The art of crafting it´s simple if you understand the basic principles. For example, all convertation it´s 2 stones for one, and so you can have all stones you want. It´s like this:

BODY to ARCANE to MIND to BODY

EARTH to AIR to FIRE to WATER to EARTH

GOOD to CHAOS to EVIL to LAW to DIVINE to GOOD

So, it´s 2 BODY to 1 ARCANE, 2 ARCANE to 1 MIND and 2 MIND to 1 BODY. And like that for the others. But IF you don't want convert Stones, you can get it from the weapons and armors you have. But what give what? Let´s look in the recipes of the machine and discover. Remember, the names here don't have lesses or I, so the name of your weapon or armor its like this:

something like Less or great name something like I or X
XXXXX NAME OF LIST XXXXX

So, your weapon of mithral or silver DO NOT it´s afected by this list:

(BODY) - POISON SAVE; MOVE SILENTLY; JUMP; HIDE; DISABLE DEVICE; OPEN LOCK; TUMBLE; BALANCE; BLOOD; FORTITUDE SAVE; TENDON SLICE; REINFORCED PLATING; FALSE LIFE; STRENGHT; DEXTERITY; CONSTITUTION; BASHING; NATURAL ARMOR; INVULNERABILITY; HUMAN BANE; TRANSMUTATION FOCUS; STENCH; FEAT: MOBILITY; CRIPPLING; BLOOD RACE; WEAKENING; DESTRUCTION; BODYFEEDER; WOUNDING; SLICING; BONE BREAKING.

(ARCANE) - IMPACT; MENDING; EFFICACY; SPELL PENETRATION; REPAIR; RECONSTRUCT; ENHANCEMENT BONUS; ARCANE CASTING DEXTERITY; ARCANE SIGIL; OOZE BANE; SPELL RESISTENCE; AXE BLOCK; SPEAR BLOOCK; HAMMER BLOOCK; SONGBLADE; IMPULSE; WIZARDRY; POTENCY; GIANT BANE; CONJURATION FOCUS; TWILIGHT; EVOCATION FOCUS; GHOST TOUCH; EFFICIENT METAMAGIC.

(MIND) - SEARCH; BLUFF; DIPLOMACY; HAGGLE; LISTEN; SPOT; CONCENTRATION; DECEPTION; ENCHANTMENT SAVE; ANIMAL BANE; VERMIN BANE; WILL SAVE; CHARISMA; INTELLIGENCE; WISDON; ILLUSION FOCUS; ENCHANTMENT FOCUS; ATTACK BONUS; SECRET DOOR DETECTION.

(EARTH) - EROSION; SHATTER; CORROSION; FORTIFICATION; PROTECTION; SHIELD SPIKES; ACID GUARD; STABILITY; ACID LORE; ACID; ACID RESISTENCE; ACID BURST; THORN GUARD; STTAGGERING BLOW.

(AIR) - SONIC GUARD; RESONANCE; MAGNETISM REFLEX SAVE; CACOPHONY; SPARK; DWARF BANE; LIGHTNING GUARD; RANGED ALACRITY; STRIDING; DODGE BONUS; SHOCKING BURTS; VERTIGO; ELETRICAL ABSORPTION; FINESSE; SONIC LORE; FEATHER FALLING.

(FIRE) - COMBUSTION; PLANT BANE; HALFLING BANE; INFERNO; ELF BANE; FIRE GUARD; FIRE RESISTENCE; FLAMING; FIRE LORE; FLAMING BURST.

(WATER) - COLD TOUCH; FREEZE; GLACIATION; GNOW BANE; REPTILIAN BANE; GOBLINOID BANE; SNOW BURST; STUNNING; ICE GUARD; UNDERWATER ACTION; COLD RESISTENCE; PARRING; ICE LORE; ICY BURST.

(GOOD) - ARDOR; BEATITUDE; DEVOTION; BENEVOLENCE; EVIL OUTSIDE BANE; UNDEAD BANE; HEAL; DISEASE IMUNITY; HALLOWED; HOLY; HOLY BURST; DEATHBLOCK; HEALING LORE; PURE GOOD; LIFE SHIELD.

(CHAOS) - VICIOUS; LAWFUL OUTSIDE BANE; SNEAK ATTACK BANE; CONSTRUCT BANE; SHATTERMANTLE; VENGEFUL; ROARING; ALIGNED; ANARCHID; TELEKINETIC; MAIMING;TRUE CHAOS.

(EVIL) - NIHIL; INTIMIDATE; NULLIFICATION;NECROMANCY FOCUS;STEALTH STRIKE; VOID LORE; CURSESPEWWING; NEGATIVE ENERGY ABSORPTION; INCITE; UNHOLY; VAMPIRISM.

(LAW) - CHAOTIC OUTSIDE BANE; ABERRATION BANE; ORC BANE; EVERBRIGHT;BLUE SHINE; SEEKER;AXIOMATIC; TRUE LAW; SILVER FLAME.

(DIVINE) - BRILLIANCE; POWER; PERFORM; MAGICAL BEAST BANE; COMMAND; MONSTROUS HUMANOID BANE; ELEMENTAL BANE; DRAGON BANE; LIONHEART; ARMOR BONUS; GOOD LUCK – REFLEX; GOOD LUCK – WILL; ABJURATION FOCUS; FEARSOME; RESISTENCE; ETERNAL FAITH.

And so, now it´s like this, get the weapon, disconjunct it, get your essence, make it the name of list of you want, (for example a weapon of reptilian bane is maded with water essense) and construct it again and voilá, a new weapon. Easy right?