Joyce DSWJ2410 - Manual (Page 10)

10
3.3 Specifications (continued)
Model Number
SWJ815
SWJ2415
DSWJ815
DSWJ2415
SWJ820
SWJ2420
DSWJ820
DSWJ2420
SWJ1125
SWJ3225 DSWJ1125
DSWJ3225
Capacity 15 TON 15 TON 20 TON 20 TON 25 TON 25 TON
Lifting Screw
Diameter
(inches)
2 1/4 2 1/4 2 1/2 2 1/2 3 3/8 3 3/8
Thread
Pitch/Lead
(inches)
.500 pitch
Acme
.333 Pitch
.666 Lead
Acme
.500 pitch
Acme
.375 Pitch
.750 Lead
Acme
.666 Pitch
Stub Acme
.5625 Pitch
1.125 Lead
Acme
Worm Gear
Ratio
8:1
24:1
8:1
24:1
8:1
24:1
8:1
24:1
11:1
32:1 11:1
32:1
Worm Shaft
Turns for 1"
Travel
16
48 12
36 16
48 10.67
32
16
48 9.5
28.5
Tare Torque
Inch-lbs.
45 45 60 60 75 75
Starting Torque
Inch lbs.
.069W*
.036W* .079W*
.041W* .075W*
.039W* .088W*
.046W* .088W*
.053W* .106W*
.063W*
Operating
Torque †
(inch lbs.)
.047W*
.020W*
@ 200 RPM
.058W*
.025W*
@ 200 RPM
.015W*
.022W*
@ 200 RPM
.061W*
.026W*
@ 200 RPM
.055W*
.025W*
@ 200 RPM
.067W*
.030W*
@ 200 RPM
Screw Torque **
(inch lbs.)
.210W* .244W* .227W* .272W* .313W* .384W**
Efficiency
Rating approx.
21.1%
16.6% 34.4%
27.0% 19.6%
15.4% 24.5%
19.3% 18.3%
13.5% 25.1%
18.6%
Basic Jack
Weight (lbs.)
59 59 77 77 164 164
Add to Basic
Jack Weight
(lbs.) for each
Additional 1" of
Travel
1.4 1.4 1.9 1.9 3.1 3.1
Series DWJ may lower under load. External locking systems are required
W* = Load in pounds
**Screw torque is the torque required to keep the screw from rotating.
† Operating torque: torque required for a given load increases as speed decreases