[PSUBS-MAILIST] taper fit up

[TOM WHENT via Personal_Submersibles]

I wouldn't call 0.003'' difference a failure on a taper with portable machining equipment !


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-------- Original message --------
From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> 
Date: 01-11-2016  8:25 PM  (GMT-05:00) 
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Subject: Re: [PSUBS-MAILIST] taper fit up 

Tom,Very good point, I honestly don't know how accurate it needs to be.  I do not have a good machined fit, the bottom of the hatch is tight and the top has a .003 gap all the way around.  When I started it was the other way around gap at the bottom and tight on top.  I tried three times to match the angles and failed.Hank 

    On Monday, January 11, 2016 6:09 PM, Tom J Whent via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 #yiv9009690774 #yiv9009690774 -- _filtered #yiv9009690774 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv9009690774 {font-family:Wingdings;panose-1:5 0 0 0 0 0 0 0 0 0;} _filtered #yiv9009690774 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv9009690774 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv9009690774 #yiv9009690774 p.yiv9009690774MsoNormal, #yiv9009690774 li.yiv9009690774MsoNormal, #yiv9009690774 div.yiv9009690774MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;}#yiv9009690774 a:link, #yiv9009690774 span.yiv9009690774MsoHyperlink {color:blue;text-decoration:underline;}#yiv9009690774 a:visited, #yiv9009690774 span.yiv9009690774MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv9009690774 span.yiv9009690774EmailStyle17 {color:#1F497D;}#yiv9009690774 .yiv9009690774MsoChpDefault {font-size:10.0pt;} _filtered #yiv9009690774 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv9009690774 div.yiv9009690774WordSection1 {}#yiv9009690774 Indexing was a poor choice of words. Locating would be better – essentially something to keep both base circles concentric for fitting  either for lapping or for mating together in the part’s final configuration. A lot of parts that I might make that have to align well might have a spigot on one half and a mating counterbore on the other.  For lapping, I would think some sort of centerline guide would be useful to keep the two halves in the correct position. Lapping might be overkill? After all it’s not a Swiss watch! If your machined fit is good and you are relying on a captive sealing element like an o-ring – I would  hope you are not going deep enough to extrude it through a 3 thou gap!!! J   I’m sorry if I wasn’t paying very close attention – I’m just lurking on this group and your boring machine really caught my attention. I’m building a non-submersible steel boat (hopefully!) right now and may one day move onto something like this.  Tom      From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Private via Personal_Submersibles
Sent: Monday, January 11, 2016 7:42 PM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] taper fit up  Hank, if you're down to 0.003 isn't it just a matter of putting lapping compound between the hatch and land, and rotating the hatch a bunch of times? I know it's heavy, but maybe with a big lever you can walk around like an 18th century seaman turning a capstan.   Best,  Alec    
On Jan 11, 2016, at 7:01 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Tom,Not sure what you mean about indexing.  My original plan was to use the centre bore for the hatch release as a guide to rotate the hatch over the land with lapping compound.  The problem with that idea is, the hatch has to make a few trips back to lathe and getting it back to the exact location is pretty tough.  Then the centre is off a few thousandths.  I am struggling with the final .003  I can't seem to get it closer.  I think my lathe might be lacking the accuracy.  I know,,,blame the tools ;-)  I need to sleep on it, I have the blueing on the way.  If it was easy, everyone would be doing it.Hank

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