Re: Static charge and digital scales. from Don DeLoach on 2018-01-16 ([Indoor

From: Don DeLoach <ddeloach_at_comcast.net>
Date: Tue, 16 Jan 2018 13:48:06 -0700

I put an empty Kleenex box on top of the scale.

DD

> On Jan 16, 2018, at 9:38 AM, Jake Palmer 82.jake_at_gmail.com [Indoor_Construction] <Indoor_Construction_at_yahoogroups.com> wrote:
>
> I actually tossed a cheap scale because I was convinced it was not working properly. I later discovered it was static that was creating the issue. I find it particularly troublesome when weighing motors where I need a consistent level of accuracy. Weighing a freshly cut motor several times inside a small plastic cup on the scale produced variations of up to 10mg. I now use a piece of 1/64 plywood on top of the scale. This seems to eliminate the effects of the static, and I get much more consistent results.
>
>> On Tue, Jan 16, 2018 at 8:04 AM, Kurt Krempetz krempetz_at_yahoo.com [Indoor_Construction] <Indoor_Construction_at_yahoogroups.com> wrote:
>>
>> Hi Don,
>>
>> I find this a very interesting post. I couple years ago when I started building gliders with foam flaps I believe I observed this same issue. If I weighed a foam flap especially just after sanding it down, the scale just displayed crazy readings. I found that if you let the part sit on the bench for about 1/2 day the readings seem to be correct or at least display reasonable numbers. Other solution I used is support the part just above the scale but not on the scale and take a reading, then lower the part onto the scale and take another reading, the difference between those two numbers seems to give the same answer as letting the part sit. I likely am not trying to get as accurate of weighs as you (I am weighing to the .01g) , so these solutions might not be applicable to your situation.
>>
>> Cheers,
>> Kurt
>>
>>
>>
>> From: "don_at_slusarczyk.com [Indoor_Construction]" <Indoor_Construction_at_yahoogroups.com>
>> To: Indoor_Construction_at_yahoogroups.com
>> Sent: Tuesday, January 16, 2018 8:46 AM
>> Subject: [Indoor_Construction] Static charge and digital scales.
>>
>>
>> I am curious as to what others do in regards to eliminating effects of static charge when weighing on a digital scale. Since it is winter for me and humidity is low I am getting some static charge on wings and tails which cause the weights to vary. For the short term I have constructed a balsa "tower" that hold parts about 10" above the scale. That seems to work for smaller wings but a F1D wing needs to be much higher to get the scale out of the field. I only see this on plastic covered parts which makes sense. A motor stick or uncovered frame weighs are ok. I have tried Bounce anti cling dryer sheets but that takes time to discharge. Was hoping for a quick solution to discharge. I see they sell anti static devices for lab use but they are $2000 . Also read ionizers can work. Just curious as to what others have done.
>>
>> Don
>>
>>
>
>
Received on Tue Jan 16 2018 - 20:48:21 CET