I assume you mean for the blacksmith.

Hammers - Can wield either head, I think - 2 or 3 bars heated, blunt heads, one hand grip - equip with.. e?  I think, it always but maybe that's configurable - whatever your interact button is aside from clicks. Must have hammer slot selected for "new" hammers to be equippable

Pickaxe - can be any grip, just needs a proper head - can equip first pick from any slot, but once there is a pick, must select pick slot to equip new picks.

Hatchet - Must be small-ax head, can be one or two hand grip same as Pick otherwise.

To Change select head for Smithing - You must have a specific number of heated ingots on anvil.

1 Heated ingot on Anvil -> Small blade/Knife

2 heated ingot on Anvil - > Small Blunt head, Small Ax head, normal blade

3 heated ingots -> Large Blunt head, Large Ax head - Large Ax head is also Pickaxe head (Must be struck again), large blade.

Any Blade + pole grip = Sellable Polearm

Any Hammer head + polegrip = sellable polearm

Axe+pole =/= Sellable

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2h Grip + Pickaxe head = "Pickaxe"  (sellable/customer recognized)

1h grip + Pickaxe head = nothing, But Blacksmith can recognize it for personal use pickaxe

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1h grip + small ax head = "one hand ax"  (I call em Hatchets)

2h grip + small ax head = nothing - but Blacksmith can recognize it for personal use hatchet

get yourself a new type of hammer to make them want a new type of metal

Go to the mines, they are behind the woods

you don't?

Once you equip it, that's it. That's where it'll remain, if you don't want to equip it, you can just hold it like any other weapon or box and carry it around, setting it down, etc

afaik at least, I didn't actually try and see if it still had physics

You can also press 4 to put it away. To bring it back, press 4 again. 

Why are you commenting in such an old post? But anyway you can't un-equip anything in slots 1, 2 and 3 except for exchanging them for better tools. To un-equip and re-equip slot 4, just press 4 (default controls).

Press and Hold the Alt Button, this will allow you to rotate items that you are holding.

also what does the "sliding bar minigame " do?

i do know about it being for quality but what does the quality change? for example on a pick does it change the chances of getting more ores in veins?

finally, what do you do with rare wood logs? 

Must be a small axe head.

Can be equipped to a 2h or 1h grip, but must be small axe head, I usually use 2h myself to make it, in my mind, the most like a fire axe or woodcutter's axe kinda deal.

2 ingots.

If you have no axe equipped, you should be able to just equip it while on any slot, but if you do have one equipped, you need to select the corresponding tool's slot to equip a corresponding tool (said this way as it applies to all tools and their upgrades)

Try updating the game

are you using a polarm? because i think you should be able to make it with a two handed grip a guard and a great sword blade 

maybe you used two ingots instead of three