This is basically just a beam that gives a 2 to 1 mechanical advantage to whatever is being weighed. Applied to a 1g resolution electronic balance it will give effectively 0.5 g resolution.
This was knocked up out of scraps and tape to try out but will be progressively turned into a permanent gadget. (Glued up the fulcrum tonight with leftover epoxy).
Important points:
1) the beam has a groove and the fulcrum has a knife edge that fits into the groove to maintain the 2:1 ratio.
2) The tape at the left hand end is only to hold that end down and should be vertical. There should be enough tape to allow some lateral movement.
3) Cup must be centred over the 2:1 position which is the same distance from the fulcrum as the taped end. I cut out some tape to locate the cup as in the pic.
4) The beam must be very close to level to avoid effects of gravity that may cause weighing errors.
5) Fulcrum position on the balance plate is not critical - centred by eye will be fine.
6) Place cup on beam before zeroing the balance.
If all is set up as it should be then anything weighed on the beam will show double the actual weight. I found this enabled me to measure 6 gram batches much more consistently.
If any of this doesn't make sense it may be because I'm tired and falling asleep on the keyboard.
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