<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:14pt"><div><span>Hi Hank,</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span>my problem is that I need to have a holding force at the end of</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span>the 180 degrees of rotation at one end, & I can't see any simple linkage that will do it.</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;
background-color: transparent; font-style: normal;"><span>Alan</span></div><div><br></div> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 14pt;"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">From:</span></b> hank pronk <hanker_20032000@yahoo.ca><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, April 5, 2014 11:10 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Pneumatic Rotary Actuators<br> </font> </div> <div class="y_msg_container"><br><div id="yiv2196540282"><div><div style="color: rgb(0, 0, 0); background-color:
rgb(255, 255, 255); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"><div><span>Alan, </span></div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 16px; font-style: normal; background-color: transparent;"><span>you can rotate 180 degrees with a single air cylinder and a watts link.</span></div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 16px; font-style: normal; background-color: transparent;"><span>No need for an actuator</span></div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 16px; font-style: normal; background-color: transparent;"><span>Hank</span></div><div class="yiv2196540282yahoo_quoted" 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 class="yiv2196540282yqt1335717211" id="yiv2196540282yqt13169"><div dir="ltr"> <font face="Arial" size="2"> On Friday, April 4, 2014 4:04:18 PM, Alan James <alanlindsayjames@yahoo.com> wrote:<br clear="none"> </font> </div> <div class="yiv2196540282y_msg_container"><div id="yiv2196540282"><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 14pt; background-color: rgb(255, 255, 255);"><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="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span style="font-size:14pt;">One concern is seawater getting in to the gearing of those items, & there reliability. </span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span style="font-size:14pt;">Another option, could be a normal pneumatic cylinder with an external</span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span style="font-size:14pt;">rack & pinion added. Am trying not to
have to go to hydraulics.</span></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue,;"><span style="font-size:14pt;">Alan</span></div></div></div></div><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"><br clear="none"><br clear="none"></div></div> </div> </div> </div> </div></div></div><br><div class="yqt1335717211" id="yqt41894">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect"
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