Selection - Calculation - ZIMM - #2

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© by ZIMM Austria 2009 2 Selection - Checklists - Calculations Parallelism and angularity Pay attention to the parallelism and angularity of mounting surfaces, gears, nuts and guides to each other. The same applies for exact alignment of gears, pedestal bearings, connecting shafts and motors to each other. Guides Guide bush play in the screw jack gearbox can be between 0.2 mm and 0.6 mm depending on the size. This is just a secondary support and does not replace a linear guide system to support side forces. - Frequency converter: Serves to increase the motor speed to above 1500. This variant is only usable for movements without load or with light loads. Slower: - Motors with more poles/lower speed (6, 8, 10 or 12 poles) - Frequency converter (attention: a suitable cooler for the motor is required for slow operation below 25 Hz, e.g.: external fan) - Geared motor (attention: maximum input torque) - Bevel gearbox with gear reduction (only possible for certain applications) Temperature and operating period Screw jacks are generally not designed for continuous operation. Refer to the diagram on the Gearbox Pages (Section 4 - Catalogue 2008) for the maximum #operating periods (ED). These are reference values but various according to usage conditions. In borderline cases, select a larger screw jack or contact our project technicians. Operating temperatures should not exceed 80°C (higher on request). Rotation protection On the Version S with standing spindle, the spindle is free running within the gear (worm wheel). The spindle must be protected against rotation – otherwise it would rotate due to the friction in the worm wheel. This can be achieved by fixing the spindle to an external guidance system or by using our rotation protection (VS) (in a protective tube). Design and specification The customer confirm selection and dimensioning because we are not familiar with the design criteria such as installation location and type of application. We can provide support during selection and layout on request and make a proposal with subassemblies drawing and calculation based on your application parameters. You can then examine and approve this drawing with parts lists. These then serve as basis for production and preassembly and assist your employees during assembly and fitting. We guarantee the quality of the machine elements as described in the catalogue. The gearboxes are designed for industrial use with loads and operating periods as specified in the catalogue. Please contact our project technicians for demands going beyond these specifications. We generally deliver according to our current Terms of Sales and Delivery (Section 10 - Catalogue 2008). Lifting speed Several options are available to influence the lifting speed: Faster: - Double-pitch screw (not generally in stock): Doubles the speed (attention: max. input torque, not self-locking - brake required!) - Larger spindle diameter for R version (spindle from next larger size): Bigger pitch / higher lifting speed depending on gearbox size - Ball screw spindle: Various pitch options available (attention: not self-locking, brake required!) Construction Advice i m/min V Lifting speed v = Spindle pitch P Gear reduction i x motor speed n