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

Mechanical design calculations, Q. Mechanical Design Calculations? The ...

Q. Mechanical Design Calculations? The Mechanical Design Engineer/Specialist shall be responsible for mechanical design calculations that are required to ensure that the end pr

Time and cost analysis, Time and Cost Analysis This discusses about ce...

Time and Cost Analysis This discusses about certain basic activities that must be carried out in a factory to convert raw materials into finished products. These activities br

Determine the work transfer, If the expression is quasi-static, determine Q...

If the expression is quasi-static, determine Q, ΔU and W for the process. In another process the same system expands according to the similar pressure- volume relationship and f

Plate clutch pressure height-clutch slipping, Plate clutch pressure height ...

Plate clutch pressure height : Check plate clutch pressure leg height by placing the plate clutch pressure on the surface plate. Plate clutch pressure should not tilt on the surfa

Find the minimum weight to keep equilibrium, Find the minimum weight to kee...

Find the minimum weight to keep equilibrium: A belt supports the two weights W 1 an d W 2 over a pulley as shown in the figure given below. If W 1 = 1000N, fi

Fluids, show a schematic circuit diagram of a electric hydraulic gear pump...

show a schematic circuit diagram of a electric hydraulic gear pump with adjustable with one direction flow and explain the operation

What is floating foundations, What is Floating Foundations The settlem...

What is Floating Foundations The settlement of  foundations can be reduced if the applied load is compensated by excavation of a basement. This basement may be in the form of

Distribution of circumferential stress intensity, A thick cylinder 125 mm i...

A thick cylinder 125 mm inside diameter and 250 mm outside diameter is subjected to an internal fluid pressure of 50N/mm 2 . Determine the maximum and minimum intensities of circum

Statics, what are the applications of statics in engineering

what are the applications of statics in engineering

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