Presentation on theme: "Building a Small Scale Balance Start with the support posts. Holes are punched through the straws with a standard hole punch."— Presentation transcript:
Building a Small Scale Balance Start with the support posts. Holes are punched through the straws with a standard hole punch.
A Small Scale Balance Heat a piece of piano wire and melt a small a hole as possible through the pointer straw. This hole should be above the beam straw. (note in the photo it is below – this is wrong) Press the piano wire through the support straws to create holes in those.
A Small Scale Balance Use a hole punch below the wire hole to create a hole in the pointer straw for the beam straw. Slide the beam straw half-way through the pointer straw. Create “stops” for the pointer straw using two short supports and a cross piece. Make one for each side
A Small Scale Balance Melt three holes, 120 degrees apart, in two plastic “salsa” cups. Tie thread to each of these that will act as supports and connect with the beam straw.
A Small Scale Balance Sensitivity - Your finished balance should be able to measure as little as.002 grams! Capacity – Your balance should be able to measure as much as 10 grams, a difference in 4 orders of magnitude!