While designing the vessels that will be the weights for my clock I realized that I had no idea how much volume to allow for the lead inside, or even how much a given volume of lead actually weighs. The vessel design I’m considering is a wooden sphere with a cube-shaped hollow inside that will be filled with lead shot after the sphere is turned on the lathe. The question was, “how big should the hollow be to allow for 3# of lead shot, or for 6#,” etc.

Fortunately, the solution was only a Google search away. In fact, I’m so happy with this online calculator I thought I would share it:

http://www.allmeasures.com/Formulae/static/formulae/density/20.htmTo use it, just enter one known variable—such as 6#, and the calculator will determine the volume of lead needed in cubic inches, cups, bushels or just about any other measure you like. It can also be used in reverse—enter the volume of your vessel in cubic inches (or cups or whatever) and the calculator will display the weight of lead needed to fill it. Using it I learned that 3# of solid lead require 7.32 cubic inches of space.

Since my clock weights use a “cube” of lead inside, I also needed to quickly calculate the “cube root” of 7.32 cubic inches in order to visualize just how big that cube really is. A hasty search of my desk drawer reminded me that I had sold my scientific calculator at a garage sale ages ago. A second Google search turned up this “Cube Root Calculator:”

http://www.csgnetwork.com/cuberootcubecalc.htmlSo, 3# of lead occupy 7.32 cubic inches of space which is a solid cube measuring 1.94 inches on a side. My DSL connection just paid for itself! I hope other members will find these calculators useful too.

Rob Walker

Bend Oregon

PS: This was my first post and I'm thrilled to be a part of the group. Thanks for making it available!