REFLECTOR: epoxy pump ratio

[Douglas Holub]

Mine must be older. It has no adjustment. The arm pivots on a bolt through 
the metal back piece, and the plungers are attached to the arm with what 
look like links from a motorcycle chain. (Picture attached.)

Doug
----- 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 8:05 PM
Subject: Re: REFLECTOR: epoxy pump ratio


> 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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>>
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>
>
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>
> _______________________________________________
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