<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=US-ASCII" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 11.00.9600.16521"></HEAD>
<BODY id=role_body style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; COLOR: #000000"
bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document
color=#000000 size=2 face=Arial>
<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>
<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 title=http://www.surpluscenter.com/
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 title=mailto:hanker_20032000@yahoo.ca
href="mailto:hanker_20032000@yahoo.ca"
target=_blank>hanker_20032000@yahoo.ca</A>></SPAN> wrote:<BR>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<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=h5>
<DIV dir=ltr><FONT face=Arial>On Friday, April 4, 2014 4:04:18 PM, Alan
James <<A title=mailto:alanlindsayjames@yahoo.com
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-SIZE: 14pt; FONT-FAMILY: HelveticaNeue,"Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif; FONT-STYLE: normal; BACKGROUND-COLOR: transparent'><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,"Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif; FONT-STYLE: normal; BACKGROUND-COLOR: transparent'><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,"Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif; FONT-STYLE: normal; BACKGROUND-COLOR: transparent'><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,"Helvetica Neue",Helvetica,Arial,"Lucida Grande",sans-serif; FONT-STYLE: normal; BACKGROUND-COLOR: transparent'><SPAN
style="FONT-SIZE: 14pt">Alan</SPAN></DIV></DIV></DIV></DIV><BR></DIV></DIV>_______________________________________________<BR>Personal_Submersibles
mailing list<BR><A title=mailto:Personal_Submersibles@psubs.org
href="mailto:Personal_Submersibles@psubs.org"
target=_blank>Personal_Submersibles@psubs.org</A><BR><A
title=http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles"
target=_blank>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR><BR><BR></DIV></DIV></DIV></DIV></DIV></DIV><BR>_______________________________________________<BR>Personal_Submersibles
mailing list<BR><A title=mailto:Personal_Submersibles@psubs.org
href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</A><BR><A
title=http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles"
target=_blank>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</A><BR><BR></BLOCKQUOTE></DIV><BR></DIV><BR><BR>_______________________________________________<BR>Personal_Submersibles
mailing
list<BR>Personal_Submersibles@psubs.org<BR>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<BR></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>