Self-contained chucks LVE - RÖHM - #9

4.1 Initial operation

4.1.1 Check whether jaw guides and piston of LVE chuck

are adequately lubricated at the lubrication nipple let into the basic jaws, or else carry out secondary greasing at the inner position of basic jaws, using acid-free grease (F 80).

F 80 grease: 1 kg jar Ident. No. 028975

500 gr., cartouch Ident. No. 308555

4.1.2 On the front flat side of the clamping chuck sits a locking screw with an internal hexagon. Behind the locking screw, the pilot-operated double check valve controls admission and de-aeration for the two pressure chambers and blocks the external pressure. It is very important that the valve system bore is lightly lubricated with oil, in order to make it easier for the valve system to run well. Over-greasing, as well as dirt in the valve bore, seriously impairs the operation of the clamping chuck and should be avoided.

Facing or turning of the self-contained heavy duty chuck is not allowed. Drilling the chuck on the front flat side may be undertaken only in accordance with the bore pattern page 33.

4.2. Maintenance

4.2.1 Cleaning and lubricating of the chuck

The uniform clamping force, precision and working life of a chuck essentially depend on periodic cleaning and ade­quate lubrication. Rust, hammer scales, casting dust and swarf generate friction and reduce the movement. The chuck should thus be greased every 20-30 working hours on the 3 basic jaw lubrication nipples, using F 80 grease. In this connection, the clamping chuck should be activated two or three times without a workpiece, so as to distribute the grease by moving the jaw out to the full extent of its stroke.

4.2.2 The valve system of the chuck should often be lubricated with oil, but only lightly, after the locking screw on the chuck front side has been removed. The double check valve is removed from the bore and the bore, together with the valve, is cleansed of dirt and, if necessary, foreign bodies.

4.2.3 The serration of the base and top jaws must be cleaned when the setting for hardened reversible jaws or soft top jaws is selected, as otherwise the concentricity is impaired.

4.2.4 Foreign substances such as rust, hammer scales, casting dust and fine swarf penetrate almost every chuck, although optimal sealing using hardened guide bushes in the passage and closed base jaws are available. Coolant washes lubricant away. For that reason, every chuck must be completely dismantled from time to time, cleaned and lubri­cated and, if necessary, the sealing rings have to be repla­ced. The interval before full maintenance can vary greatly, depending on dirt working its way in and the frequency of clamping, so that it is not possible to determine a generally valid rule.

4.3. Hardened reversable jaws and soft top jaws 4.3.1 Serration of jaws 1/16" x 90°.

Hardened reversible jaws must be used only as a set and in accordance with the packaging of the factory, as they are grind out on the chuck in sets. Normally, 1 set of hardened reversible jaws is ordered per clamping chuck. In the clamping and unclamping of the reversible jaws, numbered from 1 to 3, take care to ensure that the individual jaws are placed on the base jaw with the same markings in order to obtain good concentricity.

4.3.2 The soft top jaws are turned out on the chuck, in the same clamping position and under the operating pressure which is envisaged for the machining of the workpiece.

4.3.3 Hardened reversible jaws and soft top jaws are to be tightened as firmly as possible. Inadequately tightened top jaws cause big concentricity errors! Use only fixing screws from strength class 10.9 (10K).

4.4.1 Unscrew both pneumatic angular swivel joints from the suspension ring and remove self-contained power operated chuck from spindle head.

4.4.2 After screwing out the 3 hexagon socket screws (1), pull the suspension ring backwards off the chuck in 3 parts (4 and 5, 6, or 3, 7 and 8).

4.4.3 Dismantle pilot-operated double check valve system (10) by carefully screwing out the locking screw with the O-ring (9).

Check all O-rings in system for wear and replace if necessary.

4.4.4 Screw out srews (11) on chuck pick-up - cover plate (12), screw 2 screws into the threaded bores present and thus press off the cover plate.

4.4.5 Remove Seeger ring (13) in front of piston cover (14).

4.4.6 Screw two screws into available threaded bores and pull out piston cover (14).

4.4.7 Slacken off 3 screws (15) of guide bush (16) and pull bush out forwards by tapping the rear of the chuck lightly.

4.4.8 Dismantle sealing disc (19) fixed by screws (17) and take out the O-ring (20) sealing the pressure chamber.

Do no lose sealing rings (18) under screws (17)!

4.4.9 The piston (21) can be pulled out from the chuck body, and the base jaws (22) from the base jaw guides. The piston and the jaws can then be moved inwards through the piston bore of the chuck body and taken off the equipment.

Both the base jaws (22) and the base jaw guides are marked 1, 2 and 3, so as to ensure they are put back into the same position at assembly, and that they have the same concentricity. Hardened base jaws merely have 1, 2 or 3 notches for identification in the T-groove.