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NASA-CR-205084 / ,/ / -
/
Semiannual Technical Progress Report
Aeromover Systems Corporation3045 Broad Street
Dexter, MI 48130
Contract # NAS1-20640
This report covers the third six month period of the subject contract from
January 26, 1997 to July 26, 1997. The contract statement of work covers four
specific applications of Aeromover's 'N'-output differential technology that
are being developed in cooperation with industry and NASA. A quantitative
description of work, project difficulties, proposed solutions, and a statement
of the work that will be performed during the next six months has been
included for each of the four projects.
Contract # NAS1-202640 development projects:
1. Robotic Gripper for industrial application
2. End-effector design for NASA application
3. Nut-runner for simultaneous torquing of multiple threaded fasteners
4. Multiple output drive for power auto seats
/ /'
1. Robotic Gripper for industrial application
A four output differentially powered end-effector has manufactured and
tested for use at our collaborating manufacture's facility (Variety Die and
Stamping). During the past six months, the prototype device has gone
through several small design adjustments and mechanical "tweaking" typical
for this type of first-iteration equipment. Strain gauges used to test the torque
at the output/fingers showed that drag coefficients at each differentiated
output were inconsistent when measured at angles of incidence not parallel
with respect to the ground plane. Our investigations revealed that this was
primarily due to deficiencies in precision in bushing and bearing supports.
Bearing supports were modified and these problems were overcome.
Because the chosen task for demonstrating our industrial end-effector does
not require a particularly precise differential mechanism it is possible that thefirst iteration would have been sufficient for the chosen tasks without
modification. However, the Principal Investigator, Mr. Srinivas Bidare' and
Aeromover personnel felt that design refinements were necessary to gain a
better hands-on understanding of ancillary issues effecting the performance
the differential driving mechanism. Investigation has revealed that several
specific areas where designers will need to focus attention if precision
performance is to be attained. These areas include the following:
https://ntrs.nasa.gov/search.jsp?R=19980213235 2020-06-17T07:27:46+00:00Z
Overcoming the inertial load of the gear train, while supported
at various angles. (Critical to driving motor/actuation).
2 Supporting bearings & bushings design/location (Necessary for
gaining nearly equivalent drag co-efficients at each
differentiated output).
. Design of consistent finger actuation mechanisms that are low
mass and not subject to excessive drag. (Slide mechanisms
designed for the current model are adequate, however, they
prove to bulky for more precision applications).
Eastern Michigan University (EMU) has received a refurbished PUMA robot,
which is being used to create a mock-up test sight that will simulate tasks in
the manufacturing environment. The EMU test site is being used so that any
unforeseen problems with the new robotic system can be resolved prior to
actual system installation. The test site will also offer the opportunity to
more easily collect cycling information. When the system has proven its
readiness in the laboratory it will be brought to the manufacturing facility and
installed. After installation the end-effector will be examined on a regular
basis to monitor for any potential problems. The manufacture will be given
the opportunity to evaluate performance of the new system for several
months, using the EMU robot, before deciding whether or not a system will
be permanently installed, at which time the EMU robot will be returned to
the University. By the end of the contract period the system will been
installed at Variety Die and they will be evaluating it's performance.
2. End-effector design for NASA application/design iterations
Discovering a specific NASA application for our differentially powered end-
effector was delayed due to difficulties in breaking through to program end-
users and designers and in receiving their specifications for automated tasks.
Lack of progress in this area resulted in Aeromover requesting that project
technical monitor, Walter Hankins, assist us in finding an appropriate contact
within NASA, that could supply Aeromover with appropriate design
specifications. Mr. Hankins supplied Aeromover with contacts at Johnson
labs in Houston, with whom a dialogue has begun. By the end of the contract
period Aeromover will supply a design to meet the design criteria of a specificNASA end-effector mission.
During the past six months, in lieu of having an actual specific application
from NASA, the Principal Investigator began designing a "lightest weight"
and "least massive" configuration of the "N-output" differential gear train.
This gear train is seen as an extremely promising for application in prosthetic
devices or in other applications where the miniaturization of
component/mechanisms is critical. NASA's Johnson lab is primarily
working with astronaut interface to specific "hand-like" functions being
carried out in space. Our flexible, compliant, durable, and light weight
mechanism could prove be very appropriate. The following drawing shows
our most recent design iteration for a miniature high-speed four outputdifferential.
L__ J J
The device shown is less than 1" in diameter and slightly more than 1" in total length.
The design shown here is capable of driving the four pounds of gripping force
necessary for our current industrial application presuming that gear
reductions are made at some point after the differentiated outputs. A generic
rule in designing differentially driven mechanisms is that the gear train can
be made smaller and lighter if the reduction is done at the end of the
differential rather than before it. Therefore, handling heavier payloads with a
small mechanism requires that greater gear reduction occur after
differentiation. In applications such as a prosthetic hand, there are several
opportunities to accomplish reduction after differentiation and this type of
mechanism would be ideal. Specific task work loads and product designconstraints will indicate whether or not the smaller scale differential will
prove practical. The following drawing illustrates how the miniature gear
train could be used to build an end-effector that could carry out our currentindustrial manufacturing task.
....................... It-
The drivetrain shown here offers a dramatic reduction in the size and weightvs. our current device. EMU Principal Investigator Prof. Max Kanagy has
been concurrently carrying out design calculations with Mr. Bidare' to
develop a slightly larger drivetrain, approx. 2" diameter and 2.5" height, that
would not require post-differentiation reduction to accomplish our 4 pound
workload requirement. Currently, Dr. Kanagy's work seems the most wellsuited to most industrial applications, while Mr. Bidare's seem best suited to
more specialized applications such as "high-end" prosthetic devices.
In the last six months Aeromover has been weighing the benefits of different
differential designs for potential applications at both Ford Motor Company
and for Delphi automotive. (Both companies advanced Robotics departments
have asked Aeromover to propose an end-effector developmental proposal).
In the next six months we will make proposals to both corporations based ontheir specific design criteria. Similarly we will also obtain an appropriate setof specific design requirements from NASA Johnson and apply the most
effective version of a differential mechanism to a their specific requirements.
3. Nut-runner for simultaneous torquing of multiple threaded fasteners
Designs for an eight output nut-runner have been completed for use atTecumseh products. A final design evaluation (outside engineering check) isbeing conducted by our design subcontractor, South Lyon Design.Tecumseh's existing nut-runner frame is being replicated, by Tecumseh, forAeromover to use in testing the new machine. We expect delivery of the
Tecumseh frame in from 6-8 weeks and completion of the differential drivemechanism within 10 weeks. Testing will then begin and take form 2-4weeks. We expect to deliver the machine to New Holstein, Wisconsin withinthe next 16 weeks. Drawings for the nut-runner are attached at the end of this
report.
4. Multiple output drive for power auto seats
Our originally proposed Industrial Collaborator for manufacturing a
prototype six-way seat drive mechanism, Johnson Controls Inc. (JCI), has not
responded to Aeromover proposals in a timely enough manner to meet the
demands of our STTR schedule. Therefore, a second seat-drive manufacture,
Delphi Automotive, has taken JCl's place as our industrial collaborator.
Delphi has offered to fund the development of the prototype seat drive,
contingent upon intellectual property agreements that would ensure that
they would not pay royalty on any findings made during prototype
developments which they help to fund, they also wish to hold exclusive
rights to any new technologies developed for the next three years.
Aeromover is planning to proceed with the Prototype development, but, has
taken several steps to better ensure that our product/technology can not be
"held-up" by our collaborator should they choose not to use the new
technology. We want to ensure that the technology has the best possible
chance of actually being implemented rather than being "sat-on"by a majormanufacturer.
Aeromover has therefore completed designs for a seat mechanism to the
industrial prototype level. Manufacturing p_ and sources have been
quoted and two votenlial manufachzrem amm:mcl_,ed. (Drawings for the ssat
drive mechanism and assembly plans are attached at the end of this report.)
Aeromover has now completed more work on this project than was
originally proposed under NAS1-20640. We have taken these extra steps to
ensure that the product we are developing actually has a reasonable chance
for wide spread use. We anticipate that within the next six months that
agreements will be finalized with Delphi and that a prototype device will be
tested. (Build of this prototype is not overly complex or time-intensive). If,
however, these developments would jeopardize our corporate position, we
will contact NASA contracting officers and attempt to get exceptions made to
the specific terms of the STFR.
SOUTH LYON DESIGN
RE'V,APR 12.,1997
AEROMOVER INC"--'3 OUTPUT SEAl" DRIVE
FOR FLEX SHAFT 6 OUTPUT
SOUTH LYON DESIGN
REV. APR 12,1997
AEROMOVER INC•.) OUTPUT SEAl" DRIVEFOR FLEX SHAFT 6 OUTPUT
i
AEROMOVER INC,ASSEMBLY
FOR 3 OUTPUT SEAT ASSEMBLY
NOTES:RE'VISION RECIE'VED APR 9 l gg71 CHANGE GEAR 1 TO DOUBLE HUNG2 ELIMINATE LEFT SIDE ALUMINIUM SUPPORT PLATE, INTEGRATE BUSHING
INTO PLASTIC MOLDED HOUSING
3 BUSHING MADE OF HARDENED STEEL W/ GREASE PACKED DURING ASSEMBLY4 SUN GEAR IS MADE OF POWERED METAL, INTEGRATED SHAFT AND HAS SQUARE HOLE FOR
CABLE DRIVE5 RING fEAR IS I_a,DE OF POWERED METAL
6 PLANET GEARS MADE OF POWERED METALOR COLD HEADED STEEL OR INJECTION MOLDEDPLASTIC, SMAF-F IS INTEGRATED INTO GEAR
7 COVER PLATE OF PLANETARY CAN BE MADE OF HIGH CARBON STEEL STAMPING WITH HOLESTHICKNESS MAY HAVE TO BE INCREASED TO REDUCE BEARING STRESS ON RING GEAR
8 ARM TO BE MADE OF POWERED METAL WITH LIGHTING HOLES OR PROFILE.9 OLD PLATE 3 - SNAP FIT INTO MOLDED PLASTIC HOUSING10 BRAKE LE'v'ER MADE OF PLASTIC WITH INTEGRATED SHAFT AND SPRING - NO FASTENER11 SOLENOID CAPTURED SNAP FIT AND HOUSED IN HOUSING
12 NO RIVETS, SHAFTS ETC TO CAPTURE BRAKE OR LEVER
NOTES:
AEROMOVER TO VERIFY TORQUE AND RPM OF ALL OUTPUT SHAFTSAEROMOVER TO VERIFY GEAR SIZE AND CAPABILIIh' FOR PRODUCT REQUIREMENTS
SOUTH LYON DESIGN
REV. APR 12,1997
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4 MOTOR 500 RPM
5 LATCH
6 GEAR
7 RIVET8 GEAR RING
9 ARM INPUT10 BUSHING
11 SHAFT OUTPUT12 SHAFT OUTPUT
13 SHAFT OUTPUT
14 SPRING
15 INPUT ARM
16 PLATE RETAINER
QTY
1
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62
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8
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MATERIAL SIZE / VOLUME WEIGHT
STEEL
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STEEL
STEEL
STEELSTEEL
STEELSTEEL
STEEL
STEEL
STEEL
STEEL
3/16 DIA X .65
SOUTH LYON DESIGN
REV. APR 12,1997
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SOUTH LYON DESIGN
RE"4, APR 12,1997
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AEROMOVER INC0 OUTPUT SEAT DRIVEFOR FLEX SHAFT 6 OUTPUT
AEROMOVER INCPREIMINARY ASSEMBLY OF6 OUTPUT SEAT UNIT
OPER DESCRIPTION
10 ASSEMBLY DIFFERENTIAL(12 SEC PER ASSEMBLY)
20 ASSEMBLY LOWER HALF
30 ASSEMBLY UPPER HALF
40 JOIN HALF, PRESSS &GREASE
50 MOUNT MOTOR
60 TEST & MARK PART
70 PACKAGE FOR SHIPMENT
TOTAL LABOR TIME (SEC/UNIT)
PRODUCTION RATE (PC/HR)
ANNNUAL UNITS/SHIFT
MANPOWER @ PROD. RATE
LABOR RATE
LABOR COST PER PIECE
OPERATOR MACHINETIME TIME
28 28
18 *
12 *
8 10
5 *
8 19
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84 28
128.57
257142.86
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$1.17
MANPOWER#I #2
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28
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AEROMOVERINCPREIMINARYASSEMBLYOF6OUTPUTSEATUNIT
EQUIPMENT
MACH DESCRIPTION
10INDEXPRESS& GREASE
40
6O
INDEX 180 DEGREEADVANCE PRESSPRESS COVERSTAKE 3 RIVETSRETRACT PRESSMANUAL UNLOADASSEMBLY
RIVET (3)BASEPLANETARY GEAR (3)COVER
TIME (SEC)
PRESS HALF & GREASELOAD HALVESPRESS TO POSITIONINJECT GREASE (8 PLACES)UNLOADTIME (SEC0
TEST PRODUCTLOAD ASSEMBLYCONNECT LEADSSTALL TESTSOL 1 TESTSOL 2 TESTSOL 3 TESTSOL 2&3 TESTREV TESTDISCONNECT LEADSUNLOAD
OPERATORTIME
2.00
3.002.003.002.00
12.00
4.00
2.006.00
2.002.00
2.002.008.00
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2.002.0O1.004.002.0O
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6.00
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19.00
AEROMOVERINCPREIMINARYASSEMBLYOF6OUTPUTSEATUNIT
CAPITALCOST
OPER DESCRIPTION
10 2 STA DIAL INDEX PRESS & STAKE MACHINECONPONENTS
BASEINDEX UNIT
PRESS SLIDE WITH FORCE MONITORSTAKE RAM (3) WITH DISTANCE MONITORFIXTURE (2)PNEUMATIC SYSTEMELECTRIC CONTROLLER
TRACK SECTION (2) (6 F'T')ESTIMATEBUILDER MARKUPCAPITAL COST
$95,00030.00%
$123,500
20 TRACK SECTION (6 FT)ESCAPEMENT & LATCH
30 FIXTURE
40 ASSEMBLY PRESS & GREASECONPONENTSCONPONENTS
BASELOWER RAMUPPER RAMLOWER RAM TOOLINGUPPER RAM TOOLINGESCAPEMENT (2)
TRACK SECTION(6 F'r)PNEUMATIC SYSTEMFORCE MONITORPOSITION MONITORELECTRICAL CONTROLLER
ESTIMATEBUILDER MARKUPCAPITAL COST
$105,00030.00%
$136,500
50
AEROMOVERINCPREIMINARY ASSEMBLY OF6 OUTPUT SEAT UNIT
TRACK (6FT)ESCAPEMENT & LATCH
6O TEST MACHINECONPONENTS
BASELOWER SLIDESPEED OUTPUT DEVICES (4)
TEST MOTOR CURRENT & VOLTBASE ELECTRICAL CONNECTORTORQUE BRAKE (1)MARKING SYSTEMPNEUMATIC SYSTEMELECTRICAL CONTROLLERTRACK SECTION (6 F"I')
ESTIMATEBUILDER MARKUPCAPITAL COST
QUALITY CONTROL ITEMSPC, STORAGE BACKUP, SPC, SHIP,DATA HIGHWAY, ETC
CAPITAL COSTCAPITAL COST/UNIT
$125,00030.00%
$162,500
$30,000
$452,500$1.76
FLOOR SPACE
COST PER PIEC
TOTAL COST PER PIECE
40 X 60.002400.00
$12$28,800
$0.11
$3.04
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