SAK CS:R Center Foot
There are several parts that you will need to complete the Center Foot Assembly.
Colson Caster 1 Series Threaded Swivel Stem Caster
with a Performa Rubber (Flat/Grey) 3 in wheel
Part # 1.03054.441 MTG55 Note: 3/8-16 1.25 in stem
I bought mine on eBay from : http://stores.ebay.com/handtruckscastersdockplates/
search for "Colson Swivel Stem Caster with 3" Performa TPE Gray Non-Marking Wheel"
they take best offers for 10-15% less, particularly if also buying wheels for the outer feet
at the same time (also combines shipping)
Vex Omni Wheel Version
based on work published by Kevin Holmes
uses 4 inch Omni Wheels
4 x 217-2584 4" Omni Wheel - http://www.vexrobotics.com/omni-wheels.html
4 x bearing (#2732): http://www.vexrobotics.com/bearings.html
1 Pack of Spacer (#3260): http://www.vexrobotics.com/acetalspacers-vexpro.html
Omnitrack Omnicaster Version
need 2 - OC55 casters
Dimensions: 3/8" dia. x 1/16" thick - Grade N52
K&J Magenetics part number D61-N52
you'll need 8 - buy some extras! - also used in the Outer Foot Shell
two 3/8 x 4.0 inch bolts for axles and nylock nuts (vibration proof)
[thanks to Matt Gates for noticing the error - originally said 3/8 x 3.5in!]
four 1/4-20 x 1 inch bolts and nylock nuts -
to fasten either caster mount or wheel mounts to shell
I have an aversion to installing
bolts in holes
threaded into styrene parts when the bolts are under stress.
to attach the Center Foot to the
Center Ankle I'm using a 3/8 x 1 in. aluminum spacer in the
and a pair of 3/8 shoulder bolts in the foot shell.
The Shoulder Bolts
Shoulder bolts, Allen, Alloy steel black oil finish, 3/8" shoulder (5/16"-18 thread) x 1/4"
QTY 2 - Bolt Depot part# 14069
The Aluminum Spacer
Used as an insert the spacer goes into the Center Ankle to hold the shoulder bolts.
QTY 1 - Aluminum Spacer #AS38-14-64 For 1/4" or 6mm bolts
OD = .375 (3/8") 9.53mm
ID = .257 6.53mm
L = 1.000 (1") 25.4mm
enough the ID on this spacer (.257 in.) is exactly the size you would
have to drill in order to tap it for a 5/16"-18 thread.
I can provide tapped spacers, with or without the shoulder
bolts, at nominal cost (and a lot cheaper than buying the tap!)
used both Weldon #3 and Weldon #16 cements for the assembly. Each at
different points in the assembly process. You should use both, or
A Note on suppliers cited
have no relationship with any of them, except as a satisfied customer.
Most were chosen because of their low prices, no minimum quantity order
requirements, and cheap shipping.