As the title says, mechanical toolheads do not wear out right now, tested in Survival and Creative (Singleplayer).
Confirming, zero durability damage. Included screenshots to show the planks I cut then the Plank Toolhead on sawmill.
Fixed with latest patch 0.7.1.25A360 and I quote from the changelog
- Mechanical crafting stations now damage their toolheads again.
Confirming fixed with screenshot as well.
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