A Project Report Abstract : A crank and kinematic links are designed in such way that it can be excited by electric motor for operating the automated cradle machine. By just switching ON the motor the cradle will swing and stops when switched OFF. This cradle is a typical one. This cradle varies from the traditional ones by hanging under the ceiling. This auto swing cradle is designed in such a way that it can be operated at a load of about 30 kg and the safety precautions are followed. This device is more compact and does not need any space on the floor. This type of cradle that hangs under the is the maiden attempt.

1. Sl.no CONTENTS PAGE.NO
1. INTRODUCTION
2. 12V-DC MOTOR
3. BEARING
4. KINEMATIC LINKS
5. MANUFACTURING PROCESS
6. PART DRAWING
7. DESING OF VARIABLE COMPONENTS
8. FABRICATION
9. ASSEMBLEY
10. PHOTOCOPY
11. COST ANALYSIS
12. CONCLUSION

2. 1.INTRODUCTION:
In our project, we are mainly concerned about the needs of the common
family. It is mother, who plays vital role in taking care of babies. Taking a
baby to sleep is a tedious process. If it is not carried out in a proper way, then
the whole family has to accompany with the baby for full night.
At present, the cradle (or) swing is essential for the baby’s sleep. But it is
such an enormous duty for the mothers. This paves a way for weakening of
strength, stress, depression for them. This brings chaos and unpleasant
atmosphere at home, living of many families proved it right.
The allergy of swinging the cradle is prevailing in most families, where both
parents are employees. This injects the grievance between the couple. To
bring a solution to these, a baby cradle is designed.
This baby cradle is a typical model that resembles the traditional model
which is fixed over the tree branches. This baby cradle operates electricallyat
low power. For the convenience of the parents, it can be operated by remote.
Can be switched –off if not necessary. It consists of various features
including speed variation, automatic sensing and can be operated manually
too.
In these ways, this cradle pleases the mothers. This device reduces the major
part in the art of baby caring. And we hope that our model will bring a
pleasant atmosphere and an adorable maternal-child and a family
environment.

3. 2. 12-V DC MOTOR
Item specifications
standard: 30W 12V
Voltage: 12V
Motor: Brush
Type: DC Motor
Braking torque: 26N/m
Working torque:5N/m
Working speed:
I. Non- load speed: Min-35 rpm
Max-52 rpm
II. With load-30 to 45 rpm
Use: Wiper
color: black painted
gear material: aluminium
Application: ZD1332 / ZD2332 Lifting motor
material: stainless steel
Wiring: 2/4 wires
Specifications
1. Low noisy with high technical
2. OE quality
3. CE ISO9001 TS16949
FUNCTION
1.20W 12V wiper motor for Medical Equipment Motor
2. OEM Quality
3. Producing various wiper motors under your required parameter.
4. ISO9001:2000 ,ISO/TS16949:2002 international quality management
system certification.
5. Repairs can be easilydiagnosed.
6. The quality is reliable.And the product is tough and durable.

4. 3. BEARING
A bearing is a machine element which supportanother moving
machine element (know as journal) it permits a relative motion between the contact
surface of the member of the members while carrying load.
NECESSITYOF BEARING:
 To reduce the amount of power wasted in overcoming frictional resistance
 To prevent the wear of rotating components.
CLASSIFICATION OF BEARING
 Direction of load to be supported
 Radial bearing
 Thrust bearing
 Nature of contact
 Sliding contact bearing
 Rolling contact bearing
TYPES OF ROLLING CONTACT BEARING:
 Ball bearing : Balls are placed between inner and outer races.
 Roller bearing: Rollers are placed between inner and outer races.

5. TYPES OF RADIAL BALL BEARING
 Single row deep groove bearing:
This type is used for carrying high load and for
high running speeds.
 Filling notch bearing :
Since this type of bearing contains larger number of
balls than a corresponding unnotched one therefore it has large bearing
load.
 Angular contactbearing:
This bearing carries a relatively large axial load in one
direction while also carrying a relatively large radial load.
 Double row bearing :
The load capacity of this type is slightly less than
twice that of a single row bearing.
 Self aligning be these bearing permits shaft deflection within 2° − 3°.
MATERIAL :
 The balls are generally made of high carbon chromium steel.
 The material of both the ball and races are heat treated to give extra hardness
and roughness.

6. LUBRICATION:
 To reduce friction and wear between the rolling parts of bearing .
 To prevent rusting or corrosionof the bearing surfaces.
 To protect the bearing surfaces from water ,dirt ,etc
 To dissipate the heat.
ADVANTAGES OF ROLLING CONTACT BEARING:
 Low starting and running frication except at very high speed.
 Ability to withstand momentary shockloads.
 Accuracy of shaft alignment.
 Low costof maintenance as no lubrication is required while in service.
 Reliability of service.
DISADVANTAGES:
 Designing of bearing housing complicated.
 Low resistance to shock loading.
 More initial cost.

7. 4. KINEMATIC LINKS OR ELEMENTS
Introduction:
A machine consisits of a number of parts or bodies.
We shall discuss the mechanism of the various parts of the bodies from which
the machine is assembled. This is done by making one of the part is fixed and
the relative motion of other parts is determined with respect to the fixed part.
Kinematic link or element:
Each part of the machine which move relative to the some other part is
known as kinematic link or element. A link may consist of several parts
which are rigidly fastened together so that they don’t move relative to one
another. For example, in a reciprocating steam engine, piston , piston rod, &
cross head constitute of one link. Connecting rod with bis and small ends and
bearings constitute a second link, crank, crank shaft, flywheel are in third link
and the cylinder, cylinder engine frame main bearing are in fourth link.
Resistant body:
A link or element need not to be a rigid body, but it must be a resistant body.
A link should have a two characters given below:
 It should have relative motion.
 It must be a resistant body.

8. Types of links:
 Rigid link
 Flexible link
 Fluid link.
In our project, we use only Rigid Links.
Rigid links:
A Rigid link is one in which does not undergo any deformation, while
transmitting a motion. As the deformation of the connecting rod, crank
etc.,. of a reciprocating steam engine is not applicable, thry can be
considered as a rigid link.
Structure:
It is a of number of resistant body(known as members) have no relative
motion between them and meant for carrying load having straining action.
Kinematic pair:
The two links or element of a machine when in contact with each other
they are said to form a pair, if the relative motion between them is
completely or successfully constrained pair is known as kinematic pair.
Classification of kinematic pairs:
 Sliding pair
 Turning pair
 Rolling pair
 Screw pair

9.  Spherical pair
In our project, we are mainly concerned about the sliding pair,
rolling pair and screw pairs only.
I. Sliding pair:
When the two elements of a pair are connected in such a way, that
one can slide relative to another.
II. Rolling pair:
When the two elements of a pair are connected in such a way, that
one can roll over another fixed link is known as rolling pair.
III. Screw pair:
When the two elements of a pair are connected in such a way, that
one element can turn about other by screw threads is known as
screw pair.

10. 5. MANUFACTURING PROCESS
MANUFACTURING PROCESS CHART
PRIMARY CUTTING PROCESS
MACHINING PROCESS
SURFACE FINISHING PROCESS
OPERATIONS INVOLVED
 Facing
 Drilling
 Gas cutting
 Shaping
 Welding
 Revetting
 Thread cutting
ASSEMBLING PROCESS

11. FACING
Machining the end of the workpiece to produce flat surface is called
facing. Due to this, the plate can get flat surface have done by facing
operation.
DRILLING
Drilling is operation of producing cylindrical hole in the workpiece. It is
done by rotating the cutting edge of the cutter known as drill bit. In our
project the drilling is done on the clamp for inserting the bolt and screw
rod.
SHAPING
The process of shaping the job for required dimension using shaping
machine is known as shaping. This is done in the MS plane to make steps.
WELDING
The process of joining two similar or dissimilar metals is known as
welding. It is done between the steps and base.
THREAD CUTTING
Thread cutting is the operation of forming external thread of required

12. diameter of rod by using a multipoint tool is called thread. This process is
used in strap clamp to done on the rod which is used for the movement of
the clamp up and down.
MANUFACTURING PROCESS
PRIMARY CUTTING PROCESS
The process used for preliminary cutting of the component are
known as primary cutting process . The common operations involved in
this process are gas cutting , sawing etc.
MACHINING PROCESS
The process used for giving final shape to the component
according to the planned dimension is known as machining process . The
common processes involved in this process are turning , planning, shaping ,
drilling , etc.
SURFACE FINISHING PROCESS
The process used to provide a good surface finish for the
components are called as surface finishing process . The common
operations used for this process are polishing , buffing , abrasive belt
grinding , super finishing etc.

13. JOINING PROCESS
The processes used to join the components are known as joining
process . The common operations used for this process are welding ,
riveting , brazing , screw fastening, pressing etc.
GENERAL PROCEDURE OF DESIGN
RECOGANISATION OF NEED
First of all, make a complete statement of the problem, indicating the
Need, aim or purpose for which is to be designed .
SYNTHESIS(MECHANISM)
Select the possible mechanism or group of mechanism which will
give the desired motion.
ANALYSIS OF FORCES
Find the forces acting on the each member of the machine and
energy transmitted by the each member.
MATERIAL SELECTION
Select the material best suited for each member of the machine.

14. DESIGN OF ELEMENTS (SIZE AND STRESSES)
Find the size of each member of the machine by considering the
forces acting on member and the permissible stress for the material used.
MODIFICATION
Modify the size of the member to agree with the past experience
and judgment to facilitate manufacture . The modification may also be
necessary by consideration of manufacturing to reduce overall cost.
DETAILED DRAWING
Draw the detailed drawing of each component of each assembly of
the machine with complete specification for the manufacturing process
suggested
PRODUCTION
The component , as per the drawing , is manufactured in the
workshop.

15. PROCESS CHART
Part name operations Machine used Materials used
1Base The M.S
plate of
rough size is
cut &shaped
to finish size
Gas cutting m/c Mild steel
2.Fixed arm The M.S
square of
rough size is
cut &
shaped to
finish size
Shaping m/c
Drilling m/c
Mild steel
3.Extended arm The M.S
square is cut
to require
size.
Gas cutting m/c
Shaping m/c
Forging m/c
Mild steel
4.Hinged eye
bolt & nut
The M.S rod
is turned
faced &
drilled to
require
diameter.
Lathe
Drilling &
Threading
Mild steel
5.Supporting
arm
The M.S
square of
rough size is
cut &
shaped to
finish size
Gas
Cutting ,shaping
m/c,drilling m/c
Mild steel
For assembling of parts, welding has been done where ever necessary

16. 6. PART DRAWING
1.Base Plate:
2. Extended Arm:

17. 3.Hinged Eye Nut:
4.Bolt:

18. DESIGN CALCULATION
8.FABRICATION:
 Shafts are turned using lathe.
 Threads are cut using lathe.
 Bearing block drilling, boring using lathe.
 Extended arm bending by forging.
 Base plate drilling using mechanical hand driller.
 Base plates are cut using mechanical saw.
 Nut-cum-hanger is bent by forging..
9.ASSEMBLY OF AUTOMATIC BABY CRADLE
COMPONENTS:
 Base plate if fitted with steel plate
 Location of input shaft and output shaft sketched using pencil on the base
plate.
 Motor is bolted to the baseplate.
 Bearing is fixed on the motor crank.
 Fixed arm is placed on base plate.
 Input and output shaft are tight fitted in the bearing
 Transformer connected in the L-angle
 Base plate is welded with steel plate
 Extended arm is fixed in the fixed arm.

19. ASSEMBLED IMAGE:-

20. PHOTOCOPY

21. COST ANALYSIS
S.NO PART MATERIAL SPECIFICATION QUANTITY COST
(RS)
1 Extended
rod
Mild steel Length=1200mm
width=12mm
1 100
2 DC Motor 12V, 2 amps
Rated speed=32-
52 rpm
1 400
3 Transformer 6V, 6-0-6, 2 amps 1 150
4 Fixed arm Mild steel Diameter=17mm
Length= 50mm
1 30
5 Bearing High carbon
steel
Skf 6306 2 100
6 L-angle Mild steel Thickness=3mm 1 20
7 Base plate Mild steel 200*150*2mm 1 100
8 Bolts and
nuts
Mild steel M8 2 20
9 Machining cost 500
10 Total 1420

22. CONCLUSION:
In this project, we have performed and understood the following
 Kinematic links placements were calculated.
 Base plate and fixed arm are designed theoretically.
 Mechanisms were designed practically.

23.  Materials were selected for various components considering the
design and the safety factors.
We learned
 How to plan a process?
 How to relate theories to practical work?
 Lot of practical notions
 How to tackle difficulties practically and overcome it.
 Technical terms and notion used in workshop.
We also conclude here by that, this cradle pleases the common
family.This device reduces the major part in the art of babycaring. And we
hope that our model will bring a pleasant atmosphere and an adorable
maternal-child and a familyenvironment.