Anatomy of a Drill Bit

One allowance here buys 484,390 EXP, the best of the 3 Lv 58 Carpenter tradecraft leves that record EXP: the runner-up manages 421,420 EXP, 13% less.

Across that rung the return runs from 183,570 EXP to 484,390 EXP per allowance — 3 distinct figures spanning 164%, so the wrong pick leaves 300,820 EXP of the allowance unspent.

On whether to wait: the best Lv 60 Carpenter tradecraft leve returns 812,920 EXP per allowance, 68% more than the best on this rung, while the Lv 56 rung behind tops out at 656,800 EXP.

At Lv 58 this data holds 54 leves paying EXP across 3 categories: the 24 Tradecraft ones average 443,090 EXP per allowance, the 3 Fieldcraft ones 1,079,567 EXP and the 27 Grand Company ones 228,371 EXP, which puts this leve 9% above its own category's average.

Dragonscale Grinding Wheel ×1 is a Lv 59 Carpenter recipe, 2 steps deep through 2 intermediates, costing 18 units of raw material and 25 crystals.

Handing that in returns 26,911 EXP and 66 gil for every unit of raw material the order swallows, and the tree needs Carpenter and Goldsmith.