[PSUBS-MAILIST] taper fit up

[Tom J Whent via Personal_Submersibles]

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!!! :) 

 

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 <mailto: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

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org <mailto:Personal_Submersibles at psubs.org> 
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles



---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20160111/80bcbe72/attachment-0001.html>