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<div class="moz-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>
<br>
Sean<br>
<br>
<br>
On 2014-04-05 13:39, Alan James wrote:<br>
</div>
<blockquote
cite="mid:1396726785.70234.YahooMailNeo@web120905.mail.ne1.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff;
font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial,
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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>
<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 face="Arial" size="2"> <b><span
style="font-weight:bold;">From:</span></b>
<a class="moz-txt-link-rfc2396E" href="mailto:JimToddPsub@aol.com">"JimToddPsub@aol.com"</a> <a class="moz-txt-link-rfc2396E" href="mailto:JimToddPsub@aol.com"><JimToddPsub@aol.com></a><br>
<b><span style="font-weight: bold;">To:</span></b>
<a class="moz-txt-link-abbreviated" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> <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" 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 class="moz-txt-link-abbreviated" 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
moz-do-not-send="true" 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 moz-do-not-send="true"
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
moz-do-not-send="true"
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>
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