Under the guidance of Assistant Prof. M. P. Gururajan

Presented by Karan Oberoi (2008AMD3101)

Applied Mechanics Department IIT Delhi

Image Courtesy: www.ie.bilkent.edu.tr

Requirements:

1.Dimensional

Accuracy.

2.Surface Flatness.

3.Minimal Surface

Damage.

Draft from the Deutsches Museum in Munich,

Germany

Concept of a face lapping machine by Leonardo da VinciImage Courtesy: Handbook of Lapping and Polishing

Image Courtesy: www.cems.uvm.edu

Lapping parameters:

1. Lapping Wheels /

Plate

2. Lapping Medium

3. Lapping Abrasives

Hard / Soft

Slurry, which acts as the tool

5 m diameter alumina powder

sample

Lapping

Water

Ground Glass

Image courtesy: University of Illinois

Two body and three body abrasion

Image Courtesy: Handbook of Lapping and Polishing

Erosion wear

For ductile materialsFor brittle materials

Image Courtesy: Handbook of Lapping and Polishing

Deutsches Institut für Normung

Surface Lapping

Cylindrical Lapping

Thread Lapping

Profile Lapping

Lapping MachineImage Courtesy:

www. ctma.ncms.org

List of Abrasive Materials. Table Courtesy: South Bay Technology Inc

Lapping plate materials for brittle work-pieces:1.Diamond2.Cubic boron nitride3.Silicon carbide4.Aluminum oxide5.Corundum

Lapping plate materials for ductile work-pieces:1.Cast iron2.Copper3.Tin4.Lead

1. Scratches on work-piece. 2. Abrasive damage due to grain breakage.3. Forces developed affect properties of the

work-piece surface.

High accurate surface geometryGood qualityRepeatabilityRequired tolerance achievedNo warping of the componentsNo heat generation and thermal damage