Joyce RWB3250 - Manual (Page 13)

13
3-5 Specifications
Model
Number
WB810
WB2410
HWB810
HWB2410
WB820
WB2420
WB1130
WB3230 WB1150
WB3250
Capacity 10 TON 10 TON 20 TON 30 TON 50 TON
Lifting Screw
Diameter
(inches)
2 2 2 1/4 3 4
Thread
Pitch/ Lead
(inches)
.5 1 .5 .66 1.00
Worm Gear
Ratio
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 8
24
16
48 16.67
48.48 11
32
Tare Torque
(inch/Lbs.)
20 20 40 60 100
Starting
Torque
(inch/Lbs.)
.023W*
.011W* .047W*
.023W* .024W*
.012W*
.027W*
.016W*
.038W*
.020W*
Operating
Torque †
(inch lbs.) @
Worm RPM
.019W*
.008W*
@200 RPM
.039W*
.016W*
@ 200 RPM
.020W*
.009W*
@ 200 RPM
.020W*
.009W*
@ 200 RPM
.029W*
.012W*
@ 200 RPM
Screw Torque
** (inch lbs.)
.088W* .177 W* .088 W* .117 W* .177 W*
Efficiency
Rating
% approx.
50.7
40.3 50.7
40.3 47.4
35
48
35 49.3
37.5
Ball Screw
Life at Rated
Load (Inches
travel X 1000)
729 1423 121 343 614
Worm Holding
Torque ††
.009W*
.003W* .018W*
.006W* .009W*
.003W* .009W*
.003W* .013W*
.005W*
Basic Jack
Weight (lbs.)
62 62 105 220 460
Add to Basic
Jack Weight
(lbs.) for each
Additional 1"
of Travel
1.4 1.4 2.6 3.2 4.8
**Screw torque is the required torque to keep the screw from rotating
† Operating torque is the torque required for a given load (increases as speed decreases)
†† Torque required to prevent worm (input shaft) from backdriving.