[PSUBS-MAILIST] taper fit up

[hank pronk via Personal_Submersibles]

Alec,I think you are right, I am thinking to manually sand down the bottom of the land with wet paper to get it closer then lap in.I already wet sanded the hatch while it spun in the lathe and it is like chrome, it is surprising how close you can get with patience.I did do a test run with lapping compound and it turns okay with a bar, now I need an old donkey to pull it  around all day.  Hmmm bet I can put a hyd motor on itHank 

    On Monday, January 11, 2016 5:42 PM, Private via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 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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