Duff-Norton Machine Screw Rotating 500lb - 1 Ton - Manual (Page 3)

3
General Information
1-1. General
This manual contains maintenance instructions for Duff
Norton
1/4 through 1- ton rotating machine screw actua-
tors. It describes and details procedures for installation,
disassembly, cleaning, inspection, and assembly of these
actuators.
1-2. Applications
The actuators described and illustrated in this manual are
intended for industrial use only and should not be used to
lift, support or otherwise transport people unless you
have a written statement from Duff-Norton which autho-
rizes the specific actuator unit, as used in your applica-
tion, as suitable for moving people.
Section I
1.3. Specifications
Table 1. 1/4-ton through 1-ton Series Rotating Machine Screw Actuators
*
For loads from 25% to 100 % of Actuator load rating. Torque requirements are approximately proportional to the load.
Actuator No. Upright UM2556 UM2626 UM2502
Standard Inverted DM2556 DM2626 DM2502
Actuator No. Upright UM3056 UM3626 UM3502
Special Inverted DM3056 DM3626 DM3502
Rated Load (lb) 500 1000 2000
Diameter of 1/2 5/8 3 / 4
Lifting Screw .250 Pitch .125 Pitch .200 Pitch
(inches) ACME ACME ACME
Base Size (in.) 2 1/4 x 4 2 1/4 x 4 2 3/4 x 5
Worm Gear Std. Ratio 5:1 5:1 5:1
Ratios Optional - - 20:1
Turns of Worm Std. Ratio 20 40 25
for 1" Raise Optional - - 100
Maximum H.P. Std. Ratio 1/3 1/3 1/2
Per Actuator Optional - - 1/4
Torque at Full Std. Ratio 13 21 55
Load* (in-lbs) Optional - - 25
Jack Efficiency Std. Ratio 33.0 20.0 24.5
Rating (%) Optional - - 14.0
Weight with Base
Raise of 6" (lb)
2.3 2.3 5.0
Weight for Each
Additional 1" Raise (lb)
0.1 0.1 0.3