Scale Reads Different

[Brijake]

I'll try to keep this short but can't figure out what's going on.

I have and FX 120 topped with a V4 Autotrickler. Right next to it I have an FX 300. Both scales less than a year old and calibrated both before I started (twice) I let the Autotrickler do its job and then double check weight on the 300. The 120 that has the autotrickler I use a 419 cup, on the 300 I use the provided glass cup.

Over and over the glass cup will register more than the 419 cup (with 83 grains of powder) by .02 to .04. I tare each and it will still do the same. I then take the 419 and move it to the 300 and it reads same as it did on the 120. I take the glass cup from the 300 and move it over to the 120 and I get that fluctuation there too. Gotta be the glass cup somehow?

Hope this makes sense but I can tell you both cups are zeroed when they are put on the scale. I can only think that the 419 cup is just better?

I plan on calling AandD tomorrow but wondering if someone has had this same problem, besides basics stupidity on my part!

 

[Phil Rizzo]

Very simply put, I would use the same cup and scale for the same jobs, regardless of anything else.
I know it shouldn't matter, but….

 

[Brijake]

That would be a lot easier than driving myself crazy trying to figure it out. Actually I think you were being nice and really meant to say to keep it simple stupid!! There really was no reason for me to transfer from one cup to the other except speed in dumping in one and putting the other back under the trickler.

 

[Phil Rizzo]

A .02 grain difference is within spec anyhow isn't it?
I'll adjust for .04 but .02 gets a pass…from me

 

[Brijake]

Yes I agree with you on that. The .04 was more prevalent than the .02 though. And not one time out of 20-30 tries did it ever read the same.