Hi Ron
Sounds like a god and permanent way to solve that problem!
Regards Gert
Den 27/08/2006 kl. 6.14 skrev <rparigor@suffolk.lib.ny.us>:
>
> Hello Gert
>
> "I am interested in comments from folks who have done this mod. the
> Europa
> way to hear from their experience."
>
> YIKES
>
> My kit A-265 came through with 3/8 pins. The holes were trilobal, 2
> of the
> pins dropped in by hand, the other 2 way too loose.
>
> Andy sent me 3/8" pins .001" oversized. Not even close to resolve.
>
> Next he sent me 10mm reamer and 4 10mm pins. Better but it is a new
> build
> and there was play 1/2 way towards unacceptable. The reamer cut a
> little
> oversized and the pin sizes were not too precise.
>
> That was Factory resolve which would have no way lasted very long.
> Factory
> went out of business shortly there after.
>
> In less than thousands of words, I made a plastic fixture to hold
> things
> solid in my Bridgeport milling machine. Snuck up on holes with a
> reamer,
> then a second one a few thousands over the first. Plenty of cutting
> fluid.
> I then machined a pin out of 416 Stainless Steel. Used precision
> pins to
> measure hole, and hand lapped .0008" oversized. Pretty good but fit
> was
> still not to my liking!
>
> Ends up that although when you ream a hole, you can measure a size,
> if you
> look at it under a microscope, it is not too close to smooth. I
> then made
> a series of pins in .0001" increments. Then I forced them 1 at a time
> till I could feel a good amount of resistance. Once you get to this
> resistance point, going larger does not change hole size. I will
> call this
> burnishing. After burnishing I measured holes, and made pins
> oversized.
> Not a trivial job making a pin holding tolerance to ~ .0002". Turn
> just a
> little over, then hand lap to precise size. I also lapped the
> center of
> pins a thousand or 2 undersized so the first hole would get minimal
> damage.
>
> Absolute no play, and I am pretty certain this is a permanent
> repair. Pin
> size was a little over .400" which was OKed by Andy.
>
> Ron Parigoris
>
>
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