3 specifications (continued) – Joyce Machine Screw Jacks User Manual

Page 11

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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

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