Joyce Machine Screw Jacks - Manual (Page 10)

10
3-3 Specifications
Model
Number
WJ250 WJ500 WJ1000
WJ51
WJ201
(R)WJT62
(R)WJT122
(R)WJT242
(R)WJT252
D(R)WJ62
D(R)WJ122
D(R)WJ242
WJ63
WJ123
WJ243
WJ253
DWJ63
DWJ123
DWJ243
WJT65
WJT125
WJT245 WJT255
DWJ65
DWJ125
DWJ245
Capacity 250 lbs. 500 lbs.
1,000
lbs.
1 TON 2 TON 2 TON 3 TON 3 TON 5 TON 5 TON 5 TON
Lifting
Screw
Diameter
(inches)
1/2 1/2 5/8 3/4 1 1 1 1 1 1/2 1 1/2 1-1/2
Thread
Pitch/Lea
d (inches)
.125
Pitch
Stub
Acme
.125 Pitch
.250 Lead
Stub Acme
.125
Pitch
Stub
Acme
.200
Pitch
Acme
.250 Pitch
Acme
.250 Pitch
.500 Lead
Acme
.250 Pitch
Acme
.250 Pitch
.500 Lead
Acme
.375 Pitch
Stub Acme
.250 Pitch
Acme
.250 Pitch
.500 Lead
Acme
Worm
Gear
Ratio
5:1 5:1 5:1
5:1
20:1
6:1
12:1
24:1
25:1
6:1
12:1
24:1
6:1
12:1
24:1
25:1
6:1
12:1
24:1
6:1
12:1
24:1 25:1
6:1
12:1
24:1
Worm
Shaft
Turns for
1" Travel
40 20 40
25
100
24
48
96
100
12
24
48
24
48
96
100
12
24
48 16
32
64
100
12
24
48
Tare
Torque
Inch-lbs.
1 1 1 3 4 4 6 6 10 10 10
Starting
Torque
Inch lbs.
.025W* .041W* .030W*
.038W*
.017W*
.041W*
.025W*
.018W*
.015W*
.057W*
.035W*
.025W*
.040W*
.025W*
.017W*
.0155W*
.055W*
.034W*
.024W* .065W*
.041W*
.029W*
.022W*
.072W*
.045W*
.033W*
Operating
Torque †
(inch lbs.)
.018W*
@ 500
RPM
.030W*
@ 500 RPM
.021W*
@ 500
RPM
.026W*
.009W*
@ 500
RPM
.028W*
.015W*
.009W*
.0085W*
@ 500 RPM
.039W*
.022W*
.013W*
@ 500 RPM
.029W*
.016W*
.009W*
.009W*
@ 500 RPM
.041W*
.022W*
.013W*
@ 500 RPM
.044W*
.025W*
.015W*
@ 300 RPM
.011W*
@300
RPM
.050W*
.028W*
.017W*
@ 300 RPM
Screw
Torque **
(inch lbs.)
.050W* .079W* .059W* .075W* .098W* .139 W* .098 W* .139 W* .151 W* .131W* .171 W*
Efficiency
Rating
approx.
23.0% 27.2% 19.9%
25.0%
15.9%
24.2%
22.0%
18.3%
17.0%
33.7%
30.5%
25.4%
24.3%
22.2%
18.5%
17.8%
33.8%
30.7%
25.6% 23.0%
20.6%
16.7%
13.4%
26.8%
23.9%
19.6%
Basic
Jack
Weight
(lbs.)
1.2 1.3 1.3 6 15 15 17 17 32 32 32
Add to
Basic
Jack
Weight
(lbs.) for
each
Additional
1" of
Travel
0.1 0.1 .0.1 .3 .3 .3 .4 .4 .7 .7 .7
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