In 2009, the tumbler CD was lost in a disk disaster.
Late in 2013, a backup was discovered and
it is again available at $US 10, postpaid.
to purchase a copy.
We admit -- and this should be understood by everybody --
that when we started to build our tumbler we were working from only
the very sketchiest of plans. Those plans were modified continuously
during the construction of the project to fit our ongoing ideas.
What finally emerged as the finished product shared only the frame
with the original concept.
So to be entirely truthful, we built our tumbler ad hoc, and
you could probably do the same, if you don't mind occasionally being forced
to eat some crow and admit that
"This particular idea isn't going to work." If you don't like
the idea of making mistakes -- and you will, we made plenty that
aren't on the web pages -- you should either pay someone else to
build it and yell at them for the mistakes, or buy the plans CD.
The feedback I got regarding the web pages indicated that
most readers could not read or work from a professionally
drafted set of standard blueprints.
No shame in that (today), as our schools no longer require young
men to take drafting, metals or machine shop. A loss in
my estimation, but there it is. And even if you do know
all those things, almost nobody except a welder can read
I've produced a CDROM with the following information.
It supplies detailed information and animations that allow you to
either duplicate our tumbler, or
modify what we built to suit your own particular needs.
The construction CDROM contains the following:
A brief but comprehensive overview of the project.
What the prototype cost to build, and example costs.
What tools and shop facilities are required to build the tumbler.
Bill of Materials
A complete listing of required metal stock and parts.
Suggestions on where to find the few unusual parts.
Cutting dimensions, finish standards, and stock-to-part
breakdown, including waste.
The assembly sequence and detailed information on each step
Construction of the Frame and Spindle Mounts
Construction of the Spindle and Bucket Collar
Construction of the Drive Train
Final Assembly and Electrical
Including a six minute computer animation of the tumbler assembling
itself from parts, and a walkround of the finished tumbler.
Original Web Pages
The pages you are viewing here.
Possible modifications to the basic tumbler.
Pulley Size Tables
For finding pulley sizes, given motor speed and a target bucket
Things encountered during operation of the prototype tumbler.
Here's a single page preview, extracted
from one of the assembly sections.