on 9/27/03 4:07 PM, John & Amy Eckel at eckel1@comcast.net wrote:
>
>
> I think you have missed the point Ron was making about electronic scales
> timing out.
> Ron was at my house looking at my Europa when he tested my scale for this
> problem. I have a My Weigh 3001, which has a 1 gram accuracy.
> Ron tore up a piece of paper and placed it on the scale. It weighed 3
> grams.
> He took the paper off the scale and then put the paper back on a little at a
> time over about 5 seconds. The scale showed 0, yes ZERO.
> I just reran the experiment with 2 sheets of paper that weigh 5 grams.
> I riped them into 9 pcs and placed them on the scale at 1 sec intervals,
> the scale read 0. When I lifted the paper it read -5 grams.
> This means that if you are adding the last bit of epoxy/hardener to the cup
> slowly to get the weight exact you may not be where you think you are.
> The way to check this is to lift the cup off the scale and it should go
> back to
> zero of the last reading you had.
>
> John, A230
>
> Subject: Re: Europa-List: Caution for those using Electronic Scales ? Mix
> info
>
>
> <mx@crixbinfield.freeserve.co.uk>
>>
>>> I wonder if any of you fine folks that have chosen an electronic scale
> could
>>> try this test. I have yet to purchase one but will soon. Speaking with
> my new
>>> friend Jeff on Thursday night, I had thought of purchasing the Ohaus
> c200.
>>> Can anyone make a brand and model recommendation that can pass scrutiny?
>>> Much thanks.
>>> Brian
>>
>> I have an Ohaus LS200, bought in 1996, I expect there is a new model by
> now.
>>
>> It passes the test and I have never noticed any anomolous behaviour with
> it. As
>> said previously, it powers down (losing your reading) after several
> minutes of
>> inactivity. This can be prevented by tapping the scale to disturb the
> reading,
>> the timeout starts again. I have been very happy with it.
>>
>> For builders using the Ampreg epoxy, SP ask for a mix tolerance of 1% (for
>> optimum performance, no doubt). Does anyone know what the 'official' mix
>> tolerance is for Redux (or whatever it is called at the moment) ?
>>
>> Johnh Clif
>> #0259
>>
>>
>
>
>
>
>
>
Sometimes we seem to just beat a subject to death. Our friends at Flight
Crafters have built more Europas than anyone on this side of the pond. After
I built a scale, I went there and did 3 weeks of fun building. They were
using an electronic scale that measured in 10ths of grams and their lies the
difference. I bought an Ohas C200 that measures in 10ths of grams and Im
just about finished with my airframe without any problems.
Use the scale follow the chart that comes with the kit and mix only what you
need. Its cheep, Its easy, its quick, and it works!
Jeff
A258
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