Time and cost analysis, Mechanical Engineering

Assignment Help:

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 broadly are Processing and assembly operations, Material handling, Inspection and testing and Coordination and control.

The machining times for various machining processes and the importance of it is explained.

The machining time in turning (t) is as

t = L + L0 /2 f N

The machining time in milling T in minutes can be calculated as

T = (L × n)/ f Z N minutes

Time for drilling the hole = L/ f N     minutes

Machining Time = Depth of hole to be bored in mm minutes/ N × feed/rev

where, N = No. of revolutions per min. of machine spindle or work.

In boring operation the machining time is calculated the same manner as in turning. It is given by the following relation :

Machining Time = Depth of hole to be bored in mm minutes/ N × feed/rev

where, N = No. of revolutions per min. of machine spindle or work. Machining time for shaping can be calculated as below.

No. of cycles required (n) = Shaping width / Feed per cycle f

= B/f

Machining time = No. of cycles × time required for each cycle

1428_Time and Cost Analysis.png

The machining time (T) in cylindrical grinding can be calculated from the following relationship.

T = (L . P . K )/ ( f . N . t) min .

The total production cost of machined components is made up of the following components : material cost, labour cost, overhead cost, tool cost and cost of percent of the total cost. But the influence of tools on the other costs is considerable. It is often possible that the tool cost is increased but the total production cost is reduced considerably because of the influence of the tool on other aspects of cost.

The costs that go into machining a part can be broken into three categories as Material removal cost, Tool cost and Non-productive cost

Total machining cost = Material removal cost + Tool cost + Non-productive cost. The tool cost is made up of

(a) Tool change cost (TCC) or cost for indexing the insert

(b) Tool regrinding cost (TRC)         

(c)  Tool original cost (TOC)

(d) Tool inventory cost (TIC)

Total tool cost = TCC + TRC + TOC + TIC


Related Discussions:- Time and cost analysis

Determine the location of the hydraulic jumps - water depths, Problem: In H...

Problem: In HEC-RAS, model this system as 1 reach with cross-sections every 2 ft. For all 3 discharges (labeled as: design, low, flood), (a) Determine the water depths 10 ft fro

Unsymmetrical bending, how to culculate stress in unsymmetrical bending

how to culculate stress in unsymmetrical bending

Stainless steels, Stainless Steels Such are particularly termed for t...

Stainless Steels Such are particularly termed for their resistance to corrosion. This resistance is acquired due to formation of protective oxide layer that spreads all over

Derive the expression of torque in closely excited system., Q.   Derive the...

Q.   Derive the expression of torque developed in closely excited magnetic system. Clearly explain then assumption made.   Sol. Double - Excited System   A doubly - ex

What is the tessellated modellers, Tessellated Modellers    Solid Model...

Tessellated Modellers    Solid Modeling This describes a class of simplified boundary-representation modellers which approximate to curved faces by a number of plane faces. Sin

THERMODYNAMICS, what is second law of thermodynamics

what is second law of thermodynamics

Design standards - planning a new airport , Design Standards: The fol...

Design Standards: The following design standards for a modern airport facility catering to latest models of aircraft may be noted for guidance.

Define Disadvantages of electro discharge machining, Define Disadvantages o...

Define Disadvantages of electro discharge machining? a) The wear rate on the electrode is significantly higher. b) The work piece must be electrically conductive to be machi

Importance of molliers diagram, Describe the key terms i. Write two diff...

Describe the key terms i. Write two differences between turbine and boiler. ii. Write importance of mollier's diagram iii. Compare the rankine cycle with carnot cycle in k

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