Introduction:
Your Arnold Classic high pressure/high precision vise carries a lifetime warranty on quality and workmanship. It is the product of rigorous manufacturing, assembly and testing procedures. With appropriate use and care it will provide you with many years of outstanding service.

Diagrams and Parts List:
Click here for a diagram and parts list of the clamping mechanism
Click here for a diagram and parts list of the vise body and jaws

Safety Issues:
Each person involved in the unpacking, handling, operation and maintenance of this vise is required to read this service manual. This is to ensure safety at work compliance, and the correct understanding of the vise operation. The operator must be a minimum of 18 years of age, and must be trained in the correct use of this vise. The operator must have read and understood this instruction manual, and a printout should be kept at the place of operation for reference.

The operator should wear eye protection, work boots with steel toe protection and gloves.

Unpacking and Istallation:
Unpack the vise and move it with the use of a crane with a magnet or a sling, or using other safe lifting equipment. Care should be taken that the load is correctly distributed before fully lifting. The vise is wrapped in oiled wax paper for corrosion protection during shipment. Make sure that the vise is placed on a clean machine table and clamped safely into position as soon as the oiled wax paper is removed from its base.

Like with any precision tool use care when the vise has to be moved. The vise must be clamped firmly to the machine table to avoid movements during machining operations. Make sure that there is adequate room for unimpeded jaw movement. Keep the work area clean.

Cleaning and General Maintenance:
To ensure a long operational life and optimal performance it is essential that the vise be cleaned regularly. Remove chips and other debris after each machining cycle since it can affect operation.

Use coolant spray or air gun to clean the vise. The regular use of a small brush to clean the jaw ways is recommended. Industrial rags or paper can also be useful after a number of machining cycles and when there is dirt build up. Do not use chemical products which can damage the vise!

A. - Operating Features
The manual/hydraulic clamping mechanism is activated by a crank inserted into the housing (part 122). When the crank is turned, the threaded spindle (001) moves through the spindle shoe (040) pushing the movable jaw (033) until the jaws (036) meet the workpiece to be clamped. When the threaded spindle (001) encounters a predetermined resistance it stops turning, and the continued turning of the crank will makes the coupling disc (019) detach from the coupling body (121) and thus the torque rod (123), which is firmly attached to spindle sleeve (122) with a locking pin screw (124), will advance and consequently force the small piston (012) into the oil chamber (A) and create an overpressure. The pressure produced by the oil pushes the large piston (008) which in turn pushes pushrod (002). The pushrod through pressure plate (034) and movable jaw (033) transmits the power developed by the hydraulic differential mechanism to the clamping jaw. The maximum pressure is reached once the spindle sleeve (122) has advanced over the threaded cylinder (013) and stopped against the cylinder (003). At this point the pressure can not be increased any more. Hammering or the use of extensions ("cheater bars") will not increase the pressure and can damage the clamping mechanism.

B. - Hydraulic Power Adjustments
After some time it is possible that the pressure decreases due to oil leakage. If this is the case, then oil chamber A should be set by following the following steps:

1. Remove the clamping mechanism from the vise.
2. Remove the allen set-screw (004).
3. Drive the threaded spindle (001) forward by giving it one third of a turn in cylinder (003) until the threaded hole in the cylinder matches with the next slot on the main spindle.
4. Replace allen set-screw (004) to complete the adjustment procedure.

C. - Hydraulic Oil Filling Up:

1. Remove the clamping mechanism from the vise.
2. Remove the allen set-screw (004).
3. Unscrew the threaded spindle (001) being careful that the preset tension spring (006) and the bevel springs (007) do not pop off when the spindle is removed
4. Remove the allen set-screw (004)
5. Clamp the cylinder (003) and remove the threaded cylinder (013).
6. Keep the cylinder (003) in a vertical position and remove the small piston (012) upwards.
7. When filling up the oil-chamber A, a disk with the following dimensions must be used:
   

   Vise Model	Max. Disk Diameter	Disk Height
   90mm	27mm / 1.63"	11mm / 0.43"
   125mm & 160mm	35mm / 1.38"	8mm / 0.31"
   200mm	45mm / 1.77"	14mm / .55"

8. Place the cylinder (003) on a flat surface with its large opening on the disc, and with the help of a small pin, or using air pressure, push the large piston (008) forward until it stops against the disc. If air pressure is used for this purpose, hold the cylinder tightly to prevent it from moving.
9. Pour the hydraulic oil into the chamber until its level reaches the upper edge of the opening. Oil chamber A should be completely free of air bubbles. To accomplish this, stir the oil gently with a clean pick, and refill again to reach the level stated above if it were necessary. The hydraulic oil to be used should feature a viscosity of 6,5 E/50º, C type.
10. Now introduce gently the small piston (012) into cylinder (003) by its chamfered end pushing and turning it. The small piston (012) must be absolutely clean so as not to damage the small seal (011).
11. Hold cylinder (003) tight and then screw in the threaded cylinder (013). The hole in the threaded cylinder (013) has to line up with the slot in the oil chamber. If it does not, then unscrew the threaded cylinder (013) and give it a 180° turn and repeat. Once the matching has been accomplished, replace the allen set-screw (004) and tighten it firmly.
12. The bevel springs (007) are to be replaced as shown in the drawing.
13. Screw in the threaded spindle (001) with pushrod (002) and preset tension spring (006) into cylinder (003) until this group can not be turned by hand any further. Next advance the threaded spindle (001) by screwing it into cylinder (003), until the second slot on the spindle matches with the threaded hole in the cylinder. Screw (004) is now to be replaced and tightened to complete the assembly.
14. After having filled up the hydraulic spindle with the proper oil, it should be cycled several times before it is returned to service.

D. - Using the Arnold Manual/Hydraulic Clamping Mechanism on Custom Fixtures:
A custom bushing is available to use the clamping mechanism on other fixtures.

Please be aware of than the Arnold clamping mechanism will only produce high pressure on VERY RIGID FIXTURES since the travel generated by the hydraulic bower booster is only 1.8mm (.07"). We suggest the use of a 0.2 to 6 ton pressure cell to check the pressures generated.

Note:
If it were necessary to disassemble the spindle sleeve (122), insert the locking pin screw (124) into the threaded housing (123) before removing it. After this procedure, the sleeve can be removed by unscrewing the locking pin screw (124).

ARNOLD POWER PRESET CONTROL
This clamping mechanism is equipped with a power presetting control which allows to choose the appropriate pressure for different operations or work pieces.

Operation:
To select the desired clamping pressure, hold the handle to prevent the screw from turning, then turn the cylinder cap and line up the desired number with the line on the screw mechanism. Each number indicates a clamping pressure (see graphic). Choosing 0 will disable the power boost mechanism and operate your high pressure vise like a conventional screw-type vise.

Approx. Power Settings for 125mm ans 160mm Vises

Approx. Power Settings for 200mm Vises

Diagrams and Parts List:
Click here for a diagram and parts list of the power regulator