A Zero-Max Drive is a mechanical adjustable speed drive.
Five sizes provide constant torque of 12 to 200 inch pounds
throughout the speed range. The speed range is innitely
variable from 0 to 1/4 of the input speed under full rated
load. This is generally stated as 0-400 RPM assuming an input
of 1800 RPM.
For lower speed/higher torque applications, some Zero-Max
Drives are available with right angle gearheads. Some
Zero-Max Drives may be purchased with standard electric
motors or they may be connected to any rotating power
source up to 2000 RPM. Speed adjustments are easily
made by moving a lever control through an arc or turning
the handwheel of a screw type control. In either case,
precise speed control settings are possible.
Over 1 million Zero-Max Drives have been put to work
in a wide variety of applications. They are available from
distributors in all major markets throughout the world.
Features ........................................... Benets
Compact ................................................ Easy to handle/compact
Simple to install ...................................... No special wiring/training
Simple operation .................................... Repeatable & easy to operate with lever or screw control
Use anywhere on machine ....................... Accepts input to 2,000 RPM. Ideal as a secondary drive
Constant torque ...................................... Delivers constant torque throughout the speed range
4:1 speed reduction ................................ Often usable without additional speed reduction
Change speed anytime ............................ Speed set-ups are made quickly and easily
Change speed frequently ......................... Permits slow or fast, small or large speed changes
Change speed continuously ..................... Ideal for dancer applications/constant speed changes
Leave at one setting ................................ No daily speed cycling
Accurate speed holding ........................... No “wear-in” period/constant speed operation
Accepts any input ................................... World’s most versatile, economical secondary drive
Goes to zero output ................................ Ideal for use as a clutch
Innitely adjustable ................................. 0-400 RPM speed range with 1800 RPM input
1
Match the Zero-Max® Drive to These Components
To achieve the exact performance characteristics
you desire, Zero-Max provides the following
matching components:
For Model E and JK Drives, a right angle gearhead and
selection of motors are available.
For models Y, QX and ZX Drives, C-Flange adapters are
available for connecting customer supplied motors to the
drive you have selected.
Unidirectional Drives
E Models
1, 2, 41 or 42
Torque Rating 12in. lbs.
Speed Range 0-400.
Normal Input 1/4-1/3 H.P.
JK Models
1, 2, 41 or 42
Torque Rating 25in. lbs.
Speed Range 0-400.
Normal Input 1/4-1/3 H.P.
Y Models
1, 2, 41, or 42
Torque Rating 60in. lbs.
Speed Range 0-400.
Normal Input 1/2 H.P.
Lever control is standard on all drives. Optional controls
include: screw control, extended screw control, extended
lever control, extended control shaft, microdial control,
plus atted and drilled control levers.
Direction of output rotation must be speci ed and is
independent of input direction. Model numbers ending
in “1” are CCW output, “2” are CW output and “3”
are reversible.
QX Models
1, 2, 41 or 42
Torque Rating 100in. lbs.
Speed Range 0-400.
Normal Input 3/4 H.P.
ZX Models
1, 2, 41 or 42
Torque Rating 200in. lbs.
Speed Range 0-400.
Normal Input 1-1/2H.P.
Reversible DrivesGearheadMotors
E Model 3
Torque Rating 12in. lbs.
Speed Range 400-0-400.
Normal Input 1/4-1/3 H.P.
JK Model 3
Torque Rating 25in.lbs.
Speed Range 400-0-400.
Normal Input 1/4-1/3 H.P.
Y Model 3
Torque Rating 60in.lbs.
Speed Range 0-400.
Normal Input 1/2 H.P.
Right angle gearheads
available for E and JK Models.
Right Angle - 4 Models
W1 4:1 W2 10:1
W3 20:1 W4 40:1
Many popular voltage, Hz,
phase and enclosures are
available for use with drive.
E Models 1, 2, 3/ JK
Models 1, 2 and 3
C-Face Adapters
MODEL CFY*
Includes coupling for
56 frame motor
.
MODEL CFQ
Includes coupling for
56 frame motor.
MODEL CFZ
Includes coupling for
56 frame motor.
All C-Face Adapters will accept 56, 143T and 145T frame motors.
*CFY adapter not compatible with Y3 reversible drive
2
STANDARD
6 O'CLOCK
Controls for Zero-Max® Drives
Standard Lever Type Control
The lever control can be removed from its
customary 12 o’clock position and moved
to a 6 or 9 o’clock position on E and JK
Models and to any position on Y, QX and
ZX Models that will not interfere with
the casebody or shaft. Flatted and drilled,
as well as extended levers, are available
for easy attachment to any kind of remote
control, or for use on tension control
applications.
C
Standard Lever
B
9 O'CLOCK
A
D
Lever Control DimensionsLever Torque
Drive ModelA BCD(Running, no load)(Not running, full load)
E 5.2552°2.501.007 in. lbs.20 in. lbs.
JK5.2552°2.501.007 in. lbs.35 in. lbs.
Y6.7552°3.251.6815 in. lbs.66 in. lbs.
QX8.2554°3.551.9036 in. lbs.90 in. lbs.
ZX10.0063°3.062.4050 in. lbs.160 in. lbs.
Optional Screw Type Control
All Zero-Max Drives are available
A
B
C
with screw control. Screw controls
give very precise control of speed
and many kinds of remote control
attachments are easily made. They
are positive and easy to calibrate.
Kits are available for adding
screw control to drives in the eld.
The hand-wheel can be mounted
on either end of the screw.
Drive ModelAB C DEF
E__SC1.502.126.060.373.750.18382 in. lbs.
JK__SC1.502.126.060.373.750.18382 in. lbs.
Y__SC1.502.257.420.444.580.18503 in. lbs.
QX__SC2.122.878.810.375.870.25684 in. lbs.
ZX__SC2.12 6.1212.310.507.440.31914 in. lbs.
SCREW CONTROL DIMENSIONS
3
D
F
E
Screw Control
Number
of Screw
Turns
Screw
Torque
(inch-Lbs.)
Controls for Zero-Max® Drives
Optional Microdial Type Control
Drive models E, JK, and Y are available with Microdial control.
The Microdial is an enhanced Screw control that will provide the
user with a numerical value that will correspond to a given speed
setting. For added exibility, these units can be ordered with the
Microdial counter on either end of the control. The Microdial
is ideal for applications that require the speed setting to be
adjusted often and need a high level of repeatability. Kits are
available for adding the Microdial control to drives in the eld.
Microdial Control*
*LH (left hand) conguration shown
Numerical
G
C
Counter
H
E
I
Drive ModelACEGHIJ
E__MD-__1.506.123.751.661.970.252.140-76
JK__MD-__1.506.123.751.661.970.252.140-76
Y__MD-__1.507.424.581.661.970.342.140-100
Type MD-LH
MICRODIAL DIMENSIONS
Drive Operating Characteristics
Input Speed should not exceed 2,000
RPM. There is no minimum, but as input
speeds approach zero, slight variations
in the angular velocity of the output
may become noticeable. It is much
better to use higher input speeds and
take as much reduction as possible
from the output shaft to maximize
precise speed control. Direction of the
input does not affect direction of output
but does affect the speed range and
performance of the Zero-Max Drive. The
recommended input rotation direction
in relation to output is given below.
If output speeds are substantially in
excess of rated speeds or if the drive is
noisy or vibrating at top speed, the nonpreferred direction input is probably
being used. Try reversing the motor so
the input is in the other direction.
Output Speed is innitely adjustable
from 0 to 1/4th of the input speed.
Speeds can be maintained or repeated
with accuracy of 1% or less of
maximum speed in the upper 90% of
the range providing output load and
input speed are constant.
Zero-Max Drives
Models vary in their ability to give
absolute zero under light loads. All
models go to zero output speed under
full rated load.Output Torque ratings
listed for various models are constant
throughout the speed range and
assume an input speed of 1800 RPM.
The drives are designed for continuous
duty running at one speed, a variety
of speeds or continuous speed cycling.
Additional output torque may be
gained by lowering input speed. In
general, the torque rating of all models
may be increased 25% if the input
speed is 900 RPM or lower.
Temperature
A rise of 40° C above ambient may be
expected in the drive assuming input
speed of 1800 RPM. This temperature
will generate surface heat too hot for
continued skin contact. This does not
indicate a malfunction nor does it affect
the performance of the drive. The drives
are built to withstand high operating
temperatures but they should never
exceed 90° C.
A
J
A
J
C
G
H
E
Type MD-RH
Numerical
Counter
Range
Thrust
Model
E & JK201225
*Note: At mid-point of Input and Output Shafts
Overhung Load Pounds
OutputInput
Y403075
QX5040100
ZX400100400
W400–500
*
Pounds
Load
Control Linearity
Movement of the Zero-Max speed
control lever or rotation of the screw
control produces a change in output
speed that is non-linear. A typical
speed-control curve of a Zero-Max
Drive under full rated load is shown
in the chart below.
100
80
60
40
20
At Full Rated Load
r--
r--
And
1800 RPM Input Speed
,,,
V
/
,....
~
~
0510 15 20 25 30 35 40 45 50
-
/
I/
/
4
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