The Giant Claw Game! - The Gantry SystemMay 12, 2013 Edit
This week I have working on the gantry system. The gantry system is used to move the claw around inside the Cube.
I was originally planing on attaching the claw to 4 cables running to pulleys in each of the corners of the cube. The cables would be attached to four electric motors. Just like the sky cam that you can some time see at stadium.
I ended up not using the sky cam and going with a more traditional XY table. With a sky cam I would have had to have four matching electrical motors in each corner. To move the sky cam North/East/South/West you need to move all 4 motors in sequence making it more complex of a system.
I decided to use the CoreXY system for the claw’s XY table. Its a brilliant simple system that uses cables with only two motors instead the normal 4 motors. The system does need 8 pulleys two work. Rotating both motors in the same direction results in horizontal motion. Rotating both motors in opposite directions results in vertical motion.
I added a shelf on the top north and south sides of the cube. The shelf will carry the X axis (blue) up and down along the Y axis (red) giving the system its vertical motion. In the first picture you can see the wheels and the X axis bar.
I added the wheels to the X axis bar, installed the 8 pulleys and ran cabling thought the system. Using my fingers I pulled the cables back and forth to move the XY stage around. Everything worked!
Next I am going to add the motors to the gantry system and get everything moving around.