i tion with the view on side Side is on top M B3SV-25-C Bevel-helical speed reduction gearboxes B3

Flender/Flender Gear Units/Bevel-helical speed reduction gearboxes B3

om appropriately chosen differences intool radii and prole crowning from spherical tool proles. The method is also used to grind gears which have been roughed with the Zyklo-Palloid method. The circular arc of the grinding wheel is then adjusted closely enough to the elongatedepicycloid form for the different tooth traces to produce as little variance as possiblein the grinding allowance. Wiener 1-trace This is also single indexing method for bevel gears with constant tooth depth. Unlike the Wiener 2-trace method, it produces the wheel in two-ankoperation, and the geometry of the individually produced pinion tooth anks isadapted accordingly, .. the tooth slot is more tapered than in the Wiener 2-traceprocess. This method is used for both generating and forming processes in whichthe wheel is plunge cut. Semi-completing This is nishing method used for single ank grinding of bevel gears roughed with the Zyklo-Palloid method. Spiral bevel gears nished in this wayhave constant tooth depth and circular arc tooth trace. Both the pinion and thewheel are generated. feature of this method is that the two anks of the bevel gearare machined with different machine settings but using the same tool. This means that, unlike the Wiener 2-trace method, it allows the actual tool radii required for machin- ing both the concave and convex ank to be accommodated on single grindingwheel. This is achieved by modifying the machine kinematics, either by tilt, helicalmotion or modied roll (see Sect. 3.3.3 ), the latter being the more usual method. As only one tool is required, the rst ank is nished by generating motion in onedirection on the machine, and the second ank by generating in the other direction.The machine settings are modied at the point of reversal. Thus, this method protsfrom the reverse motion which anyway is required to generate the opposite tooth ank, leading to advantages in productivity when compared to the Wiener 2-trace method. Lengthwise crowning is usually gener