<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 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><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> "JimToddPsub@aol.com" <JimToddPsub@aol.com><br> <b><span style="font-weight: bold;">To:</span></b> personal_submersibles@psubs.org <br> <b><span style="font-weight: bold;">Sent:</span></b> Sunday, April 6, 2014 2:43 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="yiv9619450298"><div><font id="yiv9619450298role_document" color="#000000" size="2" face="Arial">
</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,
kocpnt@tds.net writes:</div>
<blockquote style="PADDING-LEFT:5px;MARGIN-LEFT:5px;BORDER-LEFT:blue 2px solid;"><font style="BACKGROUND-COLOR:transparent;" color="#000000" size="2" face="Arial">
</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>
<div><br clear="none"></div>
<div>Best Regards,</div>
<div><br clear="none"></div>
<div><br clear="none"></div>
<div>Jim K</div></div>
<div class="yiv9619450298gmail_extra"><br clear="none"><br clear="none">
<div class="yiv9619450298gmail_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="yiv9619450298gmail_quote" style="PADDING-LEFT:1ex;MARGIN:0px 0px 0px 0.8ex;BORDER-LEFT:#ccc 1px solid;">
<div class="yiv9619450298yqt8456284602" id="yiv9619450298yqt56337"><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;">
<div style="font-size: 12pt; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;">
<div style="font-size: 12pt; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif;">
<div>
<div class="yiv9619450298h5">
<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></div></div>
<div>
<div>
<div class="yiv9619450298h5">
<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></div></div><br clear="none"></div></div>_______________________________________________<br clear="none">Personal_Submersibles
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