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TECHNOLOGIE AU COLLEGE

2 0 0 7

Test Stand

D-ROUL-EN

Related productsReal metal bearing and bike test bench.

This booklet may be copied for students for internal school use** This booklet may be copied as many times as necessary within school establishments for educational use only, on thecondition that the publisher’s name is included: A4. Copying or distribution for commercial use is not permitted withoutagreement from A4. Any copying or distribution of all or part of this booklet outside of school use is not permitted withoutagreement from A4.

SUMMARY

Project preparation 1Drawing overallAssembly drawingTeacher documentsStudent worksheets and answers

234

5 to 8

September 2007Etienne Bernot - Jean Luc Mathey

5, avenue de l’AtlantiqueZ.I. de Courtaboeuf

91940 Les UlisTél. : 01 64 86 41 00 - Fax. : 01 64 46 31 19

www.a4.fr

Published by A4 Company

Test stand

01

Presentation - Preparing the model from the kit supplied

1 - Assembly of the internal ringAssemble the two half-rings with the 8 3x13 screws

2 - Assembling the external ring Assemble the two half--rings with the 8 3x13 screws

3 - Making the ballsStick together two halves of balls which are different colours

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The screws must be screwed in completely but gently

drops of glue(glue provided in the kit)

The screws must be screwed in completely but gently

Teacher Document

PROJECT STEP

DOCUMENT TITLE

A4

Name

ClassSchool

Date

TECHNOLOGYAT SCHOOL

Exploded view

ASSEMBLY

NUMBER DESCRIPTION CHARACTERISTICS

1 01 External ring Man-made polyethylene 5002 01 Internal ring Man-made polyethylene 5003 09 Balls Injected ABS4 01 Cage Expanded PVC5 01 O-ring

Injected polyethylene

QUANTITY

02

6 03 Elastic rivets (large head)Crystal PVC

5

6

1

2

3

4

Teacher Document

PROJECT PART

DOCUMENT TITLE

A4

Name

ClassSchool

Date

TECHNOLOGYAT SCHOOL

Assembly

ASSEMBLY

03

1- Place the balls between the internal and external rings

2 - Space balls evenly

3 - Insert the cage between the balls

4 - Attach the transparent o-ring to the cage

Teacher Document

04www.a4.fr

Suggestions for learningThis model has been designed to enable study of ball bearings.

It will act as a guide for investigation when students discover ball bearings in objects that theystudy such as skateboards, bikes and scooters.

Some suggestions for learning

1 - Testing the ball bearing model: assembly and disassembly. Make a flowchart of the assembly steps, using the diagrams provided by the teacher.Note: Let students use the assembled bearing to work out the ‘trick’ for assembling anddisassembling it. Drawing and example of flowsheet on page 5.

.

2 - Identification of various components of the ball bearing. Technical vocabulary.Complete the exploded view and general vocabularyStudent worksheet page 8, use page 2 as the answers.

3 - Observations on the model and real steel bearing.Students test the ball bearing model as well as a real stainless steel bearing. Ask them about the following to guide their observations:- Role of the balls- Role of the ball cage- Role of the raceway- Draw a diagram: include the two raceways and balls.Make a table of comparison to compare the model with the real ball bearing: materials, setsteel cage, lubricant, gap between the external and internal ring cages.- Uses of ball bearings: List some technical objects which use ball bearings. You could useclassroom objects (tools and machinery, trucks, fans, computer table slides, various objects,bicycles,roller skates, skateboards, models...)

Student worksheet page 6, answers page 7.

Teacher Document

05 www.a4.fr

Order of Assembly

The correct order

1 - P

lace

bal

ls b

etw

een

exte

rnal

and

inte

rnal

cag

es

2 - S

pace

bal

ls e

venl

y

3 - I

nser

t the

cag

e

4 - A

ttach

the

trans

pare

nt

o-r

ing

to th

e ca

ge

5 - T

est t

o se

eif

it w

orks

Make a flowchart which shows the order of assembly by cutting and sticking the labelsin a notebook. Name each step.

Student Worksheet

Teacher Document

06www.a4.fr

Observations on the ball bearing using the model

1 - Role of the ballsBlock the internal cage with one hand and rotate the external cage with the other hand.Describe the movement of the balls.

5 - Using ball bearingsGive some examples of objects which use ball bearings.Why do we use ball bearings?

4 - Compare the model with the real metal bearingComplete this table of comparison (material, cage...)

3 - Role of the racewayHave a look at the raceways and draw a diagram of them.Why do they look like this?

2 - Role of the cageDisassemble the cage, block the internal cage with one hand and use the other hand tomake the external cage rotate several times.What do the balls do?What is the cage used for?

Raceway

Model Real metal bearingMaterialCageLubricationExternal/Internal cage gap

Student Document

07 www.a4.fr

Observations on the ball bearing: answers1 - Role of balls

Block the internal ring with one hand and rotate the external ring with the other hand.Describe the movement of the balls.The balls roll between the two rings, they move more slowly than the exterior ring

4 - Compare the model with the real metal bearingComplete this table of comparison (material, cage...)

2 - Role of the cageDisassemble the cage, block the internal ring with one hand and use the other hand tomake the external ring rotate several times.What do the balls do?What is the cage used for?After several turns of the external ring, most of the balls regroup. The job of the cageis to maintain the spacing of the balls.

3 - Role of the racewayHave a look at the raceways and draw a diagram of them.Why do they look like this?The shape of the raceways reflects the shape of the balls, it guides them, makes iteasier for them to roll and strengthens the two cages.

Raceway

Exterior ring

Interior ring

Ball Ø 20

Model Real metal bearingPVC, Polyethylene, ABS SteelMaterialAsymmetrical,removable Symmetrical, set ,unremovableCagenone GreaseLubricationimportant gap NoneExt/Int cages gap

Teacher Document

5 - Using ball bearingsGive some examples of objects which use ball bearings.Why do we use ball bearings?There are ball bearings in bicycle direction, skateboard wheel axles, scooters,roller skates and bicycles, a drill’s spindle...Bearings can reduce friction between rotating parts.

PROJECT PART

DOCUMENT TITLE

A4

Name

ClassSchool

Date Drawing of assembly and exploded view

ASSEMBLY

NUMBER DESCRIPTION CHARACTERISTICS

1 01 External ring Man-made polyethylene 5002 01 Internal ring Man-made polyethylene 5003 09 Balls Injected ABS4 01 Cage Expanded PVCl5 01 Side of the cage

QUANTITY

08

Crystal PVC6 03 Elastic rivets (large head) Injected polyethylene

Exploded view View of the assembled bearing

Student Worksheet

Exercise1 - Fill in the gaps on the exploded view drawing.2 - Use different colours to illustrate the different components of the ball bearings on the

two drawings.

TECHNOLOGYAT SCHOOL