hi john a.,
shamefully, it was a long time ago that i changed the oil,
longer than the last time i bought debubblizer, i confess. tho i
live in a very dry climate. but i don't think that the climate
will oil my vacuum pump. do you think the pump is toast or will
flushing it out and changing the oil now do any good? any hope?
this is a 'fast vac' 3cfm. i got a different gauge and it
verifies the reading of 26. i have another vac pump that is a
grange 1/4 horse that i got for 25.00 at a pawn. it gets a
reading of 27. i have no idea of the other specs. is one really
supposed to get a reading of 29? sounds like a dumb question but
i was looking thru the grainger catalog and none of their vac
units say they draw more than 27. i know all the jewelry tool
catalogs say they draw 29, sooooo why doesn't the same units in
the grainger catalog draw 29? it's late and i'm rambling.
i've discovered that the vibrating table is a little too small
for the larger bell jar, so this may be part of my problem. i
can't test with the smaller bell jar because i lent that out.
i'll git it back tho.
because of these problems, now i'm carefully weighing out the
investment, tho i thought i could get away with weighing the
water, i don't think so now. the cc graduate is on the way. i
try for a 40/100 as the satin cast instructions say. i buy the
40 or 50 lb box and throw out any i have left after about 3 mo.
like you said, i religously checked the window on the vacuum
pump looking for water or debris, not even thinking about what
floats on top of what.
what is surfactant? i looked it up in my 20lb dictionary and it
wasn't in there.
i'm basically a guy who was inspired to start casting because of
problems described in the "crummy castings" thread. now i enjoy
the control of deadlines and mostly enjoy the process. i also
like to know i did the whole thing.
thankyou again for your invaluable advice. i'll let you know
how things go after i get these things straightened out.