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

Solution problems, hello I do not currently have my money. it turns out tha...

hello I do not currently have my money. it turns out that you will not extend your hand to me.

What is hydrostatic extrusion, Q. What is Hydrostatic extrusion? • In t...

Q. What is Hydrostatic extrusion? • In the hydrostatic extrusion process the billet is completely surrounded by a pressurized liquid, except where the billet contacts the die.

Proell governor., how to solve numerical of proell governor

how to solve numerical of proell governor

Forces and equilibrium, write a notes of system of forces and classified it...

write a notes of system of forces and classified it a/c to orintenssion of forces

Explain the back rake angle, Explain the Back Rake Angle It measured th...

Explain the Back Rake Angle It measured the downwards slope of the top surface of the tool from the nose to the rear along the longitudinal axis. Its purpose is to guide the di

Corrosion resistance of tantalum, Q. Corrosion resistance of tantalum? ...

Q. Corrosion resistance of tantalum? Tantalum is readily attacked by strong alkalis, even at room temperature, and therefore, is not suitable for use in processes where the pH

Engineering Mechanics, What are the practical applications of solid cylinde...

What are the practical applications of solid cylinder or shaft under cyclic axial loading

Corollaries of first law of thermodynamics, Corollaries of first law of the...

Corollaries of first law of thermodynamics: First law of thermodynamics has significant corollaries. Cor ollary 1: (First Law for process). There exists property of

Question, A28) cm diameter pipe carries oil of sp. gr. 0.9 at a velocity of...

A28) cm diameter pipe carries oil of sp. gr. 0.9 at a velocity of 3 m/s . At another section diameter is 20 cm. find the velocity at this section and also mass rate of flow of oil.

What is the eutectoid composition, Question 1 What is the eutectoid com...

Question 1 What is the eutectoid composition in the phase diagram? Question 2 For an alloy of 40%C/60%D at 400°C, indicate the phase/s that are present. It is not neces

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