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