Thread: Frustrating arvo at the range. Powder charges.

Originally Posted by longshot

That is an example of inaccurate span that I mentioned earlier. In theory and most likely in practice it won't affect outputs but double weighing will confirm this.
Most instrumentation has this phenomenon, many car speedos are accurate at ~20kph but out by ~10% by the time they are up to 80kph. On some instrumentation equipment it is adjustable so some extent and on some not.
The only fix here would be to alter the pitch of the thread by 2/5 of 3/8 of !@$# all, too much hassle and likely not effective in the end, just something you have to live with.

One possible fix for the slide weight situation though is to gently loosen the screw on the right and move the washer under the screw so that it engages with the beam notch 'floors'. From what you are saying, the washer could be set high and hitting the notch 'walls' thereby allowing the beam slide weight to move slightly within the notches.

One other area for improvement would be to bend the wire that the pan hangs from so the top hook hangs more vertically. At the wide curve level with the top of the pan would be best, just make the curve a bit wider. As things are currently it looks like the hook has potential to slide side to side in the hanging loop. If it slides to the right this would show a heavier charge then what there is and to the left will give a lighter charge. You will be able to judge if it can slide as it is, it is hard to judge from a photo.

Good observations, I hadn’t looked at the pan mounting. If I got really enthusiastic I could screw the brass screw the weight is on out a fraction but I’m sure it’s got locktight from a quick test so don’t want to damage anything for no real gain. I’ll get hold of some check weights which should negate any deviations on the beam balance weight by checking each time it’s moved.