REFLECTOR: epoxy pump ratio

[lawrence epstein]

is that ratio supposed to be by weight or volume??


>From: Steve Goldman <steve at fatcatair.com>
>Reply-To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
>Subject: REFLECTOR: epoxy pump ratio
>Date: Sat, 16 Sep 2006 14:43:51 -0400
>
>Well I've finally was ready to actually start mixing epoxy to attach the 
>wing
>foam cores. First thing I do though is check the ratio I get from my
>Michael Eng. pump. It's wrong. When I calculate the wt. ratio I have .537
>very consistently. I used two scales and they both agree. I've checked the
>distance of the hardener setting and it's correct (2.25 in.) The slide is
>directly under the hardener piston like it is supposed to be. I've tried
>pumping very slow (waiting 15+ sec. at the bottom of the stroke) to be
>sure cavitation shouldn't be an issue. No matter I get the same ratio.
>
>Since the pump is brand new I wouldn't expect a problem with the check
>valves but unless the calibration of these things is normally this
>far off I'm not sure what to do. (If the calibration is commonly off
>this far I can't see the point of the table for all the ratios.)
>
>
>--
>Steve Goldman
>'77 Tiger N28531
>Velocity XL5-RG (T-3485hrs)
>Pittsboro, NC (9NC8)
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