ADDITIONAL INFORMATION ABOUT SHAFT CORE DATA SHEETS from Schmid & Wezel Hilsbach GmbH & Co. KG resistant . consistent . approved

Machined shafts Manual shafts Main direction of rotation Measured lengths for torques and torsions Maximum torque Special features Fracture torque Minimum permitted bending radius Maximum speed Cutting suitability Laser cutting Maximum impact / moment of force / internal friction Legal details

There is currently no standard to define the data, measurement methods or other features of shaft cores. This document should offer some assistance to better understand the data on our data sheets and determine the possible feasibility of the planned application in advance. The application’s function must always be tested. Adherence to all the critical values and details is still no guarantee of the entire shaft’s function and stability. Shaft cores may be manufactured in two different ways. Machined shafts Machined shafts are manufactured on winding machines. A winding machine consists of several...

Measured lengths for torques and torsions To determine the torques, the shaft cores are clamped on a test rig. The free length of the shaft core is generally 1000 mm. The shaft core is not turned during measurement; this is a static measurement. Maximum torque The shaft core leaves its extended position at this torque. The shaft core starts to bend (see image). If force is eased from the shaft core, it goes back to its starting position. There are shaft cores in which this bending motion is in the opposite direction to the preferred direction at a higher torque. The shaft core should only be...

Minimum permitted bending radius Flexible shafts can bent down maximal to a minimum bending radius before they snap off. The bending radius should always be chosen so that it is as large as possible. The following contingencies should be met: Speed <100 rpm: 1.30 Speed 100 - 999 rpm: 1.70 Speed >1000 rpm: 2.00 Example: a shaft core with the details 100 mm for a speed of 500 rpm should keep to a minimum bend radius of 170 mm. (100 mm * 1.70 = 170 mm) Maximum speed This is generally not given in the data sheet. The maximum speed of a shaft core depends on many factors. The following factors influence...

Heat treatment after winding changes the properties of the shaft core. Heat treatment can make a machined shaft suitable for cutting. Heat treatment improves impact / concentricity significantly; the maximum torque is reduced and the torsion increases. The sag can become larger. The surface is given annealing colours. A protective gas is not generally used here. We clamp one side of the shaft core horizontally to measure the sag. On the other side, the distance is measured by which the free end of the shaft moves down under the force of gravity. The measured length is generally 50 times the diameter....