As an F1B sportsman, I often weigh rubber motors (weighing motors right now for the Nats as a matter of fact). I still use a triple beam balance for motor weighing as the pan is very large, robust and there are no static issues. I'd use a digitial scale but all my scales are pocket scales with a small tray or pan. I think that if the motor was isolated from the scale (by what?) or grounded(?) it should be good for weighing motors. And you would need to make an adapter to be able to hang the motors from.
Tony
To: indoor_construction_at_yahoogroups.com
From: hermanna_at_hotmail.com
Date: Thu, 29 Jul 2010 19:29:41 +0000
Subject: RE: [Indoor_Construction] Report on $15 milligram scale
I too am blown away by the price & performance. As to the corner test, slight variations between strain gages and their locations makes a large difference in sensitivity to load position. This is usually reduced by removing material from the holes under the gages. Thus it is suspected that there could be a significant difference between scales. Other parameters expected to vary between units are creep & temperature effects, tho they are not major factors the way these are used.
Many F1B sportsmen claim digital scales cannot be used for weighing motors. I have not noticed this with industrial strength metal scales, and suspect it has to do with electostatic forces between rubber & surroundings rather than electrostatic effects on the electronics.
Thanks for the scale info,
H
To: Indoor_Construction_at_yahoogroups.com
From: wdgowen_at_gmail.com
Date: Thu, 29 Jul 2010 11:02:46 -0400
Subject: Re: [Indoor_Construction] Report on $15 milligram scale
I was surprised that moving the weight around on the pan didn't make much difference in the reading. Maybe Leo can explain why. At any rate I may try to make a larger pan and also an adapter to hang motors for weighing. I'm also considering buying another one or two of these for backups and putting my Acculab up for sale.
----- Original Message -----
From: Fred or Judy Rash
To: Indoor_Construction_at_yahoogroups.com
Sent: Thursday, July 29, 2010 8:12 AM
Subject: Re: [Indoor_Construction] Report on $15 milligram scale
Thanks, Bill. That seems much better than what I did. i glued a small balsa platform to the supplied thimble, but it is still not stable enough and the display can be somewhat obscured. I'll copy you to glue on an adapter tube and raise and enlarge the pan, and maybe make two sizes of pan.
Fred Rash
On 7/29/2010 12:26 AM, olbill61 wrote:
http://www.hippocketaeronautics.com/hpa_forum/index.php/topic,3650.msg36662.html#msg36662
The link above is some info on the $15 milligram scale I bought recently. The scale seems to perform very well. The message above shows a simple adaptation I made to get around the problem of the tiny weighing pan.
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Received on Thu Jul 29 2010 - 12:43:18 CEST