Question

A block of length 200 mm is machined by a slab milling cutter 34 mm in diameter. The depth of cut and table feed are set at 2 mm and 18 mm/minute, respectively. Considering the approach and the over travel of the cutter to be same, the minimum estimated machining time per pass is minutes

Answer 1

Feed rate F = 18 mm/min
Block length L = 200 mm
Approach length = over travel length = $L_1$
$=\sqrt{d(D-d)}=\sqrt{2\times (34-2)}$
= 8 mm
Machining timer per pass
$t=\frac{L+2L_1}{F}=\frac{200+2\times 8}{18}$
= 12 min