[PSUBS-MAILIST] Pneumatic Rotary Actuators

[kocpnt tds.net]

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

Best Regards,


Jim K


On Fri, Apr 4, 2014 at 5:10 PM, hank pronk <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> 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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