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Faculty of Mechanical and Industrial Engineering (2011 E.C.)

The document describes several mechanical engineering problems involving turning operations on a lathe. Problem 1 involves calculating the machining time to reduce the diameter of a stainless steel rod. Problem 2 involves calculating the total machining time for a two-step turning operation. Problem 3 involves calculating the machining time to reduce the diameter of a mild steel rod in one pass.

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240 views2 pages

Faculty of Mechanical and Industrial Engineering (2011 E.C.)

The document describes several mechanical engineering problems involving turning operations on a lathe. Problem 1 involves calculating the machining time to reduce the diameter of a stainless steel rod. Problem 2 involves calculating the total machining time for a two-step turning operation. Problem 3 involves calculating the machining time to reduce the diameter of a mild steel rod in one pass.

Uploaded by

Roha Engineering
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Faculty of mechanical and Industrial Engineering (2011 E.C.

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 υ=200 mm/min

2. The part shown below will be turned in two machining steps. In the first step a length of (50 +
50) = 100 mm will be reduced from Ø100 mm to Ø80 mm and in the second step a length of 50
mm will be reduced from Ø80 mm to Ø60mm. Calculate the required total machining time T
with the following cutting conditions:

Cutting speed V=80 m/min,

Feed is f=0.8 mm/rev,

Depth of cut = 3 mm per pass.

Prepared by: Wudu W.


Faculty of mechanical and Industrial Engineering (2011 E.C.)

3. A mild steel rod having 50 mm diameter and 500 mm length is to be turned on a lathe.
Determine the machining time to reduce the rod to 45 mm in one pass when cutting speed is 30
m/min and a feed of 0.7 mm/rev is used.

4. Determine the angle at which the compound rest would be swiveled for cutting a taper on a
work piece having a length of 150 mm and outside diameter 80 mm. The smallest diameter on
the tapered end of the rod should be 50 mm and the required length of the tapered portion is 80
mm.

5. The work piece has 150mmlong and 50mm diameter turning on a lathe reduces to 130mm
long and 30mm diameter. The work piece at the cutting speed of 80m/min, the feed is 0.2mm/rev
and maximum depth of cut is 3mm. Calculate the total time required to machine a work piece?
Assume Approach and over travel distance are 3mm and 3mm respectively, for turning
operation.

6. The shaft shown in the figure below is to be machined on a lathe from a Ø 25mm bar.
Calculate the machining time if speed V is 60 m/min., turning feed is 0.2mm/rev, drilling feed is
0.08 mm/rev and knurling feed is 0.3 mm/rev.

7. A batch of 800 workpieces is to be produced on a turning machine. Each workpiece with


length L=120mm and diameter D=10mm is to be machined from a raw material of L=120mm
and D=12mm using a cutting speed V=32 m/min and a feed rate f=0.8 mm/rev. How many times
we have to resharpen or regrind the cutting tool?

In the Taylor’s expression, use constants as n=1.25 and C=175.

Prepared by: Wudu W.

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