[PSUBS-MAILIST] Pneumatic Rotary Actuators

[Alan James]

Hi Hank,
my problem is that I need to have a holding force at the end of
the 180 degrees of rotation at one end, & I can't see any simple linkage that will do it.
Alan


________________________________
 From: hank pronk <hanker_20032000 at yahoo.ca>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Saturday, April 5, 2014 11:10 AM
Subject: Re: [PSUBS-MAILIST] Pneumatic Rotary Actuators
 


Alan, 
you can rotate 180 degrees with a single air cylinder and a watts link.
No need for an actuator
Hank
On Friday, April 4, 2014 4:04:18 PM, Alan James <alanlindsayjames at yahoo.com> wrote:
 
Hi, 
I'm wondering if anyone has had any experience with either pneumatic
rack & pinion actuators, or rotary vane actuators, operating underwater.
I need to rotate something through 180 degrees & have it held with a bit
of clamping pressure at one end of the motion.
One concern is seawater getting in to the gearing of those items, & there reliability. 
Another option, could be a normal pneumatic cylinder with an external
rack & pinion added. Am trying not to have to go to hydraulics.
Alan
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