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C00002 00002 \\M1BDR25\M2SIGN57\M3NGR25\M4NGR20\F2\CVICARM
\F3\C154 EAST DANA STREET
\CMOUNTAIN VIEW, CA. 94041
Professor John Luh
School of Electrical Engineering
Laayette, Indiana 47907
Dear Professor Luh:
Enclosed are the layout and detail drawings of the Stanford Arm. In addition,
I have enclosed a parts list and some other information about the arm. This information
is not complete. In looking through the drawings you will note that some details are
not clearly shown, and some inconsistencies appear. I am working to improve the
drawings, but since this is out of the scope of my present work at Stanford Univ.,
the progress is a bit slow. In any event, with a little imagination, there is enough
information to complete the arm.
I mentioned my reluctance to assist you in making the arm entirely
yourself. This is because I always seem to underestimate the amount of my time required
to re-explain all the small but important details, each time a new group tackles
the arm. Thus, I am now suggesting to all those interested that they make all
the machined parts and do the major assembly and wiring, and let me deliver a kit
consisting of almost all the purchased parts, and some of the more delicate assemblies
already completed. This will save all parties time and effort.
The price of such a kit is expected to be about $5000 with potentiometer
feedback elements on all joints, and about $6000 with optical encoders on the
three shoulder joints (pots on the outer joints). I am presently saying that the
machining and assembly time will take you about 500 man-hours ( we can do it in
a lot less time, but I am including your spending some time figuring things out).
In addition, you will have to buy about $250-$300 worth of material (mostly
aluminum tubing and plate stock). The electronics will cost another $600 for parts
plus about 100 man-hours to assemble.
Also included is another brief description of the M.I.T. arm. As I mentioned
during our phone conversation, it is not practical to make one or even two
of these small arms, because the costs for the special gears, and other components
are prohibitive in small quantities.
The cost for the set of drawings is $15. Don't hesitate to call or write
should you have any furthur questions.\.