Difference between revisions of "RoboCupMechanical2008"

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This page houses the current RoboCup Mechanical efforts. The 2007 efforts can be found [[RoboCupMechanical2007 | here]]. All development work will be done in Autodesk Inventor 2008. How to use Inventor and get it can be found on the [[How to Guide Inventor | Inventor How to Guide]]. Inventor is also available on our CAD Machines in Tin.
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This page houses the 2008 [[RoboCup]] Mechanical efforts. The 2007 efforts can be found [[RoboCupMechanical2007 | here]]. All development work will be done in Autodesk Inventor 2008. How to use Inventor and get it can be found on the [[How to Guide Inventor | Inventor How to Guide]]. Inventor is also available on our CAD Machines in Tin.
  
Mechanical team meets Monday at 7pm and after the general meeting on Thursdays at 6:30
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Mechanical team meets Tuesday 6-9pm with the general meeting at 7pm and 2-6pm on Sundays. More hours will be announced as deadlines approach.
  
 
[[Image:RC2008DevRender.jpg|thumb|right|A developement rendering of a 2008 RoboCup robot]]
 
[[Image:RC2008DevRender.jpg|thumb|right|A developement rendering of a 2008 RoboCup robot]]
  
 
==Systems==
 
==Systems==
* Drivetrain
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: [[RC08-Components|System Components and Bill of Materials]]
** [[RC08Omni|Omni Wheels]]
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===Drivetrain===
** [[RoboCup Drive Motors/Gears|Motors/Gearing]]
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: [[RC08Omni|Omni Wheels]]
** [[RC08Drive Module|Drive Module]]
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: [[RoboCup Drive Motors/Gears|Motors/Gearing]]
* Integration
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: [[RC08Drive Module|Drive Module]]
** Shell
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===Integration===
** [[RC08Chassis|Chassis]]
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: [[RC08Shell|Shell]]
* Ball Control
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: [[RC08Chassis|Chassis]]
** [[RC08-Dribbler|Dribbler]]
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===Ball Control===
** [[RC08-Kicker|Kicker]]
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: [[RC08-Dribbler|Dribbler]]
** Chipper
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: [[RC08-Kicker|Kicker]]
*[[RC08METestRig|Test Rig]]
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: [[RC08-Chipper|Chipper]]
 +
: [[RC08BallSens|Ball Sensor]]
 +
===Testing===
 +
: [[RC08METestRig|Test Rig]]
 +
: Slope
 +
: Impact Test
  
 
==Schedule==
 
==Schedule==
* deadline for completion of Everything Box - 11/30/07
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* delivery of completed team of Robots 5/21/08
* completion of ONE DRIVING, COMPLETE robot - 1/7/08
 
  
 
==Specifications==
 
==Specifications==
Line 32: Line 36:
  
 
==Meetings==
 
==Meetings==
*9/6/07 - Update for new members, organized testing plan and ideas
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*9/13/07 - Organized most of the required tests into one device that will be designed starting on monday when we get CAD computer's back in the TIN.
 
*9/20/07 - The Test Rig aka "The Everything Box" is being designed and components spec-ed out. The hunt continutes for the dribbler motor.
 
*9/24/07 - Everything Box still being designed, would like to start ordering parts on Monday 10/3/07. Idea generation started on the dribbler system such as suspension and damping systems
 
*9/27/07 - Test Rig nearing completion. Concepts of ball control system discussed as well as the use of solenoids or some other actuator for the kicker
 
*10/1/07 - A cheap treadmill is being looked at for the testing rig. Conceptual planning is being done on the ball control system. Throughout the week, different ideas for the profile of the dribbler will be made on the lathe and then tested.
 
** the shaft output of the dribbler bar must be 3mm in diameter to fit in the gear of the current dribbler
 
*10/4/04 - Dribbler prototypes designed and parts are being ordered to make it. The dribbler motor was chosen and is being ordered as well. Work still continues on the kicker and chipper actuation. Lets work some over fall break! yah...!
 
*10/11/07 - Dribbler prototype drawings made. Ball control system still in discussion.
 
*10/15/07 - Everything Box design done, parts ordered tomorrow. Drive modules nearing completion.
 
*10/18/07 - Everything Box is under construction
 
*10/22/07 - Everything Box is under construction, other parts are being designed
 
*10/25/07 - Everything Box design complete and parts are being fabricated
 
*10/29/07 - Everything Box still being fabricated
 
*11/1/07 - No Robocup meeting due to the Virginia Tech football game
 
*11/4/07 - No Robocup meeting. Everyone busy.
 
*11/7/07 - Mechanical and electrical components for Everything Box being fabricated.
 
*11/26/07 - Everything Box is nearly complete, as are the electronics for it. Electronic controls are also nearly done for to control the new drive motors - giving the CS team a platform to use for testing. The machining of a few parts will be outsourced to different suppliers.
 
  
 
==Documentation==
 
==Documentation==
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==Testing==
 
==Testing==
 
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[[RoboCup Testing | RoboCup Testing]]
Dribbler test
 
 
 
Functions:
 
 
 
Trap ball
 
* Ball speed- speed the ball can hit the without moving back. Use a spring and a speed trap to measure the speed.
 
* Ball angle- rotate the robot
 
* Rebound- distance the ball bounces back
 
 
 
Hold ball
 
* Center time- measure time in seconds
 
* Climb ball- measure change in normal force on the measuring platform
 
* Pull force- angle of loss of contact. Measure what incline the measuring platform is required for the dribbler to lose contact
 
* Reverse speed- have the robot on a treadmill and measure when the ball comes lose
 
* Lateral speed- have the robot on the treadmill but have the dribbler facing tangential to the motion
 
* Rotational speed- rotate the speed of the carpet and see when the dribbler loses control
 
 
 
Material Test
 
* Measure either the lifetime of the dribbler under continuous operation and visually inspect the dribbler.
 
 
 
Kicker Test
 
* Control speed- speed trap measuring velocity versus voltage
 
* Accuracy- impact test to measure where the ball impacts a wall
 
* Lifetime- how long does the kicker last both with a ball being hit and when there is no ball. Also measure changes in speed and accuracy over time.
 
* Frequency- how long between successive firings
 
 
 
Chipper Test
 
* Range- to where the ball lands
 
* Angle- accuracy to how close the ball lands
 
* Lifetime analysis same as kicker
 
 
 
Shell impact Test
 
* Maximum speed ball at different areas of the shell until it breaks
 
 
 
Omni wheels Test
 
* Traction- run the robot up an incline
 
  
 
==Quick Notes==
 
==Quick Notes==
Line 103: Line 54:
 
** last two points from Cornell 2003 Mechanical Documentation
 
** last two points from Cornell 2003 Mechanical Documentation
  
==Parts==
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==Prototype Notes==
*[[RC08-Components|System Components and Bill of Materials]]
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*make drive module shaft out of stronger material to prevent bending
*[[RC08-Parts|Parts to Order]]
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*ground clearance needs to be increased to prevent the robot from rubbing on the carpet
 +
*4mm holes on the dribbler assembly need to changed to .177" - clearance hole for a 8-32 screw - ease of assembly, prevent burring of the dribbler shafts
 +
*binding of the drive modules can be reduced by adjusting the position of the motor, using the tolerance of its mounting screws
 +
*design plastic guide block so hole for chipper hinge is centered
 +
*dribbler motor plate needs to be wider and flush to the motor
 +
*M2x4mm screws need to be ordered for the dribbler motor
 +
*consider increasing diameter of dribbler roller to add strength to the piece
  
 
==Useful Links==
 
==Useful Links==
 
* [http://www.cis.cornell.edu/boom/2005/ProjectArchive/robocup/ Cornell Documents] (Look at 2003)
 
* [http://www.cis.cornell.edu/boom/2005/ProjectArchive/robocup/ Cornell Documents] (Look at 2003)
 
[[Category: RoboCup]] [[Category: 2008]]
 
  
 
* [ftp://ftp.itam.mx/pub/alfredo/PAPERS/SotoWeitzenfeld80LARS2006.pdf Eagle Knights Dribbler Testing]
 
* [ftp://ftp.itam.mx/pub/alfredo/PAPERS/SotoWeitzenfeld80LARS2006.pdf Eagle Knights Dribbler Testing]
 
[[Category: RoboCup]] [[Category: 2008]]
 
  
 
*[http://www.sdp-si.com/D220/D220cat.htm#T35 Mechanical Engineering Tips]
 
*[http://www.sdp-si.com/D220/D220cat.htm#T35 Mechanical Engineering Tips]
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*[http://pergatory.mit.edu/2.007/Resources/index.html#manufacturing MIT Design Handbook Index] (VERY GOOD)
 
*[http://pergatory.mit.edu/2.007/Resources/index.html#manufacturing MIT Design Handbook Index] (VERY GOOD)
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*[http://thomasnet.com Global supplier and CAD drawing database]
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[[Category: RC Mechanical]]
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[[Category: 2007-2008]]

Latest revision as of 21:40, 24 May 2020

This page houses the 2008 RoboCup Mechanical efforts. The 2007 efforts can be found here. All development work will be done in Autodesk Inventor 2008. How to use Inventor and get it can be found on the Inventor How to Guide. Inventor is also available on our CAD Machines in Tin.

Mechanical team meets Tuesday 6-9pm with the general meeting at 7pm and 2-6pm on Sundays. More hours will be announced as deadlines approach.

A developement rendering of a 2008 RoboCup robot

Systems

System Components and Bill of Materials

Drivetrain

Omni Wheels
Motors/Gearing
Drive Module

Integration

Shell
Chassis

Ball Control

Dribbler
Kicker
Chipper
Ball Sensor

Testing

Test Rig
Slope
Impact Test

Schedule

  • delivery of completed team of Robots 5/21/08

Specifications

  • maximum robot weight - 1.8 kg
  • ball speed after being kicked - 10 m/s
  • dribbler bar speed - 8000 rpm
  • compress time (time for dribbler to absorb ball's energy and compress) - .2 seconds
  • no more than 20% of the ball's area (seen from top view) may be occupied by the robot - a critical Robocup SSL Rule
    • see Ball sketch

Meetings

Documentation

Testing

RoboCup Testing

Quick Notes

  • field area 5 meters x 3.5 meters
  • max ball speed - 10 m/s
  • ball diameter - 43 mm
  • ball mass - 46 grams
  • 1 rpm = .105 rad/s
  • ball material - DuPont Surlyn Ionomer Dupont's Surlyn Page
  • coefficient of static friction of golf ball on felt carpet - .66
    • last two points from Cornell 2003 Mechanical Documentation

Prototype Notes

  • make drive module shaft out of stronger material to prevent bending
  • ground clearance needs to be increased to prevent the robot from rubbing on the carpet
  • 4mm holes on the dribbler assembly need to changed to .177" - clearance hole for a 8-32 screw - ease of assembly, prevent burring of the dribbler shafts
  • binding of the drive modules can be reduced by adjusting the position of the motor, using the tolerance of its mounting screws
  • design plastic guide block so hole for chipper hinge is centered
  • dribbler motor plate needs to be wider and flush to the motor
  • M2x4mm screws need to be ordered for the dribbler motor
  • consider increasing diameter of dribbler roller to add strength to the piece

Useful Links