Originally Posted by
jha07
I've got 4 scales as well, and use them to set my tweak regularly.
First thing you need to check is that the scales are all level. I know you said you're using a granite floor, but the scales themselves could be a bit off. It's doesn't take much to cause a 90 gram difference.
After all four scales are perfectly level, I use the spring collars to get the cross weights equal. I almost never have my collars set equal left to right, but I trust what my scales are telling me. The reason I think the collars aren't equal is because nothing is exactly equally from left to right. Things like a slight difference in spring length create this.
Something I learned the hard way is that most of those little digital scales are not calibrated. You will need a calibration weight to check each scale to make sure they all read the same value. I think most of them need about 500 grams to validate their accuracy. Mine were off by as much as 75 grams. Don't think that by simply "zeroing" the scales, they are equal. That's not the same as calibrating.
