Mechanical Encoders
SErIES 71
binary Code
fEaTurES
•
1
/
4
" or
1
/
8
" Shaft Diameters
• 25,000 Cycles at 125 mA
• Optional Seal Versions
• Adjustable Stop Versions
DIMENSIONS
0.125"
Diameter
Shaft
.094 – .010
(2,39 – 0,25)
72
in inches (and millimeters)
.312 – .020
(7,92 – 0,51)
C
OF SHAFT
L
FLAT
.375 – .020
(9,53 – 0,51)
.250 – .020
(6,35 – 0,51)
.761 – .046
(19,33 – 1,17)
.031 (0,79)
REF.
.500 – .015
(12,7 – 0,38)
DIA.
GRAYHILL
81073
SHAFT IS
SHOWN
IN POSITION 1
.687 – .015
(17,45 – 0,38)
DIA.
C
L
OF
BUSHING
FLATS
.203 – .005
(5,16 – 0,13)
4
.562 – .015
(14,27 – 0,38)
.125 + .001/ .002
(3,18 + 0,03/ 0,05)
1/4 32-UNEF-2A
THREAD
Rear mounting
plate stamping
indicates CODED
output terminals,
not decimal posi-
tions.
8
C
2
1
SEE
DETAIL A
.750 – .020
(19,05 – 0,51)
OVER TERMINALS
0.250"
Diameter
Shaft
Optical and Mechanical
Encoders
.219 ± .004
(5,56 ± 0,10)
C
OF SHAFT
L
FLAT
72°
3/8 32-UNEF-2A
THREAD
Detail A
C
L
OF
BUSHING
KEYWAY
SHAFT IS
SHOWN
IN POSITION 1
.250 + .001/ –.002
(6,35 + 0,03/ –0,05)
.034 ± .003
(0,86 ± 0,08)
BUSHING KEYWAY
.066 ± .002 (1,68 ± 0,05) WIDE
BY .036 ± .003 (0,91 ± 0,08)
FROM A .375 (9,53) DIAMETER
.068 ± .005
(1,73 ± 0,13)
All dimensions and rear view not shown for
the .250" diameter shaft type are the same
as the .125" diameter shaft type.
Grayhill part number and date code marked on label. Customer part number marked on request.
CODE aND TruTh TablE
Output
Terminal
0
1
Decimal Position
2 3 4 5 6 7
8
9
OPTIONS
Shaft and Panel Seal
Shaft is sealed by o-ring inside the bushing;
panel is sealed by o-ring at the base of the
bushing. Seals do not alter dimensions as shown
in the drawing when switch is mounted. Panel
seal is silicone rubber. Shaft seal is an o-ring
per MIL-P-5516B. Shaft and panel seal is not
available on adjustable stop switch.
adjustable Stop Switches
Adjustable stop switch lets you limit the number of
positions. Remove and relocate pins in the front
plate. A sticker holds the pins in place. With the
exception of holes in the front plate, all dimensions,
ratings, and characteristics are the same as the
other Series 71 coded switches. For diagrams,
see Standard Switch.
1
l l l l l
2
l l l l
4
l l l l
8
l l
l
Indicates contact is made to the common.
SPECIfICaTIONS
Electrical rating
rated:
To make and break 125 mA at 30 Vdc
resistive at standard conditions
life Expectancy:
25,000 cycles at rated load;
50,000 cycles mechanical. For ratings at different
loads and conditions, contact Grayhill.
Contact resistance:
100 milliohms maximum
(50 milliohms initially)
Insulation resistance:
As measured between
mutually insulated parts
Initially:
50,000 megohms minimum
After Life: 10,000 megohms minimum
Voltage breakdown:
500 Vac between mutually
insulated parts
Carry Current:
These switches will carry 3
amperes with a maximum contact temperature
rise of 20°C.
OrDErING INfOrMaTION
additional Characteristics
rotational Torque:
8 to 16 oz-in.
Contacts:
Non-shorting wiping contacts
Shaft flat Orientation:
As shown in the
drawing, switch would provide a decimal 1
output.
Shaft Diameter
and Description
1/8" Continuous Rotation
1/8" Cont. Rot., Sealed
1/4" Continuous Rotation
1/4" Cont. Rot., Sealed
1/8" Adjustable Stops
1/4" Adjustable Stops
Part
Number
71aY23401
71aY23402
71bY23403
71bY23404
71aD36-3118
71bD36-3119
Materials and finishes
base:
Diallyl per MIL-M-14
rotor Mounting Plate:
Thermoplastic.
rotor Contact:
Phosphor Bronze, gold-plated
30 microinches minimum
Terminals:
Brass, gold plate (20 microinches
min) over silver plate (300 microinches min)
additional Materials:
Other switch materials
and finishes are the same as listed for the
standard switch.
available from your local Grayhill
Distributor.
For prices and discounts, contact a local
Sales Office, an authorized local Distributor or
Grayhill.
Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois
60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com
