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-   -   pic: FRC 51 - Wings of Fire Preship (http://www.chiefdelphi.com/forums/showthread.php?t=93854)

Chris Hibner 21-03-2011 14:53
pic: FRC 51 - Wings of Fire Preship
 

Alex Cormier 21-03-2011 14:55
Re: pic: FRC 51 - Wings of Fire Preship
 
Another great looking robot from this team. I have a few questions, why did you have the cord coming from the window motors so long? Also, I see that you didn't gear the speed up, rather you geared it down. Is there a reason for that as well?

Thanks!

Hopefully I'll have some time to check this bot out in STL.

Chris Hibner 21-03-2011 15:15
Re: pic: FRC 51 - Wings of Fire Preship
 
Quote:
Originally Posted by Alex Cormier (Post 1043212)
Another great looking robot from this team. I have a few questions, why did you have the cord coming from the window motors so long? Also, I see that you didn't gear the speed up, rather you geared it down. Is there a reason for that as well?

Thanks!

Hopefully I'll have some time to check this bot out in STL.
The cord from the window motors are belt-drives for the gripper. It's so long because we wanted the motors back at the pivot point of the arm so the torque required to move the arm is as small as possible.

For the gearing, it's actually direct drive off of the window motors. We have bigger pulleys driving the gripper now, which makes it a little faster.

Alex Cormier 21-03-2011 15:38
Re: pic: FRC 51 - Wings of Fire Preship
 
Quote:
Originally Posted by Chris Hibner (Post 1043229)
The cord from the window motors are belt-drives for the gripper. It's so long because we wanted the motors back at the pivot point of the arm so the torque required to move the arm is as small as possible.

For the gearing, it's actually direct drive off of the window motors. We have bigger pulleys driving the gripper now, which makes it a little faster.
Did you have any trouble of the cord slipping? We had a gripper setup with the window motors and cord as well. We had some slippage in a few different variations.

Chris Hibner 21-03-2011 16:03
Re: pic: FRC 51 - Wings of Fire Preship
 
Quote:
Originally Posted by Alex Cormier (Post 1043245)
Did you have any trouble of the cord slipping? We had a gripper setup with the window motors and cord as well. We had some slippage in a few different variations.
The cords slip a little, but not too often. We don't consider that a problem - we consider it a clutch that keeps things from breaking.

Rob 22-03-2011 18:16
Re: pic: FRC 51 - Wings of Fire Preship
 
Beautiful machine again this year Chris!


Quote:
Originally Posted by Chris Hibner (Post 1043267)
The cords slip a little, but not too often. We don't consider that a problem - we consider it a clutch that keeps things from breaking.
If slipage is an issue try routing your drive cords in an "X" shaped loop rather than an "O". This will get you a bit more wrap over the drive pulleys.

~Rob

Alex Cormier 22-03-2011 21:10
Re: pic: FRC 51 - Wings of Fire Preship
 
Quote:
Originally Posted by Rob (Post 1043901)
Beautiful machine again this year Chris!




If slipage is an issue try routing your drive cords in an "X" shaped loop rather than an "O". This will get you a bit more wrap over the drive pulleys.

~Rob
What I also did was use a "floating tensioner". (a zip tie)


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