<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body ><div>Alan, </div><div>I looked into air, but it presents some problems. One is compensating it otherwise you will get less preformance based on depth. Two is they are not as stiff and have give as well as less fine control. Also another problem is if you used compressed air, you have a limiting factor or you could use a compressor, but have to have a bank to draw from.</div><div>The main draw back of hydraulic for me was the mess and polution factor. Otherwise, hydraulic seems to be the way to go.</div><div>I am hoping to come up with a manipulator design that can be used on most psubs that is easy and affordable.</div><div>Thanks,</div><div>Scott Waters</div><div><br></div><div><br></div><div><div style="font-size:9px;color:#575757">Sent from my U.S. Cellular® Smartphone</div></div><div></div><br><br>-------- Original message --------<br>From: Alan James via Personal_Submersibles <personal_submersibles@psubs.org> <br>Date:02/11/2015 12:52 PM (GMT-06:00) <br>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br>Cc: <br>Subject: Re: [PSUBS-MAILIST] Manipulator <br><br><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1423679966068_5094" dir="ltr"><span>Hank,</span></div><div id="yui_3_16_0_1_1423679966068_5094" dir="ltr"><span id="yui_3_16_0_1_1423679966068_5204">why not just use air if the pneumatic cylinders are rated for 150 psi.</span></div><div id="yui_3_16_0_1_1423679966068_5094" dir="ltr"><span id="yui_3_16_0_1_1423679966068_5143">If they are rated for 150 psi it would be assumed that their mechanical strength</span></div><div id="yui_3_16_0_1_1423679966068_5094" dir="ltr"><span id="yui_3_16_0_1_1423679966068_5210">would match the load they can lift with 150 psi also.</span></div><div id="yui_3_16_0_1_1423679966068_5094" dir="ltr"><span id="yui_3_16_0_1_1423679966068_5211">Is there any advantage other than the o ring working both ways to stop water</span></div><div id="yui_3_16_0_1_1423679966068_5094" dir="ltr"><span id="yui_3_16_0_1_1423679966068_5212">ingress, as you have said previously. Does anyone else use them in place</span></div><div id="yui_3_16_0_1_1423679966068_5094" dir="ltr"><span>of hydraulic cylinders?</span></div><div id="yui_3_16_0_1_1423679966068_5094" dir="ltr"><span>Alan</span></div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1423679966068_5089"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1423679966068_5088"> <div dir="ltr" id="yui_3_16_0_1_1423679966068_5087"> <hr size="1" id="yui_3_16_0_1_1423679966068_5235"> <font size="2" face="Arial" id="yui_3_16_0_1_1423679966068_5086"> <b><span style="font-weight:bold;">From:</span></b> hank pronk via Personal_Submersibles <personal_submersibles@psubs.org><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> Thursday, February 12, 2015 7:21 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Manipulator<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1423679966068_5090"><br><br>No problems, Gamma has air cylinders and at 1,000 feet the hydraulic pump is set at 1,100 psi. Your K sub can have a pressure setting of 500 or less and work just fine. Remember, your not lifting a lot just the arm plus a bit.<br>Hank--------------------------------------------<br>On Wed, 2/11/15, <a ymailto="mailto:swaters@waters-ks.com" href="mailto:swaters@waters-ks.com" id="yui_3_16_0_1_1423679966068_5093">swaters@waters-ks.com</a> via Personal_Submersibles <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br> Subject: Re: [PSUBS-MAILIST] Manipulator<br> To: "Personal Submersibles General Discussion" <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br> Received: Wednesday, February 11, 2015, 12:23 PM<br> <br> Do you<br> have any problem with over pressure though? The pnuematic<br> cylinders are rated to 150psi with air and 1000 psi with<br> oil. Thanks,Scott<br> Waters<br> <br> Sent from my U.S.<br> Cellular® Smartphone<br> <br> -------- Original message<br> --------<br> From: hank pronk via<br> Personal_Submersibles<br> <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br> Date:02/11/2015 11:12 AM (GMT-06:00) <br> To: personal_submersibles<br> <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br> Cc:<br> <br> Subject: Re: [PSUBS-MAILIST] Manipulator<br> <br> <br> hi Scott<br> use a<br> hydraulic pump just the same as if you used hydraulic<br> cylinders<br> Hank <br> <br> <br> <br> <br> <br> <br> <br> <br> From:<br> <br> <a ymailto="mailto:swaters@waters-ks.com" href="mailto:swaters@waters-ks.com">swaters@waters-ks.com</a> via<br> Personal_Submersibles<br> <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>; <br> <br> <br> <br> To:<br> <br> psubs<br> <<a ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>; <br> <br> <br> <br> Subject:<br> <br> [PSUBS-MAILIST] Manipulator <br> <br> <br> <br> Sent:<br> <br> Wed, Feb 11, 2015 3:39:07 PM <br> <br> <br> <br> <br> <br> Hank,I know you<br> said to use pnumatic cylinders for the manipulator arm.<br> What kind of pump do you<br> use?Thanks,Scott Waters<br> <br> Sent from my U.S.<br> Cellular®<br> Smartphone<br> <br> <br> <br> <br> -----Inline Attachment Follows-----<br> <br> _______________________________________________<br> Personal_Submersibles mailing list<br> <a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br> <a 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>_______________________________________________<br>Personal_Submersibles mailing list<br><a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br></div> </div> </div> </div></body></html>