<html><body><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_1425777616136_18237" dir="ltr"><span>Thanks Alec,</span></div><div id="yui_3_16_0_1_1425777616136_18237" dir="ltr">The lapping that I saw was by an artist who was joining two peices</div><div id="yui_3_16_0_1_1425777616136_18237" dir="ltr">of marble. It was done by machine & I think he left it going over night.</div><div id="yui_3_16_0_1_1425777616136_18237" dir="ltr">Alan</div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1425777616136_18241"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1425777616136_18240"> <div dir="ltr" id="yui_3_16_0_1_1425777616136_18239"> <hr size="1" id="yui_3_16_0_1_1425777616136_18633"> <font size="2" face="Arial" id="yui_3_16_0_1_1425777616136_18238"> <b><span style="font-weight:bold;">From:</span></b> Alec Smyth 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> Sunday, March 8, 2015 11:32 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Gamma ring machining<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1425777616136_18244"><br><div id="yiv7903471992"><div id="yui_3_16_0_1_1425777616136_18243"><div dir="ltr" id="yui_3_16_0_1_1425777616136_18242">I used to do lapping many, many years ago when I built some plastic injection molds. We lapped on a glass plate because it's smoother than plate steel. You change the glass every so often because as abrades it loses its flatness. There's no trouble knowing if the piece you're lapping is done or if its flat. What happens is that, as you work it, you can see the difference in the surface finish. The new finish gradually spreads across the surface, and when its uniform you know you've got rid of any low points. I really can't imagine lapping something as big as we're talking about here, although I suppose its technically possible. This was really hard work, taking days on end to do a piece that was maybe 6" by 10", tiny compared to what we're talking about here. <div id="yui_3_16_0_1_1425777616136_18752"><br clear="none"></div><div id="yui_3_16_0_1_1425777616136_18753">Greg Cottrell told me he finished his hatch land surface with an angle grinder, using a flap wheel and a lot of patience. It looks like it had been machined.</div><div id="yui_3_16_0_1_1425777616136_18754"><br clear="none"><div id="yui_3_16_0_1_1425777616136_18755"><br clear="none"></div><div id="yui_3_16_0_1_1425777616136_18756">Best,</div><div id="yui_3_16_0_1_1425777616136_18757"><br clear="none">Alec</div></div></div><div class="yiv7903471992gmail_extra"><br clear="none"><div class="yiv7903471992gmail_quote">On Sat, Mar 7, 2015 at 2:09 PM, Alan James via Personal_Submersibles <span dir="ltr"><<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> wrote:<br clear="none"><blockquote class="yiv7903471992gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div class="qtdSeparateBR"><br><br></div><div class="yiv7903471992yqt0029140044" id="yiv7903471992yqt97523"><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"><div dir="ltr"><span>Hank,</span></div><div dir="ltr"><span>had a quick search but couldn't find any suitable lapping</span></div><div dir="ltr"><span>solution for a home builder. There were referances to thick</span></div><div dir="ltr"><span>plate glass with a bonded diamond surface & marble as</span></div><div dir="ltr"><span>lapping plates.</span></div><div dir="ltr"><span>Alan</span></div><br clear="none"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div dir="ltr"> <hr size="1"> <font face="Arial"><span class="yiv7903471992"> <b><span style="font-weight:bold;">From:</span></b> hank pronk 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>><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> Personal Submersibles General Discussion <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"> </span><b><span style="font-weight:bold;">Sent:</span></b> Saturday, March 7, 2015 11:29 PM</font><div><div class="yiv7903471992h5"><br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Gamma ring machining<br clear="none"> </div></div> </div><div><div class="yiv7903471992h5"> <div><br clear="none"><br clear="none">Alan,<br clear="none">I have been told that it would work, but I am not convinced. I would think the machined disk needs to be harder so it does not wear down. Honestly I just don't know. <br clear="none">Hank--------------------------------------------<br clear="none">On Fri, 3/6/15, Alan James 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"> Subject: Re: [PSUBS-MAILIST] Gamma ring machining<br clear="none"> To: "Personal Submersibles General Discussion" <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> Received: Friday, March 6, 2015, 9:30 PM<br clear="none"> <br clear="none"> So<br clear="none"> do you think it would work with a flatsheet<br clear="none"> rotating on your reinforcing ring?I<br clear="none"> had thought of doing this with the hatch & landing,<br clear="none"> toget a<br clear="none"> perfect seal, not sure if I would need an orbital<br clear="none"> motionor<br clear="none"> not.Alan<br clear="none"> <br clear="none"> From: hank pronk via<br clear="none"> Personal_Submersibles<br clear="none"> <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <br clear="none"> To: Personal<br clear="none"> Submersibles General Discussion<br clear="none"> <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"> <br clear="none"> Sent:<br clear="none"> Saturday, March 7, 2015 12:52 PM<br clear="none"> Subject: Re:<br clear="none"> [PSUBS-MAILIST] Gamma ring machining<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> Alan,<br clear="none"> Yes I<br clear="none"> have done lapping in the past. I mostly lap valves in<br clear="none"> engines. It works great on two tapered faces. <br clear="none"> Hank--------------------------------------------<br clear="none"> On Fri, 3/6/15, Alan James via<br clear="none"> 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>><br clear="none"> wrote:<br clear="none"> <br clear="none"> Subject: Re:<br clear="none"> [PSUBS-MAILIST] Gamma ring machining<br clear="none"> To:<br clear="none"> "Personal Submersibles General Discussion" <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> Received: Friday, March 6, 2015, 6:39 PM<br clear="none"> <br clear="none"> Hank,are you<br clear="none"> familiar with lapping?Rubbing<br clear="none"> <br clear="none"> two surfaces together with abrasive paste in<br clear="none"> betweenhttp://<a rel="nofollow" shape="rect" target="_blank" href="http://en.wikipedia.org/wiki/Lapping">en.wikipedia.org/wiki/Lapping</a><br clear="none"> Haven't<br clear="none"> done it but have<br clear="none"> seen it in operation; you can get a very<br clear="none"> <br clear="none"> smoothsurface<br clear="none"> with this technique. Not sure<br clear="none"> if you could adapt it to your<br clear="none"> newflange<br clear="none"> facing machine.The<br clear="none"> machine I<br clear="none"> saw in operation was slow but required very little<br clear="none"> attention.Alan<br clear="none"> <br clear="none"> <br clear="none"> From: hank pronk<br clear="none"> via<br clear="none"> Personal_Submersibles<br clear="none"> <br clear="none"> <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <br clear="none"> To: Personal<br clear="none"> Submersibles General Discussion<br clear="none"> <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <br clear="none"> <br clear="none"> Sent:<br clear="none"> <br clear="none"> Saturday, March 7, 2015 12:18 PM<br clear="none"> Subject:<br clear="none"> Re:<br clear="none"> [PSUBS-MAILIST] Gamma ring machining<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> Steve,<br clear="none"> I am half way done<br clear="none"> <br clear="none"> building my flange facing machine, I should be mostly<br clear="none"> done<br clear="none"> tomorrow. My rig already weighs<br clear="none"> about 700 lbs. I think<br clear="none"> it is important<br clear="none"> that it is heavy and mine is built heavier<br clear="none"> <br clear="none"> than the ones on YouTube. If it fails I can do as you<br clear="none"> mention. I actually did exactly what you say<br clear="none"> on<br clear="none"> Gamma's window frames. I used paint<br clear="none"> and glass with fine<br clear="none"> wet sand paper. I would<br clear="none"> guess the SS ring was much harder<br clear="none"> than the<br clear="none"> 516-70 I have.<br clear="none"> Hank<br clear="none"> <br clear="none"> --------------------------------------------<br clear="none"> On Fri, 3/6/15, Stephen Fordyce via<br clear="none"> 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>><br clear="none"> wrote:<br clear="none"> <br clear="none"> <br clear="none"> Subject: Re:<br clear="none"> [PSUBS-MAILIST] Gamma ring<br clear="none"> machining<br clear="none"> To:<br clear="none"> <br clear="none"> "Personal Submersibles General Discussion" <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> Received: Friday, March 6, 2015, 4:06 PM<br clear="none"> <br clear="none"> Hi Hank,<br clear="none"> <br clear="none"> <br clear="none"> We used<br clear="none"> a flame facing machine recently at<br clear="none"> work to<br clear="none"> do a<br clear="none"> stainless steel flange on a<br clear="none"> pressure vessel about 800mm ID.<br clear="none"> We hired it<br clear="none"> to use<br clear="none"> ourselves at great expense, and the thing<br clear="none"> <br clear="none"> weighed a couple of hundred kilos, was very<br clear="none"> <br clear="none"> solid.<br clear="none"> The fitter who did the job was<br clear="none"> very<br clear="none"> experienced<br clear="none"> <br clear="none"> machinist (but hadn't used<br clear="none"> one before)<br clear="none"> but could not get<br clear="none"> the finish<br clear="none"> very smooth - I can't find photos sorry,<br clear="none"> but<br clear="none"> it was like regular machining grooves<br clear="none"> but much<br clear="none"> larger - and<br clear="none"> it<br clear="none"> looked pretty ordinary. He<br clear="none"> spent several<br clear="none"> hours with a<br clear="none"> grinder cleaning<br clear="none"> it up.<br clear="none"> On balance, it<br clear="none"> probably would have<br clear="none"> been easier<br clear="none"> to just flatten it manually<br clear="none"> <br clear="none"> with a grinder (but it was on a<br clear="none"> live<br clear="none"> liquefied natural gas plant and they don't<br clear="none"> like<br clear="none"> sparks:) ). Wasn't critical to<br clear="none"> get a flat<br clear="none"> face as we<br clear="none"> <br clear="none"> were just making room for a<br clear="none"> gasket in a<br clear="none"> slot to have more<br clear="none"> <br clear="none"> <br clear="none"> compression.<br clear="none"> After getting it pretty<br clear="none"> flat<br clear="none"> with a straight<br clear="none"> <br clear="none"> edge, the fine<br clear="none"> stuff/quality control could<br clear="none"> be done by a thin<br clear="none"> layer of paint on a<br clear="none"> known flat plate or<br clear="none"> machined flange<br clear="none"> which you put on the welded<br clear="none"> <br clear="none"> flange and then where there is<br clear="none"> no<br clear="none"> paint<br clear="none"> deposited, you know that area is too<br clear="none"> low. Obviously<br clear="none"> paint is no good, but<br clear="none"> colored oil or 2-layered<br clear="none"> carbon paper<br clear="none"> (nice because then you have a<br clear="none"> trace of it) would probably<br clear="none"> <br clear="none"> work, or<br clear="none"> charcoal.<br clear="none"> <br clear="none"> Cheers,<br clear="none"> <br clear="none"> Steve<br clear="none"> On 06/03/2015 11:40<br clear="none"> PM,<br clear="none"> "hank pronk via<br clear="none"> <br clear="none"> 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>><br clear="none"> wrote:<br clear="none"> Brian,<br clear="none"> <br clear="none"> No, the machine is<br clear="none"> connected<br clear="none"> to the inside lip of the<br clear="none"> ring. The<br clear="none"> machine rotates<br clear="none"> on a center pivot. The cutter<br clear="none"> rotates<br clear="none"> instead of the part.<br clear="none"> <br clear="none"> <br clear="none"> Hank<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> --------------------------------------------<br clear="none"> <br clear="none"> On Thu, 3/5/15, Brian<br clear="none"> Cox<br clear="none"> 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>><br clear="none"> wrote:<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> Subject: Re:<br clear="none"> [PSUBS-MAILIST] Gamma ring<br clear="none"> machining<br clear="none"> <br clear="none"> To:<br clear="none"> "Personal Submersibles General<br clear="none"> <br clear="none"> Discussion"<br clear="none"> <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <br clear="none"> Received: Thursday,<br clear="none"> March<br clear="none"> 5, 2015, 9:15 PM<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> Hank, are you going to<br clear="none"> be<br clear="none"> <br clear="none"> turning the whole<br clear="none"> fricking sub ?<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> Brian<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> --- <a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br clear="none"> <br clear="none"> wrote:<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> From:<br clear="none"> hank pronk 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>><br clear="none"> <br clear="none"> To: <a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a><br clear="none"> <br clear="none"> Subject:<br clear="none"> [PSUBS-MAILIST]<br clear="none"> Gamma ring machining<br clear="none"> <br clear="none"> <br clear="none"> Date:<br clear="none"> Thu, 5 Mar 2015 18:00:24 -0800<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> Today my<br clear="none"> welder came to my shop and<br clear="none"> welded the<br clear="none"> <br clear="none"> reinforcing<br clear="none"> <br clear="none"> ring into<br clear="none"> Gamma, 10 passes, looks perfect!<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> Next<br clear="none"> step, machine the<br clear="none"> ring. I am going to make a<br clear="none"> <br clear="none"> flange facing machine from<br clear="none"> a one ton truck full<br clear="none"> <br clear="none"> <br clear="none"> floater differential hub<br clear="none"> and a part or two borrowed<br clear="none"> from<br clear="none"> my<br clear="none"> <br clear="none"> <br clear="none"> spare lathe. The rig will be hydraulic<br clear="none"> drive. <br clear="none"> <br clear="none"> This may<br clear="none"> or may not<br clear="none"> work. :-) If it works and<br clear="none"> I<br clear="none"> <br clear="none"> am confident it<br clear="none"> will, I can also face CT<br clear="none"> lands, with the<br clear="none"> CT<br clear="none"> <br clear="none"> <br clear="none"> welded in place.<br clear="none"> <br clear="none"> <br clear="none"> Hank<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> _______________________________________________<br clear="none"> <br clear="none"> <br clear="none"> Personal_Submersibles<br clear="none"> mailing list<br clear="none"> <br clear="none"> <a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"> <br clear="none"> <a rel="nofollow" shape="rect" target="_blank" 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