinnaker pole?
B.E.

You are judged not by what you know, but by what you can do.

RE: Telescopic Strut.

(OP)
Thanks all.
Greg, I forgot to mention. Length needs to be adjustable in increments of 100mm (4") or less.

je suis charlie

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