perm filename SPECS.M[1,VDS] blob
sn#103702 filedate 1974-05-24 generic text, type C, neo UTF8
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C00002 00002 SPECIFICATIONS FOR THE MODEL M.I.T. ARM
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SPECIFICATIONS FOR THE MODEL M.I.T. ARM
LIMITS OF MOTION-EACH JOINT (MINIMUM TRAVEL)
#1- 300 degrees rotation
#2- 300 degrees rotation
#3- 280 degrees rotation
#4- 600 degrees rotation
#5- 210 degrees rotation
#6- 600 degrees rotation
Hand- 4.5 cm. opening(closes to 0 opening)
SPEED,PEAK SPEED OF JOINT WILL BE AT LEAST THESE VALUES.
JOINT # UNLOADED .7 KG APPLIED LOAD AT HAND
1 4 rad/sec 2 rad/sec
2 2 rad/sec 1 rad/sec
3 3 rad/sec 1.5 rad/sec
4 6 rad/sec 3 rad/sec
5 6 rad/sec 3 rad/sec
6 8 rad/sec 4 rad/sec
Hand 10 cm/sec 5 cm/sec
MAXIMUM LIFT
Within the defined workspace which is a 20 centimeter
diameter hemisphere centered on a point on the same plane as the arm
base and 20 centimeters from the centerline of the base plate, the
arm will lift a rough steel block having a mass of 1.4 kg.
MAXIMUM REACH
Maximum reach of the arm is about .45 meters.Thus the arm can
access points within a .9 meter diameter hemisphere.
ACCURACY AND PRECISION
Within the defined workspace, the arm has an accuracy of 3
millimeters and a repeatability of 1.5 mm when using potentiometer
calibration tables and 12 bit resolution a/d. Resolution is equal to
the repeatability.
OTHER DETAILS
The arm runs on 120 vac. A built in power supply provides +
and- 30 vdc for the servo motors and brakes.The seven d.c. motors are
controlled through linear current amplifiers which require a +- 10
volt signal range from a DAC ( 7 channels of 8 bits min.). A single
cable interfaces the arm to the electronics package. Another cable
interfaces the electronics package to the computer interface, and a
third cable connects the electronics package to the hand held manual
controller/mode select unit. For the potentiometer and tachometer
computer interface a reference power supply and a minimum of a 16
channel, 12 bit a/d with a +- 10 vdc range is required.
The manual controller has 5 brake control switches (joints
1-5 have brakes), a joint/mode selector switch, and a joint speed
control pot to select and move individual joints.
TORQUE, FORCE AND DUTY CYCLE LIMITS
JOINT# MAX.CONTINUOUS TORQUE MAX.TORQUE(10%DUTY CYCLE-MAX. 10 SECS)
1 40 kg-cm 80 kg-cm
2 40 kg-cm 80 kg-cm
3 20 kg-cm 35 kg-cm
4 5 kg-cm 10 kg-cm (1 kg-cm approx. equals 1 in-lb)
5 5 kg-cm 10 kg-cm
6 3 kg-cm 8 kg-cm
Hand .3 kg. 4.5 kg
NOTE: All figures mentioned here are approximate. They are supposed
to be conservative numbers, but are not guaranteed specifications.