Lehmann Rotary Tables Publications Main catalog (PGD inside!) - Page 86

Technical explanations Definition of the terms used in this catalog Overview 4 Speed EA + M Duty cycle (ED) [%] …refers to the duration of the movement per unit of time according to the DIN/VDE 0520 Standard. The pL rotary tables are designed for intermittent duty (positioning operation) S3 at ED 20%, but with a backlash time of 1 minute. If these conditions are exceeded by the respective application, the drive data must be reduced accordingly. T1 TF Rotational spindle speed (n spi) [min-1] …always refers to the maximum possible rotational speed of the spindle – while complying with the duty cycle ED – with the corresponding motor – with the pL standard spindle load (cubic) MOT / KAB WMS / CNC T2 / T3 Cycle time 90° / 180° (t 90° / t 180°) [sec] …refers to the time required for the entire dividing / indexing operation for a 90°/180° movement – Dividing/indexing operation STANDARD pL = unclamping and clamping monitored using a pressure sensor. During clamping, the clamped signal is sent as soon as a value of 100 bar has been reached. Thus, the machine can already move before the full clamping pressure is applied. If the full clamping pressure has not been reached after 2 sec, the clamped signal is canceled. Everything is controlled by the blackBOX. – Dividing/indexing operation OPTIMIZED = as standard, but the clamped signal is queried only prior to the feed movement. This operation requires adjustment of the respective machine PLC and is not included in the pL scope of delivery. 5 Spindle bearing RFX/LFX Axial force (F axial) [N] ..refers to the maximum permissible axial load on the spindle. It includes the workpiece, devices, machining forces and other forces resulting from the rotational and tilting movement. Workpiece clamping Pull-out torque (M tilt) [Nm] ..refers to the maximum permissible tiling load on the spindle, measured from the spindle face. It includes the workpiece, devices, machining forces and torques resulting from the rotational and tilting movement. Transport load (sl max) [kg] …refers to the total, maximum permissible load which is installed starting from the spindle nose and performs a rotational movement together with the spindle (device and workpiece). This load does not correspond to the pL standard spindle load. General accessories Radial and axial runout (ro con/ax) [mm] …refers to the maximum deviation occurring in the axial (axial runout) or radial (radial runout) direction when measured over 360°. Measured in each case on the maximum possible diameter of the spindle nose. 6 Clamping Technology / engineering Clamping torque (M clamp) [Nm] …refers to the maximum permissible torque load on the spindle nose during active clamping (6 bar air pressure). The pL clamping is extremely rigid. Depending on the load, there is also a setting behavior in addition to a usual elasticity. We distinguish between three phases when progressing from zero load to maximum load. The setting behavior results in an irreversible torsion after unloading as follows: – Phase 1 «normal» (approx. 1/3 to 1/2 of the permissible clamping torque) up to approx. 0.0015 mm* – Phase 2 «increased» (approx. 2/3 of the permissible clamping torque) up to approx. 0.005…0.01 mm* – Phase 3 «maximum» (up to 100% of the permissible clamping torque) up to approx. 0.035 mm* * For unilateral load, in relation to the spindle outside Ø of the respective rotary table. The indexing and repeat accuracy is not impaired by another positioning. 86 DIN / VDE 0520 S3, ED 20%