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Grayhill Mechanical Rotary Encoders 71 Series User Manual

Mechanical encoders, Series 71, Dimensions

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Optical and Mechanical

Encoders

Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com

Mechanical Encoders

0.125"
Diameter
Shaft

All dimensions and rear view not shown for
the .250" diameter shaft type are the same
as the .125" diameter shaft type.

DIMENSIONS

in inches (and millimeters)

Rear mounting
plate stamping
indicates CODED
output terminals,
not decimal posi-
tions.

Grayhill part number and date code marked on label. Customer part number marked on request.

CODE aND TruTh TablE

Output

Decimal Position

Terminal 0 1 2 3 4 5 6 7 8 9

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.

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.

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.

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.

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.

available from your local Grayhill
Distributor.
For prices and discounts, contact a local
Sales Office, an authorized local Distributor or
Grayhill.

OrDErING INfOrMaTION

Shaft Diameter

Part

and Description

Number

1/8" Continuous Rotation

71aY23401

1/8" Cont. Rot., Sealed

71aY23402

1/4" Continuous Rotation

71bY23403

1/4" Cont. Rot., Sealed

71bY23404

1/8" Adjustable Stops

71aD36-3118

1/4" Adjustable Stops

71bD36-3119

SErIES 71

binary Code

fEaTurES

1

/

4

" or

1

/

8

" Shaft Diameters

• 25,000 Cycles at 125 mA
• Optional Seal Versions
• Adjustable Stop Versions

OF
BUSHING
FLATS

C

L

.094 – .010
(2,39 – 0,25)

OF SHAFT
FLAT

C

L

.203 – .005
(5,16 – 0,13)

.687 – .015

(17,45 – 0,38)

DIA.

.562 – .015

(14,27 – 0,38)

1/4 32-UNEF-2A
THREAD

.125 + .001/ .002
(3,18 + 0,03/ 0,05)

.031 (0,79)
REF.

.761 – .046

(19,33 – 1,17)

.312 – .020

(7,92 – 0,51)

.375 – .020

(9,53 – 0,51)

.250 – .020

(6,35 – 0,51)

.500 – .015
(12,7 – 0,38)
DIA.

SEE
DETAIL A

.750 – .020

(19,05 – 0,51)

OVER TERMINALS

GRAYHILL

81073

8

1

4

C

2

72

SHAFT IS
SHOWN
IN POSITION 1

OF
BUSHING
KEYWAY

C

L

.219 ± .004
(5,56 ± 0,10)

OF SHAFT
FLAT

C

L

72°

.250 + .001/ –.002
(6,35 + 0,03/ –0,05)

3/8 32-UNEF-2A
THREAD

BUSHING KEYWAY
.066 ± .002 (1,68 ± 0,05) WIDE
BY .036 ± .003 (0,91 ± 0,08)
FROM A .375 (9,53) DIAMETER

Detail A

.068 ± .005
(1,73 ± 0,13)

.034 ± .003
(0,86 ± 0,08)

SHAFT IS
SHOWN
IN POSITION 1

0.250"
Diameter
Shaft