®
Installation, Operating |
Translating Ball |
and Maintenance |
Screw Actuators |
Instructions |
|
1/2 ton through 50 Ton
Publication Part No. SK-2373
Caution
This manual contains important information for the correct installation, operation and maintenance of the equipment described herein. All persons involved in such installation, operation, and maintenance should be thoroughly familiar with the contents. To safeguard against the possibility of personal injury or property damage, follow the recommendations and instructions of this manual and keep it for further reference.
Warning
The equipment shown in this manual is intended for industrial use only and should not be used to lift, support, or otherwise transport people.
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Contents |
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Section I |
General Information ................................................................................................................. |
3 |
1-1. |
General ..................................................................................................................................... |
3 |
1-2. |
Applications.............................................................................................................................. |
3 |
1-3. |
Table of Specifications ............................................................................................................. |
3 |
1-4. |
Important Precautions............................................................................................................... |
3 |
1-5. |
Warranty and Warranty Repair ................................................................................................. |
4 |
Section II |
Maintenance ............................................................................................................................. |
4 |
2-1. |
Lubrication ............................................................................................................................... |
4 |
2-2. |
Rebuild Procedure .................................................................................................................... |
5 |
2-3. |
Required Tools.......................................................................................................................... |
5 |
2-4. |
Disassembly.............................................................................................................................. |
5 |
2-5. |
Cleaning.................................................................................................................................... |
5 |
2-6. |
Inspection ................................................................................................................................. |
6 |
2-7. |
Assembly .................................................................................................................................. |
6 |
Section III |
Illustrated Parts List.................................................................................................................. |
8 |
3-1. |
General ..................................................................................................................................... |
8 |
3-2. |
Parts List for 2800 and 9800 Series Ball Screw Actuators....................................................... |
8 |
Figure 3-1. |
Exploded Illustration 2800 and 9800 Series Ball Screw Actuators.......................................... |
9 |
Section I
General Information
1-1. General
This manual contains maintenance instructions for Duff-Norton translating ball screw actuators. It describes and details procedures for installation, disassembly, cleaning, inspection, and assembly of these actuators.
1-2. Applications
The actuators described and illustrated in this manual are intended for industrial use only and should not be used to lift, support or otherwise transport people unless you have a written statement from Duff-Norton which authorizes the specific actuator unit, as used in your application, as suitable for moving people.
1-3. Table of Specifications
These actuators are intended for a clean, noncorrosive environment with ambient temperatures ranging from -20 to 200 ° F. If your environment is dirty and/or contains abrasive particles it is important to protect the screw with a boot. If your atmosphere is corrosive it is important to specify a noncorrosive material or finish. Duff-Norton can provide stainless steel, nickel plated or epoxy coated actuators. If your duty is high or your use severe, more frequent lubrication should be employed. DuffNorton publishes a Mechanical Actuator Design Guide, Catalog No. 2003, which you may find helpful in the selection and application of mechanical actuators. If you need additional help, please contact Duff-Norton at (800) 477-5002.
Standard Actuator |
Upright |
28631 |
2802/9802 |
28021/98021* |
28003/98003 |
9805 |
98051† |
9810 |
98101‡ |
9820 |
9825 |
2860 |
Model Numbers |
Inverted |
28630 |
2801/9801 |
28011/98011 |
28002/98002 |
9804 |
98041 |
9809 |
98091 |
9819 |
9824 |
2859 |
Special Actuator |
Upright |
38631 |
3802/9802 |
3802/9802 |
38003/108003 |
10805 |
0805 |
10810 |
10810 |
10820 |
10825 |
3860 |
Model Numbers |
Inverted |
38630 |
3801/9801 |
3801/9801 |
38002/108002 |
10804 |
10804 |
10809 |
10809 |
10819 |
10824 |
3859 |
Rated Load (tons) |
|
1/2 |
2 |
2 |
3 |
5 |
5 |
10 |
10 |
20 |
25 |
50 |
Diameter of |
|
5/8 |
1 |
1 |
1 11/64 |
1 1/2 |
1 1/2 |
1 1/2 |
1 1/2 |
2 1/4 |
3 |
4 |
Lifting Scfew (inches) |
.200 Lead |
.250 Lead |
1.000 Lead |
.413 Lead |
.474 Lead |
1.000 Lead |
.474 Lead |
1.000 Lead |
.500 Lead |
.660 Lead |
1.000 Lead |
|
Closed Height (inches) |
5 |
7 1/2 |
7 1/2 |
9 1/4 |
10 3/4 |
10 3/4 |
10 3/8 |
10 3/8 |
16 1/2 |
19 3/4 |
25 3/8 |
|
Base Size (inches) |
|
2 1/4 x 4 |
3 1/2 x 7 |
3 1/2 x 7 |
3 1/2 x 7 |
6 x 8 |
6 x 8 |
7 1/2 x 8 3/47 1/2 x 8 3/48 1/4 x 11 |
10 1/4 x 13 3/4 |
9 3/4 x 19 3/4 |
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Std Ratio |
5:1 |
6:1 |
6:1 |
6:1 |
6:1 |
6:1 |
8:1 |
8:1 |
8:1 |
10 2/3:1 |
10 2/3:1 |
Worm Gear Ratios |
Optional |
20:1 |
12:1 |
24:1 |
12:1 |
24:1 |
24:1 |
24:1 |
24:1 |
24:1 |
32:1 |
32:1 |
|
Optional |
— |
24:1 |
— |
24:1 |
— |
— |
— |
— |
— |
— |
— |
|
Std Ratio |
25 |
24 |
6 |
14.526 |
12.667 |
6 |
16.888 |
8 |
16 |
16.16 |
10.66 |
Turns of Worm |
Optional |
100 |
48 |
24 |
29.052 |
50.667 |
24 |
50.667 |
24 |
48 |
48.48 |
32 |
For 1˝ Raise |
Optional |
— |
96 |
— |
58.104 |
— |
— |
— |
— |
— |
— |
— |
|
Std Ratio |
1/3 |
2 |
2 |
2 |
4 |
4 |
5 |
5 |
5 |
8 |
15 |
Maximum H.P. |
Optional |
1/6 |
3/4 |
1/2 |
3/4 |
3/4 |
3/4 |
1 1/2 |
1 1/2 |
1 1/2 |
2 1/2 |
6 |
Per Actuator |
Optional |
— |
1/2 |
— |
1/2 |
— |
— |
— |
— |
— |
— |
— |
Starting Torque |
Std Ratio |
10.5 |
50 |
180 |
110 |
220 |
500 |
350 |
800 |
700 |
925 |
2,700 |
at Full Load |
Optional |
5.0 |
30 |
80 |
68 |
90 |
206 |
175 |
400 |
325 |
475 |
1,500 |
(lb-ins) |
Optional |
— |
25 |
— |
50 |
— |
— |
— |
— |
— |
— |
— |
Running Torque |
Std Ratio |
9.5 |
45 |
160 |
100 |
180 |
410 |
300 |
700 |
650 |
825 |
2,200 |
at Full Load |
Optional |
4.5 |
25 |
70 |
60 |
80 |
183 |
150 |
290 |
300 |
425 |
1,200 |
(lb-ins) |
Optional |
— |
20 |
— |
45 |
— |
— |
— |
— |
— |
— |
— |
|
Std Ratio |
65 |
59 |
59 |
59 |
70 |
70 |
65 |
65 |
61 |
60 |
55 |
Actuator Efficiency |
Optional |
38 |
44 |
33 |
44 |
39 |
39 |
42 |
42 |
44 |
39 |
33 |
Rating (%) |
Optional |
— |
33 |
— |
33 |
— |
— |
— |
— |
— |
— |
— |
Weight with Base |
|
2.75 |
20 |
20 |
21 |
40 |
40 |
50 |
50 |
115 |
235 |
520 |
Raise of 6˝ (lbs) |
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Weight for Each |
|
0.1 |
0.3 |
0.3 |
0.4 |
0.9 |
0.9 |
0.9 |
0.9 |
1.5 |
2.9 |
5.0 |
Additional 1˝ of |
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Raise (lbs) |
|
|
|
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|
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|
Hold-Back Torque |
Std Ratio |
1 |
2 |
2 |
7 |
8 |
8 |
11 |
11 |
24 |
24 |
92 |
at Rated Load |
Optional |
0.5 |
1 |
0.5 |
2 |
0.5 |
0.5 |
0.5 |
0.5 |
2 |
2 |
33 |
(lb-ft) |
Optional |
— |
0.5 |
— |
0.5 |
— |
— |
— |
— |
— |
— |
— |
Note: Hold back torque is restraining torque at the worm shaft, to keep load from running down. *Dimensionally same as Model 2802/9802
† Dimensionally same as Model 9805
‡ Dimensionally same as Model 9810
1-4. Important Precautions
To ensure that actuators provide good service over a period of years, the following precautions should be taken:
1.Select an actuator that has a rated capacity greater than the maximum load that may be imposed on it.
2.The structure on which the actuators are mounted should have ample strength to carry the maximum load, and should be rigid enough to prevent undue deflection or distortion of the
actuator supporting members.
3.It is essential that the actuators be carefully aligned during installation so that the lifting screws are perfectly plumb and the connecting shafts are exactly in line with the worm shafts. After the actuators, shafting, gear boxes, etc., are coupled together, it should be possible to turn the main drive shaft by hand. If there are no signs of binding or misalignment, the actuator system is then ready for normal operation.
4.The ball screw actuators should have a greater raise than is needed in the actual installation. Should it be necessary to operate the actuators to the extreme limits of travel, it should be done cautiously.
Caution
Do not allow actuator travel to go beyond catalog closed height of actuator or serious damage to internal actuator mechanism may result. Refer to table of specifications (par. 1.3) for closed height of respective units.
5.The worm shaft speed for these actuators should not exceed 900 RPM for heavy loads, or 1800 RPM for light loads of one-fourth (or less) of the actuator capacity.
6.The lifting screw should not be permitted to accumulate dust and grit on the threads. If possible, lifting screws should be returned to closed position when not in use.
7.The ball screw should be checked periodically for excessive backlash and spalling of race ways.
8.The lubrication procedures for normal and severe service conditions, as described in Section II, paragraph 2-1, should be closely followed.
9.Due to high efficiency of Ball Screw actuators, a brake must be used in conjunction with motor selected to position actuator (refer to current
catalog for brake selection data).
1-5. Warranty and Warranty Repair
Subject to the conditions stated herein, DuffNorton will repair or replace, without charge, any parts proven to Duff-Norton’s satisfaction to have been defective in material or workmanship. Claims must be made within one year after date of shipment. Duff-Norton will not repair or replace any parts that become inoperative because of improper maintenance, eccentric loading, overloading, chemical or abrasive action excessive heat, or other abuse
Equipment and accessories not of Duff-Norton’s manufacture are warranted only to the extent that they are warranted by the manufacturer, and only if the claimed defect arose during normal use, applications and service. Equipment which has been altered or modified by anyone without Duff-Norton’s authorization is not warranted by Duff-Norton. EXCEPT AS STATED HEREIN, DUFF-NORTON MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
If you have any questions concerning warranty repair, please contact Customer Service for the name and address of your nearest Duff-Norton warranty repair facility.
Authorization for return must be received from Duff-Norton before returning any equipment for inspection or warranty repair.
Section II
Maintenance
2-1. Lubrication
Unless otherwise specified, actuators are shipped packed with grease which should be sufficient for one month of normal operation. For normal operation the actuator should be lubricated once a month, using Extreme Pressure grease Shell Oil Co. Shell Albida LC EP #2, (Shell Product Code 70311).
This grease has been thoroughly evaluated in Duff-Norton actuators and has demonstrated superior lubricating properties affecting both wear life and maximum duty cycle. Duff-Norton is not aware of an equivalent grease. If this grease is not available in your area please contact your local supplier for their recommendations. Greases containing molybdenum disulfide should never be used.
For severe service conditions, the actuators should be lubricated more frequently (daily to weekly depending on conditions). If duty is heavy,
an automatic lubrication system is strongly recommended.
Lubricate periodically the exposed ball screw grooves with a cloth dampened with a good grade 10W30 oil for most applications. An instrument grade oil should be used in dirty and heavy dust environments, while bearing grease is recommended for operating environments at extremely high temperatures. Extremes of temperature and other environmental conditions should be referred to Duff-Norton for recommended lubrication procedures.
Caution
Where the screw is not protected from airborne dirt, dust, etc., do not leave a heavy film of lubricant on the screw. Keep the ball screw barely damp with the lubricant. Inspect at regular intervals to be certain a lubricating film is present. Ball screws should never be run dry.
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