31 January 2017

Feed depth of cut and machining time for lathe machine

Some important parameter keeps in mind while operating on a lathe machine.
Feed :
The feed of cutting tool in lathe work is the distance the tool advances for each revolution of the work. 
The feed is expressed in millimetres per revolution.

Depth of cut :
The depth of cut is the perpendicular distance measured from the machine surface to the uncut surface of the work piece. 
Depth of cut =  d1-d2 / 2

d1 = diameter of the work surface before machining
d2 = diameter of the machined surface

Depth of cut varies inversely as the cutting speed. 
for the general purpose, the ration of the depth of cut to the feed varies from 10:1

Machining Time :
The machining time in the lathe work can be calculated for a particular operation if the speed of the job, feed length of the job is known.
Machining time = l / s * n min

l = length of the job in mm
s = feed of the job in mm 
n = r.p.m of the work