[Vwdiesel] Help - messed in the head...

[James Hansen]

material coming off the precups, even though they do it wet. He said a
mirror smooth finish would require their diamond cutter, and the
precups will destroy the cutter (is this true?
_______

Diamond cutters detest interrupted cuts, which this more or less is.  They
make an expensive poof!
I have seen with my own two eyes a CBN (cubic boron nitride) insert cutter
doing a surface finish that had barely perceptable swirl from the fly
cutter.  Swirl, not grooves.
That should be reproduceable by any shop.  Has a lot to do with feed rate,
cutter speed, sharpness of insert, and depth of cut.  In short, experience.
-james




 I though diamond was
pretty hard...). He assured me they have not had any problems with
VW diesels heads done like this.
He also said the cracked precup was not a problem, and that
replacing & machining one to fit would be 1.5 hours. He says they
often are cracked, and do not cause a problem.
I will try to pick it up later today and take some pics.

On the plus side, the welding job they did on the coolant cavity
appears excellent - I had a hard time even spotting it.


-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Shawn Wright, I.T. Manager
Shawnigan Lake School
http://www.sls.bc.ca
swright at sls.bc.ca


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