<html><head></head><body><div class="ydpe24896f2yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div></div>
<div dir="ltr" data-setdir="false">Alan, </div><div dir="ltr" data-setdir="false"> The actuators have an over-ride mechanism so at the end of the stroke the motor free wheels.</div><div dir="ltr" data-setdir="false">Also I found a way to drill oil or air passages to ensure all cavities including the rod thread area get filled.</div><div dir="ltr" data-setdir="false">These actuators were meant to be on arms under water ;-)</div><div dir="ltr" data-setdir="false">They are perfect, plus Alec changed my design a bit to allow for a less expensive, shorter stroke </div><div dir="ltr" data-setdir="false">actuator to be used on the swing. Also Alec has his air filled, so the motor performance should be unaffected. So far I have had my arm working with David at 200 plus feet with no issues. I noticed that Alecs arm sounds less smooth on air than my arm on oil.</div><div dir="ltr" data-setdir="false">I would say if you can manage to have an air comp system, that would be better than oil.</div><div dir="ltr" data-setdir="false">Hank</div><div><br></div>
</div><div id="yahoo_quoted_1084214147" class="yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
<div>
On Tuesday, September 22, 2020, 3:23:32 PM MDT, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id="yiv6666495214"><div><div></div><div>Alec & Hank,</div><div>when I was compensating linear actuators ( a long time ago ) mine had</div><div>micro switches in them that stopped the travel.</div><div>I am not sure whether the Lenco has them or not!</div><div>I was sticking a hot needle through the plastic housing of the micro switch to</div><div>help compensate them, as it was pretty well sealed & I feared it would randomly</div><div>be switched because of the oil compensation pressure at depth.</div><div>Also the brushed motors were sealed. This again may be a problem if the </div><div>compensating oil hasn't fully filled the cavities inside the motor housing &</div><div>suddenly experiences pressure as you descend. The small brushed motors</div><div>can have what Phil describes as a "herky jerky" action when oil compensated</div><div>due to the oil lifting the brushes off as they spin fast.</div><div>Mentioning this in case you encounter problems operating them at depth!</div><div>Alan</div><div class="yiv6666495214yqt5694335640" id="yiv6666495214yqt64662"><div><br clear="none">On 4/09/2020, at 9:59 AM, Alec Smyth via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div dir="ltr">Hi friends,<div><br clear="none"></div><div><span style="color:rgb(29,33,41);font-family:Helvetica, Arial, sans-serif;font-size:14px;white-space:pre-wrap;">The PSUBS Community Projects page (</span><a rel="nofollow" shape="rect" target="_blank" href="https://l.facebook.com/l.php?u=http%3A%2F%2Fwww.psubs.org%2Fcommunity%2Fprojects%2F%3Ffbclid%3DIwAR0h2tBfXPDrd1-qg5NcZGBCqXXe-SKQZMxFCDCBBtSNnaZx42iOOmuBdoc&h=AT3eqKa9glmfxaDQHOwwOXbznLIfHpxLe5qW-frl6GayEG2OzsaSaxmS_Lvj8sXs-zLUYglsW2tGlIPlmjmFChFQaJrsRSDyDSjP67nMCWAbJVXw5DZhN8Yvuy2Lo7fTILWUn7Zl_yu7bz745aO0H2hQ8vlO11fvzI6KwLZjoR3NwjUToX81HiSAaM1PZIXKrGrmU052uyrhlWmYSJvAuvs6-p6qLb1DUxTxVjW3bV4I6um6t4a5ug0bACMZ6jRKmjrNrd2v8l_3IpweTripbVuMdD8-Tc2exR8k4WwugJbNH1vY0vmMP-uhazz1sbpYLw9mAmjxHGux3_adPYa01oDxd8JWplw5ucnC9jWUhQI-5XlHQzPGSFeYRl2u5QAGl8p_K2Fllv8DobTp1wUCZ-TrgDFKgeiAscI18UrCE60RnkfHK8al3tGWM4ZnQ-P_vS02FdO4qiC5gReo23KUQ0yrJoUn5iNnF24W07kMUkDpp4JLTdT-WODzylg-xWTxnsScWBnllTV7BkUe3QwkIq_1NHXX9QPl6kmaL8b4QpNb1KtjXN3oLdkiC3JN0B3TAch0mA3yRZaEsJSG07y8j6RemPfbNs0-LHZh5j4EK7Sw_j6CWmJwViWoS5TPftPt0tsz7hg" style="color:rgb(56,88,152);text-decoration-line:none;font-family:Helvetica, Arial, sans-serif;font-size:14px;white-space:pre-wrap;">http://www.psubs.org/community/projects/</a><span style="color:rgb(29,33,41);font-family:Helvetica, Arial, sans-serif;font-size:14px;white-space:pre-wrap;"> ) now features an "open source manipulator" developed by Hank Pronk and me. This is an intentionally simple manipulator built using only a drill press and an angle grinder, except for a few plastic bushings that were turned on a lathe for expedience. We purposely avoided things like aluminum welding, to keep it's fabrication as accessible as possible. The page contains blueprints, photos, and a bill of materials - but I recommend beginning at the "Start Here" document in the ZIP file. Please don't hesitate to reach out if you have any questions, or if you have any suggested improvements.</span><br clear="none"></div><div><br clear="none"></div><div>Best,</div><div>Alec</div></div>
</div></blockquote></div><blockquote type="cite"><div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><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></span><br clear="none"></div></blockquote></div></div><div class="yqt5694335640" id="yqt37183">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div>
</div>
</div></body></html>