REFLECTOR: epoxy pump ratio

[Tony Babb]

You can adjust the hardener/resin ratio by sliding the attachment underneath
the hardener where it connects to the horizontal arm. Move it to the left
for less hardener and to the right for more hardener. You have to loosen the
bolts holding the connector to the horizontal arm then remember to tighten
them when you're done and recheck. I found I was moving it maybe 1/8 or 1/4
inch at most, usually less than that.

Tony
SEFG 62% done, 78% to go
www.alejandra.net/velocity.

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Douglas Holub
Sent: Saturday, September 16, 2006 2:25 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: epoxy pump ratio


How do you adjust it?

----- Original Message ----- 
From: "Tony Babb" <tonybabb at alejandra.net>
To: "'Velocity Aircraft Owners and Builders list'" <reflector at tvbf.org>
Sent: Saturday, September 16, 2006 4:01 PM
Subject: Re: REFLECTOR: epoxy pump ratio


> Steve,
>
> I also have a Michaels pump. As I recall the initial calibration was 
> slightly off (maybe 47:100?) from what I needed (44:100). Not 
> surprising since they sell these things to lots of different people 
> doing different things with them. I bought mine several years ago and 
> I don't recall them providing any measurements, I just adjusted it 
> until I got 44:100. Are you remembering to subtract the weight of the 
> empty container from the total weight of the container with harder or 
> resin in them before you do the ratio calculation? I usually do about 
> 10 pumps to get a reasonable sample size and
> minimize errors. I also recheck every now and again, such as before I do
> anything structural or if I haven't used it in a while.
>
> Here's what mine looks like 
> http://www.alejandra.net/velocity/images/heated%20box%202.JPG
>
> Good luck,
>
> Tony
> SEFG 62% done, 78% to go
> www.alejandra.net/velocity
>
> -----Original Message-----
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] 
> On Behalf Of Steve Goldman
> Sent: Saturday, September 16, 2006 11:44 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: REFLECTOR: epoxy pump ratio
>
>
> 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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