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1 擬以高速鋼鑽頭在展性鑄鐵上,鑽一12mm孔,若鑽深30mm,試問鑽頭靜點接觸工作表面後,其進刀深度為若干?
A 30.8mm
B 33.5mm
C 36.8mm
D 39.5mm
鑽削行程L=H+(D/2)cotθ=30+6(0.577)=33.56mm