Catalogue - Power chuck KFD-HS - RÖHM - (Version JPG)

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Safety instructions and guidelines for the use of power-operated clamping devices

éléments, position fixing éléments, point centres, etc.) should be used exclusively for clamping those types of workpiece for which they are designed and in the manner intended. Failure to observe this can lead to injury or material damage resulting from insufficient clamping forces or unfavourable positioning. Written permission should therefore be obtained from the manufacturer if it is intended to clamp other / similar workpieces with the same clamping set.

7.Checking clamping force / Clamping fixtures without permanent application of pressure

1.Checking clamping force (general) Static clamping force measurement fixtures must be used in accordance with § 6.2 No. d) EN 1550 to check the service condition at regular intervals in accordance with the servicing instructions. Clamping force should therefore be inspected after approx. 40 operating hours (i.e. regardless ofclamping frequency). Special clamping force measuring jaws or fixtures (pressure measurement cells) should be used if necessary for this purpose.

2.Clamping fixtures without permanent application of pressure

Clamping fixtures exist where the connection to the hydraulic or pneumatic pressure source can be interrup-ted during operation (e.g. for LVE / HVE). This can result in a gradual drop in pressure. Clamping force can be reducedsomuchasaresultthattheworkpieceisno longer adequately clamped. Clamping pressure should therefore be activated for at least 10 seconds every 10 minutes for safety reasons to compensate for this loss of pressure.

This also applies after long periods of inoperation (e.g. where machining has been interrupted overnight and only resumed the following morning).

and / or electrical jogging mode (respective control should be possible!)

The type of auxiliary setup fixture employed depends on the machine being used and should be purchased separately if necessary!

The machineusermustensurethateveryriskofinjurycaused by movement of the clamping medium is ruled out during the entire clamping procedure. 2-handed actuation for clamping should be provided for this purpose, or, even better, suitable safety features. The stroke monitor should be adjusted to suit the new situation if the clamping medium is changed.

10. Manual loading and unloading

Mechanical risks to fingers in cases where clamping distances greater than 4 mm are involved must also be taken into consideration during manual loading and unloading procedures. This danger can be countered by

--the provision of an independently-actuated retention fixture (e.g. centring jaws with centre chucks and face clamping chucks),

--use of a workpiece loading aid (e.g. charging stock), or

-- a clamping movement reduction (e.g. by throttling the hydraulicenergysupply)toclampingspeedsnotgreaterthan 4mms-1.

11. Fixing and replacing screws

Inferior replacements or inadequate fixing ofscrews which are being changed or become loose can lead to risks ofboth injury to personnel and material damage. It is therefore imperative that, unlessotherwiseexpresslyspecified, onlysuch torqueas expressly recommended by the screw manufacturer and suitable for the screw quality be applied when tightening fixing screws.

The following torque table applies for the common sizes M5 - M24 and qualities 8.8, 10.9 and 12.9:

**Recommended EDS clamping force measuring system: ^^^B

EDS 50 kpl. Id.-Nr. 161425

EDS 100 kpl. Id.-Nr. 161426

EDS 50/100 kpl. Id.-Nr. 161427


Qualit	M5	M6	M8	M10	M12	M14	M16	M18	M20	M22	M24
8.8	5,9	10,1	24,6	48	84	133	206	295	415	567	714	Nm
10.9	8,6	14,9	36,1	71	123	195	302	421	592	807	1017	Nm
12.9	10	17,4	42,2	83	144	229	354	492	692	945	1190	Nm

8.Rigidity of the workpiece to be clamped

The material to be clamped should possess a rigidity suita-ble for the clamping force involved and should only be minimally compressible if secure workpiece clamping under the machining forces which occur is to be ensured. Non--metallic material (e.g. plastic, rubber, etc.) may only be clamped and machined with the express written permis sion of the manufacturer! 9.Clamping movements Short distances are covered in brief periods of time under the exertion of (at times) extreme force (e.g. through clam-ping movements or, possibly, setup movements, etc). It is therefore imperative that drive elements intended for chuck actuation be deactivated in every case involving assembly or setup work. However, if clamping movement cannot be ruled out in setup mode and clamping distances aregreaterthan4mm

-- a fixed (or temporary) workpiece holding fixture should be mounted on the fixture or

-- an independently-actuated retention fixture (e.g. centring jaws with centre chucks and face clamping chucks) should be provided, or

-- a workpiece loading aid (e.g. charging stock), or

-- setup work should be carried out in hydraulic, pneumatic 10

All details in Nm

Screwquality12.9 should be selected in cases ofdoubtwhen replacing original screws. 12.9qualityshould beselected in all cases involving fixing screws for clamping inserts, top jaws, fixed stops, cylinder covers and similar elements. All fixing screws which, due to the purpose for which they are intended, are loosened frequentlyand mustthen be tightened again (e.g. during conversion work) should have their threads andthebearing surfaceoftheirheadscoated with alubricating medium every six months (grease paste). Even securely tightened screws can become loose under adverse outside conditions such as, for instance, vibrations. In order to prevent this happening, all safety-related screws (clamping fixture fastening screws, clamping set fastening screws etc.) must be checked and, ifnecessary, tightened at regular intervals.

12. Service work

Reliabilityoftheclamping fixturecan onlybeensuredifservice regulations in the operating instructions are followed exactly. The following should be noted in particular:

-- The lubricant recommended in the operating instructions should be used for lubricating. (Unsuitable lubricant can reduce the clamping force by more than 50%).

Power chuck KFD-HS - RÖHM - #10

Expansion mandrel, Gripper, Lathe center, Tool-holder, Electrical clamping head