A

Presentation on

PARAMETRIC DESIGN OF SPUR

GEAR By

Prof. Sumit S. Dharmaraofor

PG-CONF-MECHANICAL-2013Organized by

ZEAL EDUCATION SOCIETY’S

25-26.March.2013

Contents

1. Abstract

2. Parametric Sketching

3. Benefits of Parametric Sketching

4. Spur Gear

5. Parametric Modelling of Spur Gear

6. Designing Parametrically

7. Conclusion

8. References

Abstract

The aim of this seminar is to get familiar with

Parametric Sketches, its importance & Benefits.

Spur Gear & its design & parametric modelling of

spur gear using software CATIA V5.

Parametric sketching

Parametric Sketching

1.Design Intent 2. Constraining 3.Equation

Benefits of Parametric Sketching

1. Quick Modification

2.Testing of Mechanisms

3.Creation of Design Rules

Spur Gear

Hertz Equation

Pc max= [µ x (F/L) x {(R1+R2)-1+(E1+E2)

-1}

A. Bending Failure

B. Surface

Destruction

(Pitting Failure)

Parametric Modelling of Spur Gear

Dimensions of Spur Gear

Designing Parametrically Parameter: a, m, Z (Key Parameters)

Procedure:

1.Start Generative Shape Design W/S

2.Enter Parameter & Formulae

3. Checking Parametric Generation

a.Define primary generation parameter

b.Define dependent parameter

c. Check primary & computed

parameter

d.Create geometric body & insert

element

e.Make geometric profile of first tooth

f. Extrapolate spline to centre

g.Rotate involute of curve for symmetry

h.Create rounded corner of next tooth

i.Asemble tooth elements of first tooth

j.Build whole gear profile & extrude

Conclusions

1. The parametric 3D computer modelling process works like a conventional numerical spreadsheet.

2. By storing the relationships between the various features of the design and treating these relationships like mathematical equations,

3. It allows any element of the model to be changed and automatically

4. Regenerates the model in much the same way that a spreadsheet automatically recalculates any numerical changes.

5. Such parametric model becomes a "living" model one that is constantly responsive to change offering a degree of design flexibility not previously available.

6. The same technology also allows curved surfaces to be "rationalized" into flat panels, demystifying the structure and building components of highly complex geometric forms so they can be built economically and efficiently.

References*Books:-

1. Jodeph Shigley & C.Mischke “Mechanical Engineering Design ( SI units) 6th edition, pp.825-945”

2. V.B.Bhandari “Design of Machine Element 2nd edition, pp.310-390”

3. R.S.khurmi & J.K. Gupta “A Textbook of Machine Design (SI unit) 14th edition, pp.1021-1214”

4. “IIT,kharagpur publication, module- Gear Drive”

5. R.B.Patil ʺ A Textbook of Machine Design (SI unit) 2nd edition,pp.380-460”

* Papers:-

1. Mr. Bharat Gupta1, Mr. Abhishek Choubey2, Mr. Gautam V. Varde3 1HOD of Mechanical dept., OIST, Bhopal, MP 2Assistan Professor in Mechanical dept., OIST, Bhopal, MP 3Student of M.Tech.in Mechanical dept., OIST, Bhopal, MP “Contact stress analysis of spur gear”

2. Atre Pranav C. and Thundil Karuppa Raj R.School of Mechanical and Building Sciences, VIT University, Vellore-632014, Tamilnadu, INDIA “Numerical Design and Parametric Design”

*Websites:-

• 1. www.sciencedirect.com

• 2. www.elsevier.com

• 3. www.gtrebaol.free.com

• 4. www.isca.in

• 5. www.ijert.org

THANK

YOU!

sumitdharmarao@gmail.com #contact no.09665060434