It is possible that the motor is programmed to rotate more than it is physically able.  When it hits the floor it enters a stall state and never completes the program block so it never progresses.  Try holding the robot off the table.  If it works while elevated, all you need to do is reduce the number of rotations. 


Sent from my smartphone


-------- Original message --------
From: B Bergenstock
Date:11/09/2014 3:18 PM (GMT-05:00)
To: [log in to unmask]
Subject: Re: [VADCFLL-L] Question regarding Arm

Sounds like a leverage issue. It can swing it one way but can't get enough torque to lift it back up. Using gears can help increase your torque. 
http://curriculum.vexrobotics.com/curriculum/mechanical-power-transmission/gear-ratios
here's a Vex page on the topic. 
Brandy

On Sun, Nov 9, 2014 at 3:04 PM, Heather Young <[log in to unmask]> wrote:
My team is having a hard time making the robot move once the arm is down.  Can anyone help us?
 
Thanks,
Heather Young
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