1GRASP

SAAST 2005Robotics

University of Pennsylvania

Dave Cappelleri

Piston Project:Machining Basics

2GRASP

Machining Overview - Handle

1. Rough Cut Stock to Length – Band Saw2. Face Right Surface – Lathe 3. Face Left Surface /Make Part Desired Length –

Lathe4. Turn Outer Surface – Lathe5. Drill Hole – Lathe6. Tap Hole – Lathe/Hand

Ø1/2

1.5

10-240.75

2

3

4

65

3GRASP

Machining Overview - Piston

1. Face the Right/Left Surface – Lathe

2. Turn the Outer Surface – Lathe

3. Cut Part in Half – Horizontal Saw

4. Machine to Length – Lathe5. Mill Flat Surface – Milling

Machine6. Drill Hole – Milling Machine7. Counter Bore Hole – Milling

Machine8. Tap Hole - Hand

1

Ø1.5

1.25

10-24 0.62

12

3

74

0.81

5

6

0.75

4GRASP

Machining Overview – Cam Wheel

1. Face Upper/Lower Surface – Lathe

2. Drill Hole in Center – Lathe

3. Counter Bore Hole in Center – Lathe

4. Drill Second Hole – Milling Machine

5. Counter Bore Second Hole – Milling Machine

Ø1/4

Ø 2

Ø1/4

Ø3/8

Ø3/8

0.75

0.190.25

AA

AA 1

1

2

3

5

4

0.32

5GRASP

Machining Overview – Body

1. Face the Right Surface – Milling Machine2. Face the Left Surface – Milling Machine3. Machine Rest of Body – CNC Machine

5.25

2

1

3

Machining Overview – Connection Arm

1. Draw Connection Arm in AutoCAD2. Laser cut with X-660 Laser Cutter

6GRASP

Machining Basics

http://www.seas.upenn.edu/~robo2005/machineTut.htm

Primary Machining for Piston Project:• Lathe• Milling Machine• CNC Machine

Primary Machining for Final Project:• Laser Cutter

7GRASP

Lathe Basics• Purpose: To rotate a part against a tool whose

position it controls• Useful for fabricating parts and/or features that have

a circular cross section

8GRASP

Lathe Basics

Main Power On/Off

Spindle Speed

Spindle RotationForward/Reverse

Spindle

Lathe Chuck

• Spindle: Part of lathe that rotates

• Workholding attachments held in spindle - three jaw chucks, collets, and centers

9GRASP

Lathe Basics

Quick Change Tool Holder

xy

(Axis of rotation)

Move the CROSS SLIDE along the X-axis

Move the SADDLE along the y-axis

Tailstock

• Tailstock: supports end of the workpiece, or hold tools for drilling, reaming, threading, or cutting tapers.

• Carriage: controls and supports the cutting tool • Saddle: mates with and slides along the ways. • Cross slide: controls transverse motion of the tool• A tool compound that allows angular tool movement.

10GRASP

Lathe Basics

TOOL

QUICK CHANGE TOOL HOLDER LOCK HANDLE

POWER FEED ON/OFF

SADDLE POWER FEED ON/OFFUP-ON, DOWN-OFF

CROSS SLIDE POWER FEED ON/OFF