3 specifications (continued) – Joyce Machine Screw Jacks User Manual
Page 11
11
3.3 Specifications (continued)
Model
Number
WJ810
WJ2410
WJ2510
WJ2510
DWJ810
DWJ2410
WJ815
WJ2415
WJ2515
DWJ815
DWJ2415
WJ820
WJ2420
WJ2520
DWJ820
DWJ2420
Capacity
10 TON
10 TON
10 TON
15 TON
15 TON
15 TON
20 TON
20 TON
20 TON
Lifting
Screw
Diameter
(inches)
2
2
2
2 1/4
2 1/4
2 1/4
2 1/2
2 1/2
2 1/2
Thread
Pitch/Lead
(inches)
.500 Pitch
Acme
.25 Pitch
Acme
.333 Pitch
.666 Lead
Acme
.500 pitch
Acme
.250 pitch
.333 Pitch
.666 Lead
Acme
.500 pitch
Acme
.25 pitch
Acme
.375 Pitch
.750 Lead
Acme
Worm Gear
Ratio
8:1
24:1
25:1
8:1
24:1
8:1
24:1
25:1
8:1
24:1
8:1
24:1
25:1
8:1
24:1
Worm Shaft
Turns for 1"
Travel
16
48
100
12
36
16
48
100
12
36
16
48
100
10.67
32
Tare Torque
Inch-lbs.
20
20
20
30
30
30
40
40
40
Starting
Torque
Inch lbs.
.061W*
.030W*
.024W*
.070W*
.035W*
.069W*
.036W*
.026W*
.079W*
.041W*
.075W*
.039W*
.029W*
.088W*
.046W*
Operating
Torque †
(inch lbs.)
.043W*
.018W*
@200 RPM
.014W* @
200 RPM
..062W*
.026W*
200 RPM
.047W*
.020W*
@ 200 RPM
.015W*
@ 200 RPM
.058W*
.025W*
@ 200 RPM
.015W*
.022W*
@ 200 RPM
.016W*
.@ 200 RPM
.061W*
.026W*
@ 200 RPM
Screw
Torque **
(inch lbs.)
.195 W*
.161W*
.228 W*
.210W*
.178W*
.244W*
.227W*
.194W*
.272W*
Efficiency
Rating
approx.
23.1%
18.8%
11.3%
31.9%
25.9%
21.1%
16.6%
10.2%
34.4%
27.0%
19.6%
15.4%
9.4%
24.5%
19.3%
Basic Jack
Weight (lbs.)
43
43
43
59
59
59
77
77
77
Add to Basic
Jack Weight
(lbs.) for
each
Additional 1"
of Travel
1.3
1.3
1.3
1.4
1.4
1.4
1.9
1.9
1.9
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