Fitting the bellows
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Accessories for screw jacks The bellows protect the screw against dirt and moisture. PLEASE NOTE: The bellows must not be compressed to less than the ZD dimension nor extended beyond the AZ dimension. If the stroke is longer than 1000 mm, fit a bellows with an extension block. Take into consideration that when the bellows is fitted horizontally it must not touch the screw: Risk of serious damage! Use support rings to avoid such damage. Protect the screws, especially during on-site assembly, against: building site dust, grinding dust from angle grinders, AZ=Extension ZD=Compression weld spatter, etc. Protect the bellows against direct sunshine. Take into consideration also that the thermal insulation effect of the bellows reduces the maximum duty cycle of the screw jack.

Accessories for screw jacks Bellows FB Bellows Z-..-FB, polygonal AZ=Extension ZD=Compression Material: Polyurethane-coated polyester fabric type OZ-23, temperature stability -15°C to +70°C, incl. 2 galvanised hose clips. For screw extensions, see Sections 2+3 CAUTION: For special bellows, dimensions ZD, AZ and DZ may be different! IMPORTANT! When ordering, please specify: When mounted horizontally, the bellows must be fitted with suitable support rings, so as to avoid wear due to rubbing against the trapezoidal thread of the screw. For lengths longer than 1000 mm, an extension block is...

Accessories for screw jacks Spiral spring attachment Spiral spring cover attachment for types SN/SL Forked end Z-..- GK Centring bushing Spiral spring cover Spiral spring cover attachment for types RN/RL Opposed bearing plate Z-..- GLP Fixing flange Z-..- BF Centring bushing Centring bushing Spiral spring cover Spiral spring cover Duplex nut Z-..- DM Centring bushing Spiral spring cover Fitting instructions: Spiral springs can be used on chip-generating and non-chip generating machines. The illustrations show how to fit different types of spiral spring covers to various screw jacks....

Accessories for screw jacks Spiral spring cover SF Material: SF: Spring band steel, blued (on request we can also supply versions in stainless steel) Centring bushing: Plastic (other materials on request) CAUTION: The spring travel quoted is the maximum possible. For practical operation, please allow a margin of safety to prevent damage! We recommend preparation of a drawing to determine the fitting position and dimensions of spiral springs. Spiral spring Least diameter D1 Greatest length AZ* Least length ZD H=horizontal installation V=vertical installation Centring bushing Inner diameter...

Accessories for screw jacks Pivoting – Z-5 to Z-25 Pivot mounts LB Integrated pivot bearing Simple and economical design: Pivot bushes are incorporated in the gearbox housing. Lubrication The bronze bushes are PTFE-coated and therefore require no lubrication in normal service. We recommend regular lubrication for high loadings. Axis of pivoting R (at right angles to the drive) Design tip For large motors, long strokes and high load cycles, the variant with the pivot bearing plate KAR is preferable, because the weight of the motor is then taken by the pivoting points and does not affect the...

Accessories for screw jacks Pivoting – Z-35 to Z-1000 Pivot mounts LB Integrated pivot bearing Simple and economical design: Pivot bushes are incorporated in the gearbox housing. Axis of pivoting P (parallel to the drive) Lubrication The bronze bushes are PTFE-coated and therefore require no lubrication in normal service. We recommend regular lubrication for high loadings. Material: Cast steel, quenched and tempered, corrosion-resistant Refer to the permissible loads listed in Section 8 From Z-500 the gearbox is mounted the opposite way round, since the footplate is broader than the rest of...

Accessories for screw jacks For the S and R version Handwheel HR Part no. HR-80 HR-125 HR-160 HR-200 HR-250 Material: Aluminium, plastic (handle) Design: No more than max. 50 - 60 N force should be required at the handle Ordering example: HR-125-11-N Diameter Bore N = with keyway and set screw V = only pilot hole incl. screws Material: Hard anodised aluminium M5x55 Screws are included with the protective cap incl. screws Material: Z-5 to Z-150: PA6 GF15, up to 120°C, briefly 180°C Material: Z-250 to Z-1000: POM, up to 100°C, briefly 140°C Suitable for screw jacks Z, GSZ, MSZ (MSZ up to size...

Accessories for screw jacks For the S and R version Fixing strips BFL Jack screw centreline Identical to the previous MSZ types Material: Steel, corrosion-resistant / GSZ-2-BFL: Stainless steel Incl. screws 4 Pivot bearing plate KAR Identical to the previous MSZ types Material: Steel, corrosion-resistant / GSZ-2-KAR: Aluminium, corrosion-resistant Incl. screws 1) Pivot mounts GSZ-2-LB available (Z-5/10-LB with shorter journals) CAUTION: 2 mm narrower than Z- .. -KAR

Accessories for screw jacks Connecting shaft VWZ Standard bores “d” [mm] VWZ-30 VWZ-40 VWZ-60 VWZ-60V VWZ-80 VWZ-100 Dimensions, technical data Size Clamping screw Torsional stiffness *BK = shaft extension clamping length Torques Size The max. torque is limited either by the star or by the clamping force Shafts with split shells - Split shells permit easy radial insertion - High concentricity - High clamping forces - Low moment of inertia - Stepless adjustment facility thanks to the clamp hub rather than a fitted drive key - Drive keyway available on request - Material: High-tensile...

Accessories for screw jacks VWZ length calculation (identical for Z and GSZ) LA = External length (incl. coupling) MA = Distance between centres of gearboxes *cannot be fitted with pivot mounts LB Maximum length - dependent on speed Lateral offset: Angular offset: Axial offset: max. permissible free length (LA dimension) in mm ca. +/- 1 bis 2 mm

Accessories for screw jacks VWZ with rigid hub, for pedestal bearing use flexible hub *BK=shaft extension clamping length MA distance between centres *cannot be fitted with pivot mounts LB Pedestal bearing Pedestal bearing: YES/ NO? The installation situation is very important when selecting shaft dimensions. For example, the cost of a larger diameter connecting shaft not requiring additional pedestal bearing support can be considerably less than the cost of a smaller connecting shaft requiring costly sub-structures for the additional pedestal bearing. For this version we use the rigid hub...