Estimate the machining time, Mechanical Engineering

Assignment Help:

Estimate the Machining Time

A hollow workpiece of 60 mm outside diameter and 150 mm length is held on a mandrel among centers and turned all over in 4 passes. If the approach length = 20 mm, over travel = 12 mm, average feed = 0.8 mm/rev., cutting speed = 30 m/min, estimate the machining time.

Solution

We know that,

Cutting speed = π DN /1000

or,         30 = ( 60 × π N )/1000

N = 159 rpm

 Now, the total (length) traveled by the tool in a single pass in given by :

L = 150 + 20 + 12

= 182 mm

Therefore, the total length traveled by the tool in its 4 passes is given by :

L1 = 182 × 4 = 728 mm

Now, the machining time (T) is given by following:

T =       L1/ feed × N

      =    728 / (0.8 × 1.59)

      = 5.72 minutes


Related Discussions:- Estimate the machining time

Theory of production process, In Grey Cast Iron, carbon is present in -----...

In Grey Cast Iron, carbon is present in ------------form while in white cast iron, it is found in ----------- form.

MOS., WHY SHEAR STRESS IS NOT MAXIMUM AT THE NEUTRAL AXIS IN TRIANGLE...ITS...

WHY SHEAR STRESS IS NOT MAXIMUM AT THE NEUTRAL AXIS IN TRIANGLE...ITS MAX IN ALL OTHER CASES BUT Y NOT IN TRIANGLE?#

Kinematics, derive an expression for range along iclined palne

derive an expression for range along iclined palne

Locomotive boiler, advantages and disadvantages of locomotive boiler

advantages and disadvantages of locomotive boiler

Arc blow, ARC BLOW In certain cases depending upon where the return pa...

ARC BLOW In certain cases depending upon where the return path connections are given for the arc current, the arc may be deflected towards a direction of weaker electro magnet

When was pddi developed, When was PDDI developed The PDDI interface was...

When was PDDI developed The PDDI interface was developed in connection with the ICAM project which was funded by the Air Force in order to improve the manufacturing methods in

What is carbon steel, Q. What is Carbon steel? Carbon steel has long be...

Q. What is Carbon steel? Carbon steel has long been used for handling concentrated sulphuric acid under ambient temperature and low velocity conditions. In service, a soft sul

What do you mean by machinibility, (a) What do you mean by machinibility ? ...

(a) What do you mean by machinibility ? Discuss the factors which come into play while evaluating the machinability of any metal. Also describe machinability index. (b) Brass co

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd