Building a Small Scale Balance - PowerPoint PPT Presentation

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Building a Small Scale Balance

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  1. Building a Small Scale Balance • Start with the support posts. Holes are punched through the straws with a standard hole punch.

  2. 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.

  3. 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

  4. 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.

  5. 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!