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Author Topic: The Failed Base  (Read 8669 times)

erco

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Re: The Failed Base
« Reply #15 on: April 18, 2017, 01:51:16 AM »
Nice project! Question to all: do the smaller VEX omniweels (#3 in the list) have slick plastic or grippy rubber rollers? I would hope/expect grippy rubber, but that's not what this first reviewer said at http://www.robotshop.com/en/vex-iq-63mm-omni-wheels-2pk.html

Yeah, pardon the source, I know better than to buy from there, but it's the only wheel review I've found.

Impala

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Re: The Failed Base
« Reply #16 on: April 18, 2017, 09:14:01 AM »
Those wheels are not very grippy by a rubber roller standard. Personally, I don't know of any that are truly grippy from vex.

kingart3

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Re: The Failed Base
« Reply #17 on: May 14, 2017, 08:33:04 PM »
I know I have been quiet a while, so here is a quick update on the base.

I cut a new base out of 1/2" plywood and increased the dimensions from 12" x 10" to 14"  x 13".  The 1/4" plywood was flexing a bit from the weight of the wheels and motors.  I originally planned to just put in some doublers to strengthen the heavy spots but going to 1/2" just was easier.

I transferred the motor brackets, motors and omni wheels to the new base, but managed to snap the terminals off one of my motors.  I may be able to salvage this (or not) by some careful drilling and then tapping some solder lugs in next to the missing terminals.

For some reason I cannot fathom now, two years ago I used 16 gauge wire on the motors.  My best guess is that I read each motor stalled at 3 amps and multiplied that by 4x to get 12 amps and panicked.  I now know (because I read it some place) that I shouldn't run the motors at more that 25% of its max rating.  If I am stalling out, burning up a wire might be good.  I am going to put in a fuse this time anyway, so I shouldn't be running into those kinds of currents.

Anyway, I am going to take the 16 gauge off before I break anymore motor terminals.

In the New Plan, I am going to put the batteries in a battery box on the bottom of the base.  This will keep keep the center of gravity down low and makes putting the batteries in and out easier.  I deliberately got big wheels in case the design went that direction but if I put the battery compartment on the bottom the motors need to go below as well (for the ground clearance).  The result is a lot of empty space in the base.

The base should have the micro controller, the motor controller inside, then its just switches, fuses, some terminal strips and maybe a fan.  I bought a computer-type fan and grill to help keep the robot cool inside, that was before I stuck everything on the bottom.  Maybe I will save the fan and mount it on the back of the robot's body.

Today, I had a party with my table saw and cut out the parts to build the battery compartment, also the top and sides of the base.

When I have something moving, I will  post some pictures and a video.
Dread Robotic Overlord

Impala

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Re: The Failed Base
« Reply #18 on: May 14, 2017, 09:10:38 PM »
Schweeet!  Keep the updates coming!

 

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