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

Rigid bodies, A sign of uniform density weighs 270 lb and is supported by a...

A sign of uniform density weighs 270 lb and is supported by a ball-andsocket joint at A and by two cables. Determine the tension in each cable and the reaction at A.

Find out the maximum deflection in beam, Find out the maximum deflection in...

Find out the maximum deflection in beam: A beam of span 8m is loaded with UDL of 10 kN/m over the middle half portion. Discover the maximum deflection. EI is constant. Sol

Engineering mechanics, how to solve engineering mechanics statics problem?

how to solve engineering mechanics statics problem?

Function of heat pump, Function of heat pump: Refrigerator The pr...

Function of heat pump: Refrigerator The primary function of heat pump is to transfer heat from the low temperature system to the high temperature system, this transfer of

Types of brake , Types of Brake The brakes used in motorcycles can be ...

Types of Brake The brakes used in motorcycles can be classified as follows: (a) Drum Brake (b) Disc Brake

Explain gear forming, Explain Gear Forming In gear form cutting, cuttin...

Explain Gear Forming In gear form cutting, cutting edge of the cutting tool has a shape similar with the shape of the space among the gear teeth. Two machining operations, mill

CRANK SHAFT, TO FIND THE MAGNITUDE OF CRANK SHAFT

TO FIND THE MAGNITUDE OF CRANK SHAFT

Eng chemistry, write notes on internal treatement of water

write notes on internal treatement of water

What do you understand by inversion of mechanism, (a) What do you understan...

(a) What do you understand by Inversion of Mechanism ? Describe in detail the following : (i) Crank and Lever mechanism (ii) Double crank Mechanism (b) What are the condit

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