Two output devices that you know

A drilling operation is to be performed with a 12.7 mm diameter drill on cast iron. The hole depth is 60 mm and the drill point

Gnoma [55]

Answer:

a. Tm = 0.3192min.

b. MRR = 396.91mm^{3}/s.

Explanation:

Given the following data;

Drill diameter, D = 12.7mm

Depth, L = 60mm

Cutting speed, V = 25m/min = 25,000m

Feed, F = 0.30mm/rev

To find the cutting time;

Cutting time, Tm =?

$Tm = \frac{L}{Fr}$ .......eqn 1

We would first solve for the feed rate (F);

$Fr = NF$ .......eqn 2

But we need to find the rotational speed (N);

$N= \frac{V}{\pi *D}$

$N= \frac{25000}{3.142*12.7}$

$N= \frac{25000}{39.90}$

N = 626.57rev/min.

Substiting N into eqn 2;

$Fr = NF$

Fr = 626.57 * 0.30

Fr = 187.97mm/min.

Substiting F into eqn 1;

$Tm = \frac{L}{Fr}$

$Tm = \frac{60}{187.97}$

Tm = 0.3192min.

Therefore, the cutting time is 0.3192 minutes.

For the material removal rate (MRR);

$MRR = \frac{\pi *D^{2}Fr}{4}$

$MRR = \frac{3.142*12.7^{2}*187.97}{4}$

$MRR = \frac{3.142*161.29*187.97}{4}$

$MRR = \frac{95258.16}{4}$

$MRR = 23814.54mm^{3}/min$

Time in seconds, we divide by 60;

MRR = 23814.54/60 =396.91mm^{3}/s.

Therefore, the material removal rate (MRR) is 396.91mm^{3}/s.

4 0

3 years ago

A drum contains 3 black balls, 5 red balls and 6 green balls. If 4 balls are selected at random what is the probability that the

posledela

Answer:

Probability of no red ball from 4 balls = 0.1258 (Approx.)

Explanation:

Given:

Number of black ball = 3

Number of red ball = 5

Number of green ball = 6

Find:

Probability of no red ball from 4 balls

Computation:

Probability of no red ball from 4 balls = 9c4 / 14c4

Probability of no red ball from 4 balls = 126 / 1001

Probability of no red ball from 4 balls = 0.12587

Probability of no red ball from 4 balls = 0.1258 (Approx.)

6 0

3 years ago

What is Electrical resistance welding basic principles

patriot [66]

According to the basic principles of Electrical Resistance Welding, Resistance welding is used to fuse two metals together. See further explanation below.

<h3>Principles of Electrical resistance welding</h3>

It is to be noted that Electrical Resistance Welding comprises a welding head that exerts pressure and holds the metal between its electrodes, as well as a welding power source that applies electric current to the metal to be welded. When force is exerted, resistance creates friction heat.

A weld is a metal coalescence formed by heating to an appropriate temperature with or without pressure, and with or without the introduction of a filler substance.

Resistance welding bonds are classified into three types:

solid state,
fusion, and
reflow braze.

Different materials having dissimilar grain structures, such as molybdenum to tungsten, are bonded utilizing a relatively short heating time, high weld energy, and high force in a solid state bond, also known as a thermo-compression bond.

Learn more about Welding:
brainly.com/question/4695733
#SPJ1

5 0

1 year ago

PDC Bank is working on creating an AI application that enables customers to send SMS to the AI application to allow banking acti

bogdanovich [222]

The kind of attack that the PDC Bank application is subjected to due to compromised data is: Adversarial artificial intelligence

Adversarial artificial intelligence is a form of attack on a neural network where a wrong algorithm is entered into the system to deceive the end user.

The aim of this machine learning method is to deceive the end user.

This is what happens to the PDC Bank when its data was compromised in the course of improving the machine learning accuracy.

Learn more about Adversarial artificial intelligence here:

brainly.com/question/22190244

5 0

3 years ago

A gear train has two gears. The driver gear has 8 teeth and a diametral pitch of 6 teeth/inch. the follower gear has 24 teeth. W

Sliva [168]

Answer:

18 teeth/inch

Explanation:

Given that: i. driver gear has 8 teeth and diametral pitch of 6 teeth/inch.

ii. follower gear has 24 teeth.

Let the followers diametral pitch be represented by x.

Then,

8 teeth ⇒ 6 teeth/inch

24 teeth ⇒ x teeth/inch

So that;

x = $\frac{24 x 6}{8}$

= $\frac{144}{8}$

= 18 teeth/inch

The diametral is 18 teeth/inch

3 0

3 years ago

Two output devices that you know​

Two output devices that you know