machining allowance; cutting stock
Technical term in machining and manufacturing: extra material intentionally left on a workpiece to be removed later, ensuring final dimensions can be met despite tolerances.
This part has been rough-machined with a 0.5 mm machining allowance left.
If the machining allowance is insufficient, the final dimensions cannot be achieved in finishing.
Compound of 削り (けずり, 'shaving' or 'cutting', the continuative form of 削る) and 代 (しろ, 'allowance' or 'margin'). The reading しろ for 代 is a specialized suffix meaning 'room' or 'allowance'.