2010:Mechanical 2 01.12

01.12.2010

Start time: 6:45 PM

End time: 9:15 PM

Members present: Members present: Alex W.,Nathan K.,Mike Mo.,Jake K.,Mike Mac.,Chris H., Kristina K., Shauna R., Becca H., Sam _., Alex V., Tom C., Dave V., Mike W.

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Tasks Completed:

• We worked together to come up with a mechanism design.
• We jointly worked with drivetrain to review constraints and other important details
• We started working with a "golf club shooter" by manipulating designs on Auto Desk 
• We did not finish working on a final design and but did calculate the force needed to hit the ball effectivly 30 feet at 10 ft/second... It was calculated that this would required approximately 32 lbs of force applied to the ball for 6 inches of the contact with the ball.
• Tomorrow we should continue working with designs and with cad to refine a possible mechanism design.
• Brief experiment was performed to understand force capability of the surgical tubing supplied in the KOP.  8 strains approximately 12" long exert a force of approximately 43 ponds when streched to approximately 19".
• The images from today are in the wiki and have been inserted in the Images & Additional information section directly below.
  

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Tasks In Progress:

• task
  * task

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Tasks to Complete:

• task
  * task

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Images & Additional Updates:

(Use the upload file button on the toolbox to the left to upload the file, then insert an image using the button above. Sizing can be done using the length/width pixel size)

Variable Force Ball Kicker - Retracted

Variable Force Ball Kicker - Fully Extended after Firing

Over Running Clutch Actuator - Full Size

How It works

Variable Force Tubing Anchor - Min Position

• Link A is connected to the Kicker and Link B with a pin.
• Link B is free to rotate independent of the Drive Dog Pulley.
• Drive Dog pulley has a bronze bushing sleeve in it for the Link B shaft to rotate freely indepentent of the pulley.
• The Drive Dog pulley is solid aluminum with the Drive Dog key screwed to it.
•  The Drive Dog pulley is driven by a motor clockwise.
• As the Driver Dog pulley rotated clockwise the Drive Dog hits the side of Link B also causing it to rotate clock wise.
• When the Link A-to-B pin is below the horizontal centerline of
  

  Variable Force Tubing Anchor - Max Position
  the Drive Dog pulley it pulls the kicker arm back to the retracted position at the same time increasing the tension in the surgical tubing spring and stops at a position prior to Link A's center axis of the Drive Dog Pulley.
• To Fire - The driver presses the fire button and the Drive Dog motor starts to rotate clockwise again  with the drive dog pulley also rotating Link B.
• When the centerline of Link A passes by the center access of the Drive Dog Pulley the stored spring force is instantaneously released as Link B is free to "overrun" forward independent from the Drive Dog and the kicker are surges to kick the ball.