Calculate the actual machining time, Mechanical Engineering

Calculate the Actual Machining Time

Estimate the actual machining time required for the component of diameter 42 mm and length 120 mm. The available speeds are 70, 110, 176, 280, 440, 700, 1100, 1760 and 2800. Use a roughing speed of 30 m/min and finish speed of 60 m/min. the feed roughing is 0.24 mm/rev. while that for finishing is 0.10 mm/rev. The maximum depth of cut for roughing is 2 mm. Finish allowance might be taken as 0.75 mm. Blank to be utilized for machining is 50 mm in diameter.

Solution

Stock to be removed = (50 - 42)/4 = 4 mm

Finish allowance = 0.75 mm

Roughing

Stock available = 4 - 0.75 = 3.25 mm

Since maximum depth of cut to be taken is 2 mm, there are two roughing passes.

Given cutting speed V = 30 m/min

Average depth of cut = (50 + 42)/2 = 46 mm

Spindle speed N = (1000 × 30) / (π× 46) = 207.59 rpm

The nearest rpm available from the list is 176 rpm as 280 is very high compared to 207 as calculated.

Machining time for one pass =(120 + 2) / (0.24 × 176) = 2.898 minutes

Finishing

 Given cutting speed V = 60 m/min

 Spindle speed N = (1000 × 30)/ (π× 42)  = 439.05 rpm

The nearest rpm available from the list is 440 rpm

Machining time for one pass = (120 × 2 )/ (0.10 × 440)

                                                  = 2.77 minutes

Total machining time = 2 × 2.888 + 2.77 = 8.546 minutes

Posted Date: 12/24/2012 4:49:12 AM | Location : United States







Related Discussions:- Calculate the actual machining time, Assignment Help, Ask Question on Calculate the actual machining time, Get Answer, Expert's Help, Calculate the actual machining time Discussions

Write discussion on Calculate the actual machining time
Your posts are moderated
Related Questions
Spot and projection welding machines On the basis of the mechanical construction, resistance spot welding machines can be of four types viz. rocker arm, press, portable and mul

Q What do you know about Series welds in spot welding? It is a welding method in which two or more spots are produced simultaneously with only one common but indirect current p

There are various refrigeration systems employing various methods. State any seven (7) refrigeration systems, mention the method(s) employed to attain low temperatures, and state a

Give justification toward the development of rapid prototyping?

have assignment in FEM calculation and ANSYS are you able to solve this kind of assignment

Priority Rules A main concern rule is an algorithm that evaluates a priority number PN j for all operation j which enters the queue in front of a station (processing, cell, wo

details of form tool

mostly what aspects trouble mechanical engineers?

Find out the thickness of the metal and the hoop stress: The cylinder of a hydraulic press has an internal diameter of 0.3 m & is to be designed to withstand a pressure of 10

comparing the different coding systems ?