Factors affecting Cutting conditions
The main factors that affecting V, S, and a are:l
1. W.P material
2. Cutting tool geometry (tool angles)
3. Type of machining operation
4. Required surface finish
px; "> <Problem No.1 :
A cylindrical stainless steel rod with length L=150 mm, diameter D0
= 12 mm is being reduced in diameter to Df =11 mm by turning on
a lathe. The spindle rotates at N = 400 rpm, and the tool is
travelling at an axial speed of 200 mm/min
Calculate:
a. The cutting speed V (maximum and minimum)
b. The depth of cut and the feed
Solution
a. The maximum cutting speed is at the outer diameter Do, and is obtained
from the expression
V = π DoN /1000
Vmax = (π) (12) (400)/1000 = 15.072 m/min
The cutting speed at the final diameter Df is
Vmin = (π) (11) (400)/1000 = 13.816 m/min
b. From the information given, the depth of cut is
a = (12 – 11) / 2 = 0.5 mm
and the feed is
S = f / Ν
S = 200 / 400 = 0.5 mm/rev
1. W.P material
2. Cutting tool geometry (tool angles)
3. Type of machining operation
4. Required surface finish
px; "> <Problem No.1 :
A cylindrical stainless steel rod with length L=150 mm, diameter D0
= 12 mm is being reduced in diameter to Df =11 mm by turning on
a lathe. The spindle rotates at N = 400 rpm, and the tool is
travelling at an axial speed of 200 mm/min
Calculate:
a. The cutting speed V (maximum and minimum)
b. The depth of cut and the feed
Solution
a. The maximum cutting speed is at the outer diameter Do, and is obtained
from the expression
V = π DoN /1000
Vmax = (π) (12) (400)/1000 = 15.072 m/min
The cutting speed at the final diameter Df is
Vmin = (π) (11) (400)/1000 = 13.816 m/min
b. From the information given, the depth of cut is
a = (12 – 11) / 2 = 0.5 mm
and the feed is
S = f / Ν
S = 200 / 400 = 0.5 mm/rev
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