Why can’t I craft a sawmill or armor? [duplicate]

Here are the steps to craft a sawmill (to see if you have anything "wrong")

1. Get 10 wood blocks (to make work bench)
2. Make a work bench and place it down
3. Get 2 bars, 10 chains and 10 wood. (Get the bars from iron/lead ore, you'll need an anvil and and a furnace, the chains will come from a bar (use anvil) and the wood from trees) If you need any help with getting any of these items, click the links for more information.
4. Go back to your workbench and with 2 bars (lead/iron), 10 chains and 10 wood in your inventory, and it should show up.

For more information click here

Hope it helps ~Kingsley