[PSUBS-MAILIST] Pneumatic Rotary Actuators

[JimToddPsub at aol.com]

Hi Alan,
Could you use a sealed-unit worm gear operated by a small  electric motor?  
That would hold at 180 degrees or any  other position you desire.
Jim
 
 
In a message dated 4/5/2014 8:13:43 A.M. Central Daylight Time,  
kocpnt at tds.net writes:

Hi Alan,  


If you use a thru hull, a linear actuator working at 12, 24 or 36 volts  
works well as well as giving more positive locations than air. They are simple 
 and robust however slower than an air cylinder.


You can find some examples at _www.surpluscenter.com_ 
(http://www.surpluscenter.com/) 


Best Regards,




Jim K



On Fri, Apr 4, 2014 at 5:10 PM, hank pronk <_hanker_20032000 at yahoo.ca_ 
(mailto:hanker_20032000 at yahoo.ca) > wrote:


 
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_ (mailto: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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