R2'S
OUTER FOOT DRIVE ASSEMBLY DETAILS
This is where I'm
documenting the build of R2's Foot Drive System. I bought 4
ea. of the Big Lot's scooters and using the original 100 watt Scooter Motor,
Belt, Hubs, Tires, Axles, Motor Mounting Screws and Batteries. Not a
bad deal for $45 each!
DESIGN NOTES:
o 03/21/07 : I'm probably going to go with a single tire.
Outside tire either needs to be driven (like on a dual rear tire
truck) or taken out. It appears that the un-driven tire will
"high center" the inner driven wheel in certain situations, such as
going over a door plate unless you drive R2 directly perpendicular to
the object.
o 03/13/07 : I have
currently chosen to put the drive wheels in the rear of the foot shell.
Most
builders seem to lean toward putting the drive wheels towards the
front. I may switch them to the front just to see how he handles.
Right now, the drive system seems to be working great.
Besides, Daniel's drive wheels are in the rear, what else can you
say :)
o This is my "final" prototype drive system, except this design
was created using AutoCAD to make sure everything fit. Just hope
JAG's steel Outer Feet will fit up right (+/- a few thousands).
o The outer wheel is NOT driven. With dual tires, the center of the
ankle assembly falls directly in-between the tires making for even
weight distribution.
o Only purchased hardware was 0.063" 6061 aluminum plate, 1/2"
hexagon standoffs (tapped 10-32), and misc. screws, plus parts from the
Big Lot's electric scooter... that's it!
First: Hat's off to Andrew
Swartz for some idea's he gave me in the drive design by supplying some drawings of his Drive System....
CUTTING MOTOR HOLE : 01/11/07 : Using a circle cutter tool mounted on a drill press, I
cut the drive motor clearance hole in the inner drive assembly plate.
LAYOUT OF INNER DRIVE PLATES : 01/11/07 : Laying out the inner drive plates. Motor
mounting holes already drilled. Upper plate has all pilot holes drilled. Plates will then be cut
and trimmed to final outside dimensions....
LAYOUT OF OUTER DRIVE PLATES : 01/11/07 : Laying out the outer drive plates.
BENDING PLATES : 01/11/07 : Pix of bending upper drive plate.
DRIVE PLATE PARTS
: 01/12/07 : Here are the major plates for
the assembly. I bought a cheap sheet
metal bender from Harbor Freight. All plates are 0.063"
6061-T6. Had no problem bending
them, but the bender about gave up!
01/13/07 : Another picture of the plates for the drive assembly. Don't know why I did not
include the ball caster plate!
01/14/07 : Here is the Ball Caster and mounting plate.
01/15/07 : Starting to put together the Drive Assembly.
It is recommended to put tire sealer like "Slime" into the Big Lots tire/inner tubes to help stop
leaks. Here is Carolyn putting in the "Slime". So far have had no leaking problems. Best way
to fill these tires is to have a compressor with a regulator. Set the regulator to around 34 PSI
and fill away. Be careful though, tubes can be easily damaged!
Work table with parts... what a mess :) In this picture, the outside tire was mounted on the
wrong side. Heck, is was about 2:00 AM!
01/15/07 : Outside view.
I have the ball caster setup up 0.25 out of vertical.
Hopefully this will
allow enough clearance when I finally put in the 2-3-2 rods in the legs.
01/15/07 : Inside view.
01/15/07 : Rear view showing the two tires and main channel.
01/17/07 : Right side drive assembly completed! Now on to
testing on
this Friday 01/18/07.
01/15/07 : Right side with drive assembly mounted for test/fit up.
Looks good so far!!
---
ORIGINAL PROTOTYPE SETUP
My
prototype Big Lots "dualie" tire drive setup. Yes, it will
fit in the foot shell, barely.
Outer side view of the
drive assembly.
Outer side view of the
drive assembly.
First Created: Jan 15th, 2006
Last updated: March 21, 2007
Time: 1054 EST
