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Originally Posted by bfulton620 interseting.......
you speak my language! hell ya! haha... im a quality technician.... measuring machined parts is my life....
starting off.... lets use standard measurments? ....for my sake... tehe...
coversion-
gasket - 0.0435
gap between barrel and head - 0.0420
runnout on your head - 0.0000078701
for starters, the runnout on your head has gota be wrong? otherwise you have some nasa measuring equipment iv never seen...lol... but seriously, how did you measure that?
any chance you can find out what your runnout is on the jug, alone? i would have to agrea that the flatness of the head is well withing a reasonable tolerence, if your measurment was correct? i am however curious how you are measuring the gap between the two? are you using a feeler gauge? if so, and you came up with a varience of 0.042, then the recomended gasket would only allow for 15 ten thousandths of crush. this sounds failry close to what might be required. my guess is, your gona end up with anywhere from 100 psi to 200 psi. the thickness of your desired gasket, should be in direct relation to its durometer. many people think it has to do with surface area... this is not true! ... my machinery standards handbook for list some general gasket information, and notes some rules of thumb. among these rules it states, "The minimum squeeze for all seals, regardless of crosssection should be about .2 mm (.007 inches)". your current gap, and gasket recomendations are withing the, "minumum". do you have a hardness tester for duro at your facility? if so, i should be able to calculate very near the desired thickness of the gasket with this measurment.
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aha u definitely know what im goin on about lol and then some by the sounds of it.
i c ur tlkin in imperial then lol i haaate havin to convert it all the time haha.
well i got the inspector at my work to measure it for me and he did it on something that everyone calls the CMM i think. its attached to a computer and they just touch a little probe on the surfaces and it measures it. i may have read the wrong figure but im pretty sure it was the right one (he did it a few times so i think it averaged the measurements).
i can check out how flat the top of the barrell is on there too but when i put marking blue on it and wipe it on a surface table it seems bang on.
i used the slip gauges in inspection to measure the gap. im right in thinking that its only .0015 that it can squash the gaskets with the measurements i have at the moment? that seems very small to me especially as u say ur handboke says a .007 minimum. i think the head may have been skimmed before and they havent done the spigot in the centre. u've lost me completely on the "hardness tester for duro" bit haha im just a humble miller!
ill try n get some pics on friday because this seems to be rather confusin i might not of explained it too well.
cheeers