In: Mechanical Engineering

how to produce a bolt using traditional methods ?

**Bolts producing using traditional methods**

They are five stages to produce bolt

- Heading
- External threading (rolling)
- Heat treatment process
- Tempering
- Galvanization

**1.Heading**

- The first process is a cold foring process is called heading.
- It is used to produce a near net shape work billet.
- The ratio usually is limited to less than 3:1 but appropriate dies, it can be higher.
- The production method is probably used because cold heading has a very high production rate and produce virtually no waste material.The bar stock is fed into a machine called former. The bar stock is stopped and then gripped by a gripping die. The shape of the rounded head is based on which type die is used. Rounded headed shape form on bolt based on gripping die and it shaped in such a way that it forms a carriage along the neck of the stock whem its full gripping force applied on it.

**2. External threading (rolling)**

- The stage is thread rolling process is applied to the bottom of the work billet is a deformation process known as thread rolling.
- The thread rolling process is usually chosen over machining because thread rolling provides higher productions with accuracy.
- The type of process applied is cold forming process is used in cylinderical parts can easily have thread applied by rolling the work billet through two dies.

**3.Heat treatment process**

- Quenching is the mechanical process of heating and rapid cooling of workpieces (bolt) in water, oil, or ait to obtain certain material properties.
- Used to strengthening and harding of steel materials
- The material is then often tempered to reduced the brittleness that may increase from the quench hardness process.

**4.Tempering**

- Tempering is a process of heat treating which is used to increase the toughness of iron based alloys.
- Tempering is usally performed after hardenin to reduce some of the excess hardness.

**5.Galvanization**

- Galvaning is the process of applying a protective zinc coating to steel or iron to prevent rusting.
- The most common method is hot dip galvanizing in which parts are submerged in a bath of molten zinc.

Using traditional methods it takes 11.1 hours to receive a basic
driving license. A new license training method using Computer Aided
Instruction (CAI) has been proposed. A researcher used the
technique on 26 students and observed that they had a mean of 11.6
hours with a standard deviation of 1.6. Is there evidence at the
0.1 level that the technique performs differently than the
traditional method? Assume the population distribution is
approximately normal.
State the null and alternative hypotheses.
Find...

#1: Using traditional methods it takes 100 hours to receive an
advanced driving license. A new training technique using Computer
Aided Instruction (CAI) has been proposed. A researcher believes
the new technique may reduce training time and decides to perform a
hypothesis test. After performing the test on 190 students, the
researcher fails to reject the null hypothesis at a 0.02 level of
significance.
#2:
The director of research and development is testing a new drug.
She wants to know...

Using traditional methods it takes 92 hours to receive an
advanced flying license. A new training technique using Computer
Aided Instruction (CAI) has been proposed. A researcher used the
technique on 70 students and observed that they had a mean of 93
hours. Assume the population variance is known to be 36. Is there
evidence at the 0.050.05 level that the technique lengthens the
training time?
Step 2 of 6 :
Find the value of the test statistic. Round your...

Using traditional methods it takes 8.2 hours to receive a basic
flying license. A new license training method using Computer Aided
Instruction (CAI) has been proposed. A researcher used the
technique on 26 students and observed that they had a mean of 8.0
hours with a variance of 2.89 . Is there evidence at the 0.1 level
that the technique reduces the training time? Assume the population
distribution is approximately normal. Step 1 of 5: State the null
and alternative...

Using traditional methods, it takes 8.1 hours to receive a basic
driving license. A new license training method using Computer Aided
Instruction (CAI) has been proposed. A researcher used the
technique with 14 students and observed that they had a mean of 8.3
hours with a standard deviation of 1.1. A level of significance of
0.05 will be used to determine if the technique performs
differently than the traditional method. Assume the population
distribution is approximately normal. State the null...

using traditional methods it takes 102 hours to receive an
advanced flying license. A new training technique using computer
aided inctruction has been proposed. A researcher used the
technique on 60 students and observed that they had a mean of 100
hours. Assume the population variance is known to be 36. Is there
evidence at the 0.05 level of the technique performs differently
than the traditional method?
what is H0 =?
what is Ha=?
what is the value of the...

Using traditional methods it takes 103 hours to receive an
advanced driving license. A new training technique using Computer
Aided Instruction (CAI) has been proposed. A researcher used the
technique on 230 students and observed that they had a mean of 104
hours. Assume the population variance is known to be 49. Is there
evidence at the 0.1 level that the technique lengthens the training
time?
Step 1 of 6 :
State the null and alternative hypotheses.

Using traditional methods it takes 102 hours to receive an
advanced flying license. A new training technique using computer
aided instruction (CAI) has been proposed. A researcher used the
technique on 60 students and observed that they had a mean of 100
hours. Assume the population variance is known to be 36. Is there
evidence at the 0.05 level that the technique performs differently
than the traditional method?
Question to answer:
H0: ?
Ha= ?
Find the value of the...

Using traditional
methods, it takes 11.211.2 hours to receive a basic driving
license. A new license training method using Computer Aided
Instruction (CAI) has been proposed. A researcher used the
technique with 2525 students and observed that they had a mean of
11.311.3 hours with a variance of 4.004.00. A level of significance
of 0.050.05 will be used to determine if the technique performs
differently than the traditional method. Assume the population
distribution is approximately normal. Make the decision to...

Using traditional methods, it takes 8.48.4 hours to receive a
basic flying license. A new license training method using Computer
Aided Instruction (CAI) has been proposed. A researcher used the
technique with 1616 students and observed that they had a mean of
8.28.2 hours with a variance of 1.001.00. A level of significance
of 0.050.05 will be used to determine if the technique performs
differently than the traditional method. Assume the population
distribution is approximately normal. Find the value of...

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