<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body><div>Hank,</div><div>Do you have any pictures of your manipulator arm?</div><div>Thanks,</div><div>Scott Waters</div><div><br></div><div><br></div><div><br></div><div><br></div><div><div style="font-size:75%;color:#575757">Sent from my U.S. Cellular© Smartphone</div></div> <br>hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br>Alan,<br>The arm is very smooth on Gamma except for the swing. The reason it is smooth is the extreme low flow rate with 1/8in lines. The swing is jerky because the swing cylinder is to short making the swing to fast. I presume in the water it will be a bit better due to water resistance, like an oar on a boat. The valve bank does not need to be near the pilot, Gamma has the valve outside the hull. <br>Hank<br>--------------------------------------------<br>On Thu, 5/29/14, Alan James via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br><br> Subject: Re: [PSUBS-MAILIST] Manipulator arm<br> To: "Personal Submersibles General Discussion" <personal_submersibles@psubs.org><br> Received: Thursday, May 29, 2014, 5:18 PM<br> <br> Hank,Firstly I'm just learning<br> about this stuff.I<br> came across these control valves that looked reasonably<br> priced.Directional Hydraulic Control<br> Valves | Hydraulic Control Valves | Hydraulics | Northern<br> Tool + Equipment<br> With the convertible pump idea you<br> would save space around the pilot control area by having<br> small electricswitches instead of large valves, but<br> wouldn't you lose the ability to slow the movement down.<br> It wouldjust be an on / off jerky<br> movement.They do have reasonably<br> priced solenoids on this site with<br> "soft shift" which I presume means a degree<br> ofcontrol rather than<br> full on / full off.http://www.northerntool.com/shop/tools/category_hydraulics+hydraulic-valves+power-solenoid<br> For $139- per degree of movement plus<br> the price of one power unit, (round $500-) you could have<br> electric control.Power<br> units-http://www.northerntool.com/shop/tools/category_hydraulics+hydraulic-power-units<br> Alan Directional<br> Hydraulic Control Valves | Hydraulic<br> Control...Directional Hydraulic Control<br> ValvesView<br> on www.northerntool.comPreview<br> by Yahoo<br> <br> <br> From: Hugh Fulton via<br> Personal_Submersibles<br> <personal_submersibles@psubs.org><br> To: 'Personal<br> Submersibles General Discussion'<br> <personal_submersibles@psubs.org> <br> Sent: Friday, May 30, 2014<br> 8:36 AM<br> Subject: Re:<br> [PSUBS-MAILIST] Manipulator arm<br> <br> Hank,<br> That seems like very good advice. I am<br> wanting to do a manipulator but need<br> to get some idea of what<br> lifting or forces are required.<br> What are the pumps you have<br> found to work best. What pressure do they<br> develop? I had<br> no idea what a top pump was so googled it and came up<br> with<br> breast<br> pumps!! I didn't want to make a tit of myself so chased<br> down some<br> more and found that they are for convertible cars.<br> They look a bit on the<br> large side diameter wise. Any brand<br> best? Cheers, Hugh <br> <br> <br> -----Original Message-----<br> From:<br> Personal_Submersibles [mailto:personal_submersibles-bounces@psubs.org]<br> On Behalf Of<br> hank pronk via Personal_Submersibles<br> Sent: Friday, 30 May 2014<br> 12:21 a.m.<br> To: Personal Submersibles General Discussion<br> Subject: Re:<br> [PSUBS-MAILIST] Manipulator arm<br> <br> Scott,<br> No matter how you do it, a<br> manipulator will cost some of money. I have made<br> many and the<br> tendency seems to be, to try and make them strong to lift<br> a<br> lot. <br> Well first off, I think it was Vance that said it<br> best. A manipulator<br> is for<br> manipulating not lifting. With that in mind, large<br> components are<br> not needed. Simple air cylinders from ebay<br> are all that is needed. A 2in<br> bore and depending on manip<br> design, 4in stroke, maybe as much as 6in stroke<br> is all you<br> need. Keep the rod size small at 5/8, that reduces the<br> back<br> pressure. I have said it before, I love<br> convertible top pumps. Consider<br> using one pump per function<br> again purchase from ebay for 125 bucks. No need<br> for valves, the<br> pump simply runs in reverse to change direction of the<br> piston. Keep the<br> pumps inside the sub and it is real simple. As for the<br> arm<br> itself,<br> if have made them from cardboard first. You<br> can mock it up that way<br> and find the best pin<br> locations for the cylinders and ensure the <br> cylinders<br> stroke properly without over centering. You can<br> build the arm with square<br> tubing, use 3 inch aluminum<br> so the cylinders fit inside when the arm is<br> folded up. Forget about<br> a wrist until you have lots of time to play around.<br> Four functions<br> will serve a psubber well and can be built for under<br> 1,000<br> dollars. I can send you a convertible top pump to<br> play with if you like.<br> Hank<br> --------------------------------------------<br> On Wed, 5/28/14,<br> swaters via Personal_Submersibles<br> <personal_submersibles@psubs.org> wrote:<br> <br> Subject: [PSUBS-MAILIST]<br> Manipulator arm<br> To: personal_submersibles@psubs.org<br> Received: Wednesday, May 28,<br> 2014, 9:31 PM<br> <br> <br> Hey guys. I am<br> still working on the manipulator arm project for<br> the K boats. I am a<br> little overwhelmed as to what<br> direction to head. I really don't know where<br> to start because<br> of my lack of knolwedge. Does anyone have any<br> pointers as<br> to where to start? I am thinking about using<br> electric motors rather than<br> hydrolics just because of the<br> amount of external operating<br> peices. Thanks,Scott Waters<br> <br> <br> <br> Sent<br> from my U.S.<br> Cellular© Smartphone<br> <br> <br> -----Inline Attachment Follows-----<br> <br> <br> _______________________________________________<br> <br> Personal_Submersibles mailing list<br> Personal_Submersibles@psubs.org<br> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<br> <br> <br> _______________________________________________<br> Personal_Submersibles mailing list<br> Personal_Submersibles@psubs.org<br> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<br> <br> <br> __________<br> Information from ESET NOD32 Antivirus, version of virus<br> signature<br> database 9862 (20140528) __________<br> <br> The message was checked by<br> ESET NOD32 Antivirus.<br> <br> http://www.eset.com<br> <br> <br> <br> __________ Information from<br> ESET NOD32 Antivirus, version of virus signature<br> database 9862<br> (20140528) __________<br> <br> The<br> message was checked by ESET NOD32 Antivirus.<br> <br> http://www.eset.com<br> <br> <br> <br> _______________________________________________<br> Personal_Submersibles mailing list<br> Personal_Submersibles@psubs.org<br> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<br> <br> <br> <br> -----Inline Attachment Follows-----<br> <br> _______________________________________________<br> Personal_Submersibles mailing list<br> Personal_Submersibles@psubs.org<br> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<br> <br><br>_______________________________________________<br>Personal_Submersibles mailing list<br>Personal_Submersibles@psubs.org<br>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles<br><br></body>