Goku did it, and look how buff he is now!
I searched around for ages looking for an instructable on wrist and/or ankle training weighs, which I could wear during my everyday activities, and put some exercise into my otherwise fairly lazy life.
All the articles I came across, however, produced big chunky weights full of sand, or wheat, which could only really be used during actual training, without looking silly.
So I sought to make a pair of wrist weights which I could wear all the time, and look cool. Maybe even pick up (ok wishful thinking).
Step 1: Theory
Sand and wheat are great, accessible, easy to work with materials, but at 1.6 and 0.6 grams per cubic centimetre respectively, I needed something more dense.
Lead (atomic number 82, chemical symbol Pb) is very heavy - about 11 grams per cubic centimetre, extremely soft and malleable, and has a melting temperature of only 327 degrees celsius. These characteristics all combine to form the perfect material for my purposes. My only other choice would have been Uranium, but that's a bit harder to obtain. And it causes cell mutation/super powers.
Lead is a heavy metal. It is poisonous if ingested or inhaled, causing nerve damage, blood and brain disorders. Make sure you wash your hands thoroughly after handling, and use proper ventilation during the melting process. Also wipe down the food preparation surfaces near the stove afterwards. If you have children, you may want to wash your clothes after working with lead, to avoid exposing them to any lead particulate on your clothes.
Step 2: Materials
- Lead. Luckily for me, my Mum does Lead-lighting as a hobby, and had tons (really!) of offcuts which I could use.
You could pick up offcuts and scraps from a lead-lighting shop, or fishing sinkers are good too. I don't know if fishing shops through out old ones, or something, but it's worth a shot (haha lead shot). Unfortunately this is one instructable where you can't find the materials at the tip, because tips won't accept heavy metals.
- A Mold. I Chiseled mine out of a block of wood.
- Toweling material. I cut up an old towel (duh!). And some velcro.
- An old pot with which no-one will EVER cook again. It is now quite poisonous.
note: The pot is in no danger of melting as aluminium melts at a temperature more than twice that of Lead.
Step 3: Measurements
Step 4: Make a Mould
In order to have as much weight in as little wristbands as possible, I needed to have them be solid lead. Not pouches filled with offcuts. So I chiseled a 22cm long ingot out of a block of pine, into which I would pour molten lead (it's not gunna catch fire at a mere 300 degrees).
At 11 grams per cubic centimetre, I calculated that 1 kilogram of lead would occupy 90 cubic centimetres, or 90 millilitres. I chiseled out what I thought looked about right, then tested it by pouring 100 mL of water from a measuring jug into the mould. It overflowed, so I carved out a little bit more.
Step 5: Alchemy
I covered my mould in aluminium foil to make it easier to get the solid ingot out later on. Then, when there were no chunks left, I poured the molten lead into the mould.
Step 6: Bending to Wrist-shape.
Step 7: Hinges
Step 8: Outer Material
A tube with double thickness toweling on the inside half, and curtain material on the inside of the ouside half (understand?) to provide strength when I sewed on the velcro, and Voila! 2 X 1Kg wrist weights.