<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>Thanks Sean,</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>sounds a good idea, I will look in to it a bit more.</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 style="background-color: transparent;">I'm not against hydraulics, but with a ready sauce of energy in compressed air, I will save space, </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 style="background-color: transparent;">complexity & limit noise </span><span style="background-color: transparent;">by going with pneumatics over hydraulics. </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 style="background-color: transparent;">The sub is for recreational purposes to 500 ft.</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 style="background-color: transparent;">Regards 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> Sean T. Stevenson <cast55@telus.net><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> Monday, April 7, 2014 1:41 PM<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="yiv4380138669"><div>
    <div class="yiv4380138669moz-cite-prefix">I have built manipulators in the past
      using a small hydraulic motor to rotate the inner half of a
      hydraulic slip ring, (outer half, motor and arm structure all
      attached) with manipulator jaws attached that were actuated
      hydraulically through the slip ring.  Not sure why you're against
      hydraulics, but there's no reason you couldn't do the same thing
      with an electric stepper motor and pneumatic actuation.<br clear="none">
      <br clear="none">
      Sean<br clear="none">
      <br clear="none">
      <div class="yiv4380138669yqt9810352304" id="yiv4380138669yqtfd69477"><br clear="none">
      On 2014-04-05 13:39, Alan James wrote:<br clear="none">
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        <div><span>Thanks Jim K & T,</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;">thats got me re-thinking
          things. I might be better to rotate via an electric</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;">motor inside the hull &
          hold with pneumatics outside. I've got an idea those</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;">rotary actuators are
          expensive.</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;">Alan </div>
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            <div dir="ltr">
              <hr size="1"> <font face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b>
                <a rel="nofollow" shape="rect" class="yiv4380138669moz-txt-link-rfc2396E" ymailto="mailto:JimToddPsub@aol.com" target="_blank" href="mailto:JimToddPsub@aol.com">"JimToddPsub@aol.com"</a> <a rel="nofollow" shape="rect" class="yiv4380138669moz-txt-link-rfc2396E" ymailto="mailto:JimToddPsub@aol.com" target="_blank" href="mailto:JimToddPsub@aol.com"><JimToddPsub@aol.com></a><br clear="none">
                <b><span style="font-weight:bold;">To:</span></b>
                <a rel="nofollow" shape="rect" class="yiv4380138669moz-txt-link-abbreviated" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> <br clear="none">
                <b><span style="font-weight:bold;">Sent:</span></b>
                Sunday, April 6, 2014 2:43 AM<br clear="none">
                <b><span style="font-weight:bold;">Subject:</span></b>
                Re: [PSUBS-MAILIST] Pneumatic Rotary Actuators<br clear="none">
              </font> </div>
            <div class="yiv4380138669y_msg_container"><br clear="none">
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                <div><font id="yiv4380138669role_document" color="#000000" face="Arial" size="2">
                  </font>
                  <div><font size="3">Hi Alan,</font></div>
                  <div><font size="3">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.</font></div>
                  <div><font size="3">Jim</font></div>
                  <div> </div>
                  <div>
                    <div>In a message dated 4/5/2014 8:13:43 A.M.
                      Central Daylight Time, <a rel="nofollow" shape="rect" class="yiv4380138669moz-txt-link-abbreviated" ymailto="mailto:kocpnt@tds.net" target="_blank" href="mailto:kocpnt@tds.net">kocpnt@tds.net</a> writes:</div>
                    <blockquote style="PADDING-LEFT:5px;MARGIN-LEFT:5px;BORDER-LEFT:blue 2px solid;"><font style="BACKGROUND-COLOR:transparent;" color="#000000" face="Arial" size="2"> </font>
                      <div dir="ltr">Hi Alan,
                        <div><br clear="none">
                        </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 clear="none">
                        </div>
                        <div>You can find some examples at <a rel="nofollow" shape="rect" title="http://www.surpluscenter.com/" target="_blank" href="http://www.surpluscenter.com/">www.surpluscenter.com</a></div>
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                        <div>Best Regards,</div>
                        <div><br clear="none">
                        </div>
                        <div><br clear="none">
                        </div>
                        <div>Jim K</div>
                      </div>
                      <div class="yiv4380138669gmail_extra"><br clear="none">
                        <br clear="none">
                        <div class="yiv4380138669gmail_quote">On Fri,
                          Apr 4, 2014 at 5:10 PM, hank pronk <span dir="ltr"><<a rel="nofollow" shape="rect" title="mailto:hanker_20032000@yahoo.ca" ymailto="mailto:hanker_20032000@yahoo.ca" target="_blank" href="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>></span>
                          wrote:<br clear="none">
                          <blockquote class="yiv4380138669gmail_quote" style="PADDING-LEFT:1ex;MARGIN:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid;">
                            <div class="yiv4380138669yqt8456284602" id="yiv4380138669yqt56337">
                              <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-size: 16px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; 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="font-size: 16px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>No
                                      need for an actuator</span></div>
                                  <div style="font-size: 16px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-style: normal; background-color: transparent;"><span>Hank</span></div>
                                  <div style="DISPLAY:block;">
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                                        <div>
                                          <div class="yiv4380138669h5">
                                            <div dir="ltr"><font face="Arial">On Friday,
                                                April 4, 2014 4:04:18
                                                PM, Alan James <<a rel="nofollow" shape="rect" title="mailto:alanlindsayjames@yahoo.com" ymailto="mailto:alanlindsayjames@yahoo.com" target="_blank" href="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a>>
                                                wrote:<br clear="none">
                                              </font></div>
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                                          <div>
                                            <div class="yiv4380138669h5">
                                              <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-SIZE:14pt;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="FONT-SIZE:14pt;FONT-FAMILY:HelveticaNeue,;"><span style="FONT-SIZE:14pt;">Another option, could be a normal pneumatic
                                                        cylinder with an
                                                        external</span></div>
                                                    <div style="FONT-SIZE:14pt;FONT-FAMILY:HelveticaNeue,;"><span style="FONT-SIZE:14pt;">rack & pinion added. Am trying not to have
                                                        to go to
                                                        hydraulics.</span></div>
                                                    <div style="FONT-SIZE:14pt;FONT-FAMILY:HelveticaNeue,;"><span style="FONT-SIZE:14pt;">Alan</span></div>
                                                  </div>
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                          </blockquote>
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