<div dir="ltr">Hi Alan,<div><br></div><div>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.</div>
<div><br></div><div>You can find some examples at <a href="http://www.surpluscenter.com">www.surpluscenter.com</a></div><div><br></div><div>Best Regards,</div><div><br></div><div><br></div><div>Jim K</div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Fri, Apr 4, 2014 at 5:10 PM, hank pronk <span dir="ltr"><<a href="mailto:hanker_20032000@yahoo.ca" target="_blank">hanker_20032000@yahoo.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div style="font-size:12pt;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif"><div><span>Alan, </span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif">
<span>you can rotate 180 degrees with a single air cylinder and a watts link.</span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif">
<span>No need for an actuator</span></div><div style="font-style:normal;font-size:16px;background-color:transparent;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif"><span>Hank</span></div>
<div style="display:block"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:12pt"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:12pt">
<div><div class="h5"> <div dir="ltr"> <font face="Arial"> On Friday, April 4, 2014 4:04:18 PM, Alan James <<a href="mailto:alanlindsayjames@yahoo.com" target="_blank">alanlindsayjames@yahoo.com</a>> wrote:<br> </font> </div>
  </div></div><div><div><div class="h5"><div><div><div style="font-size:14pt;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif"><div>Hi, </div><div>I'm wondering if anyone has had any experience with either pneumatic</div>
<div>rack & pinion actuators, or rotary vane actuators, operating underwater.</div><div>I need to rotate something through 180 degrees & have it held with a bit</div><div>of clamping pressure at one <span style="font-size:14pt">end of the motion.</span></div>
<div style="font-style:normal;font-size:14pt;background-color:transparent;font-family:HelveticaNeue,"Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif"><span style="font-size:14pt">One concern is seawater getting in to the gearing of those items, & there reliability. </span></div>
<div style="font-style:normal;font-size:14pt;background-color:transparent;font-family:HelveticaNeue,"Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif"><span style="font-size:14pt">Another option, could be a normal pneumatic cylinder with an external</span></div>
<div style="font-style:normal;font-size:14pt;background-color:transparent;font-family:HelveticaNeue,"Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif"><span style="font-size:14pt">rack & pinion added. Am trying not to
 have to go to hydraulics.</span></div><div style="font-style:normal;font-size:14pt;background-color:transparent;font-family:HelveticaNeue,"Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif">
<span style="font-size:14pt">Alan</span></div></div></div></div><br></div></div>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br>
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<br></blockquote></div><br></div>