1. Machine Component Design
EMD223
Machine Component Design
Dr. Mohamad Yusof Idroas
Room: 3.10 (SoME)

2. 31/5: Final report submission
EMD223
Important Dates
Test #2
24 May 2012 (Thu)
2pm – 4pm
Project #2
30/5-31/5: Presentation
31/5: Final report submission

3. To be uploaded in eLearning
EMD223
Assignment #2
To be uploaded in eLearning
by15 May 2012 (Tue)
Due Date:
21 May 2012 (Mon)

4. Clutches, Brakes &
Flywheels

5. Introduction BAND BRAKES The SIMPLEST braking devices
A band brake is a primary or secondary brake, consisting of a
band of friction material that tightens concentrically around a
cylindrical piece of equipment to either prevent it from rotating (a
static or "holding“ brake), or to slow it (a dynamic brake). The band
is usually made of steel and lined with a woven friction material for
flexibility.
What is jiggering process?
Jiggering is a motion in which the clay bat is formed by means of templates or rollers. The jiggering process is limited to axisymmetric parts and has limited dimensional accuracy. Automation of this process is necessary to improve productivity.
The layered structure of clay can be formed with anisotropic behavior of the material both in subsequent processing and in the final properties of the ceramic products
What is anisotropy?
What is anisotropic behavior?
Figure 1: Band Brake

6. Introduction ADVANTAGES OF BAND BRAKES:
Band brakes can be simple, compact, rugged, and can
generate high force with a light input force.
DISADVANTAGES OF BAND BRAKES:
Band brakes are prone to grabbing or chatter and loss of
brake force when hot.
APPLICATIONS:
Chain saws, bicycle brakes, winch drums
Locking of gear rings in epicyclic gearing
What is jiggering process?
Jiggering is a motion in which the clay bat is formed by means of templates or rollers. The jiggering process is limited to axisymmetric parts and has limited dimensional accuracy. Automation of this process is necessary to improve productivity.
The layered structure of clay can be formed with anisotropic behavior of the material both in subsequent processing and in the final properties of the ceramic products
What is anisotropy?
What is anisotropic behavior?

7. Epicyclic (Planetary)
Introduction
APPLICATIONS:
What is jiggering process?
Jiggering is a motion in which the clay bat is formed by means of templates or rollers. The jiggering process is limited to axisymmetric parts and has limited dimensional accuracy. Automation of this process is necessary to improve productivity.
The layered structure of clay can be formed with anisotropic behavior of the material both in subsequent processing and in the final properties of the ceramic products
What is anisotropy?
What is anisotropic behavior?
Epicyclic (Planetary)
Gear Train
Winch Drum

8. Design Analysis
Based on Figure 1, friction forces acting on the band serve
to increase P1 and decrease P2.
Consider drum and band portion as a free body above the
cutting plane, brake torque (T) is determined as:
What is jiggering process?
Jiggering is a motion in which the clay bat is formed by means of templates or rollers. The jiggering process is limited to axisymmetric parts and has limited dimensional accuracy. Automation of this process is necessary to improve productivity.
The layered structure of clay can be formed with anisotropic behavior of the material both in subsequent processing and in the final properties of the ceramic products
What is anisotropy?
What is anisotropic behavior?
Figure 1: Band Brake

9. Design Analysis The applied lever force (F):
Forces acting on an element of the band for small angle dϴ
(based on Figure 2):
What is jiggering process?
Jiggering is a motion in which the clay bat is formed by means of templates or rollers. The jiggering process is limited to axisymmetric parts and has limited dimensional accuracy. Automation of this process is necessary to improve productivity.
The layered structure of clay can be formed with anisotropic behavior of the material both in subsequent processing and in the final properties of the ceramic products
What is anisotropy?
What is anisotropic behavior?
Figure 2: Forces on a band element (width = b)

10. Design Analysis Integrating Eqn. n over the length of contact gives:
What is jiggering process?
Jiggering is a motion in which the clay bat is formed by means of templates or rollers. The jiggering process is limited to axisymmetric parts and has limited dimensional accuracy. Automation of this process is necessary to improve productivity.
The layered structure of clay can be formed with anisotropic behavior of the material both in subsequent processing and in the final properties of the ceramic products
What is anisotropy?
What is anisotropic behavior?

11. Design Analysis The maximum normal pressure pmax acting on the band
occurs at ϴ = ϕ, where P = P1.
Applying Eqns. l and m to this point gives:
What is jiggering process?
Jiggering is a motion in which the clay bat is formed by means of templates or rollers. The jiggering process is limited to axisymmetric parts and has limited dimensional accuracy. Automation of this process is necessary to improve productivity.
The layered structure of clay can be formed with anisotropic behavior of the material both in subsequent processing and in the final properties of the ceramic products
What is anisotropy?
What is anisotropic behavior?

12. Design Analysis DIFFERENTIAL BAND BRAKE
Attach fixed end of the band to the lever at the opposite of
the pivot gives greater self-energizing action as shown in
Figure 3.
The force F for the differential band brake:
What is jiggering process?
Jiggering is a motion in which the clay bat is formed by means of templates or rollers. The jiggering process is limited to axisymmetric parts and has limited dimensional accuracy. Automation of this process is necessary to improve productivity.
The layered structure of clay can be formed with anisotropic behavior of the material both in subsequent processing and in the final properties of the ceramic products
What is anisotropy?
What is anisotropic behavior?
Figure 3: Differential band brake

13. Design Analysis PONY BRAKE TEST
Used in determining brake power of the engine (esp. low
power engine)
What is jiggering process?
Jiggering is a motion in which the clay bat is formed by means of templates or rollers. The jiggering process is limited to axisymmetric parts and has limited dimensional accuracy. Automation of this process is necessary to improve productivity.
The layered structure of clay can be formed with anisotropic behavior of the material both in subsequent processing and in the final properties of the ceramic products
What is anisotropy?
What is anisotropic behavior?
Figure 4: Pony brake test

14. Design Analysis PONY BRAKE TEST What is jiggering process?
Jiggering is a motion in which the clay bat is formed by means of templates or rollers. The jiggering process is limited to axisymmetric parts and has limited dimensional accuracy. Automation of this process is necessary to improve productivity.
The layered structure of clay can be formed with anisotropic behavior of the material both in subsequent processing and in the final properties of the ceramic products
What is anisotropy?
What is anisotropic behavior?

15. Design Analysis PONY BRAKE TEST What is jiggering process?
Jiggering is a motion in which the clay bat is formed by means of templates or rollers. The jiggering process is limited to axisymmetric parts and has limited dimensional accuracy. Automation of this process is necessary to improve productivity.
The layered structure of clay can be formed with anisotropic behavior of the material both in subsequent processing and in the final properties of the ceramic products
What is anisotropy?
What is anisotropic behavior?

16. Thank You