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

Determine the moment of resistance of the beam, Determine the moment of res...

Determine the moment of resistance of the beam: A circular beam of diameter 100 mm is subjected to bending. The maximum bending stress is restricted to 50 N/mm 2 . Determine t

Discover the maximum safe air pressure, Discover the maximum safe air press...

Discover the maximum safe air pressure: A cylindrical compressed air drum is equal to 2 m in diameter along plates 12.5 mm thick. The efficiencies of the longitudinal (η l ) a

Design pumps for plant layout, Q. Design Pumps for plant layout? Pumps ...

Q. Design Pumps for plant layout? Pumps handling flammable or combustible materials are relatively frequent sources of leakage and should therefore be located as far as practic

Steel ball v/s cotton ball, steel ball v/s cotton ball of same weigt which ...

steel ball v/s cotton ball of same weigt which is easy to lift

Bore - thermodynamics, Bore - Thermodynamics: The inner diameter of en...

Bore - Thermodynamics: The inner diameter of engine cylinder is called as bore. It can be measured by a vernier calliper or bore gauge. As engine cylinder wears out with the p

Bearing bronzes, Bearing Bronzes This is the copper-tin alloys along w...

Bearing Bronzes This is the copper-tin alloys along with small additions of another constitution. Beneath conditions of heavy load and conditions of severe service, bronzes ar

Design data of screw conveyor with auger, DESIGN FACT DATA: ?A) Torque...

DESIGN FACT DATA: ?A) Torque capacity for traction motor of screw conveyor-1660 N-m. ? B) RPM of Traction motor-115 rpm. ? C) Pressure require for operating the telescopi

__, what is magnetostriction?

what is magnetostriction?

Constituents of seam welding, Constituents of seam welding The essentia...

Constituents of seam welding The essential elements of a seam welding machine are: Main frame containing welding transformer and tap switch. Welding head consisting o

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