Re: [bolger] Epoxy mixing
On Sat, 30 Dec 2000, Chuck Leinweber wrote:
They are prone to inaccuracy, and one of my frames is glued with a very
spongy epoxy saturation, and one of my hull side butt blocks never set up,
because of the pumps putting out the "wrong" amount.
I fixed the frame by doubling and tripling the number of ring nails and
screws, but I had to rip off 12 inches of sides, and start again. I was
fortunate that this did not mean buying four new sheets of plywood--the
design had about 14 inches to spare.
In short--do not trust the cheap pumps. They fail, and your project can
along with it. Mine almost did.
Chris Crandallcrandall@...(785) 864-4131
Department of Psychology University of Kansas Lawrence, KS 66045
I have data convincingly disconfirming the Duhem-Quine hypothesis.
> I have found that the cheap pumps that you can get from the resinWhile this is true, I almost had a boat ruined by relying on such pumps.
> suppliers are very easy to use.
They are prone to inaccuracy, and one of my frames is glued with a very
spongy epoxy saturation, and one of my hull side butt blocks never set up,
because of the pumps putting out the "wrong" amount.
I fixed the frame by doubling and tripling the number of ring nails and
screws, but I had to rip off 12 inches of sides, and start again. I was
fortunate that this did not mean buying four new sheets of plywood--the
design had about 14 inches to spare.
In short--do not trust the cheap pumps. They fail, and your project can
along with it. Mine almost did.
Chris Crandallcrandall@...(785) 864-4131
Department of Psychology University of Kansas Lawrence, KS 66045
I have data convincingly disconfirming the Duhem-Quine hypothesis.
James:
I have found that the cheap pumps that you can get
from the resin suppliers are very easy to use. I also use other two
part resins (non boat building) which are too thick for pumps. For them I
have to use a scale, but I sure tried to get a pump to work, because it is so
much more convenient.
Chuck
Hi,I have been working in dribbles on my Nutmeg sail boat. There is lots of mixingof small quantities of epoxy involved in the initial frame work. You all probably know this but I have found that it is a lot easier to mix by weight than by quantity in small batches. I bought a digital scale on the web and have been using that. It has a tare setting, so I just set an empty mixing container on it and pour in epoxy.for really small batches it reads in grams as well. One thing that you have to watch out for is that 1 to 1 in volume is not necessarily the same as 1 to 1 in weight. Your epoxy supplier can tell you what the correct ratio is. It is a lot easier to get an absolutely accurate ratio using the scale.James Fuller
Hi,
I have been working in dribbles on my Nutmeg sail
boat. There is lots of mixing
of small quantities of epoxy involved in the
initial frame work. You all probably know this but I have found that it is
a lot easier to mix by weight than by quantity in small batches. I bought
a digital scale on the web and have been using that. It has a tare
setting, so I just set an empty mixing container on it and pour in
epoxy.
for really small batches it reads in grams as
well. One thing that you have to watch out for is that 1 to 1 in volume is
not necessarily the same as 1 to 1 in weight. Your epoxy supplier can tell
you what the correct ratio is. It is a lot easier to get an absolutely accurate
ratio using the scale.
James Fuller