DCG - Horn Magyarország Kft.

TECHNICAL INSTRUCTIONSFeed rates and time calculationIt is simple and easy to calculate your speed and feedsusing HORN'S HCT programme. We recommend thatyou calculate the cutting data with this programme asit will provide you with the best cutting performance andresults. Basic features of the calculations can be foundon the follwing pages.HCT(HORN Circular Technology)- safe and fast -Your cutting data for groove milling by circularinterpolation of internal and external groovesas well as groove milling of linear grooves.System requirements from Windows 95.Available on CD-ROM.BASIC RECOMMENDATIONSOverhang of the milling cutterSelect the shortest possible clamping device and millingshank, and control the runout tolerance of the tools.Large cutting widths in combination with long overhangsrequire specific manufacturing methods such as dividingthe cutting width to achieve the best possible cuttingresult due to reduced cutting forces.Diameter of the milling cutterWhen using a large diameter cutter, whose relationshipis close to the bore diameter, manufacturing cycletimecan be reduced, due to the smaller center of rotation andhigher feed rates. Many times the rotation of the millingcutter center will be defined by the parameters of theworkpiece and the whole application setup.Thread millingWith HORN thread milling inserts the thread profile isgenerated in one full cut to the profile depth of the thread.This produces threads with minimal taper especially inhigh alloyed steels.In blind holes it is recommended to mill from the bottomto the top. Otherwise there is the risk of damaging thetool because of milling into chips at the bottom of theblind hole.A general recommendation for thread milling:The milling cutter diameter should not exceed 70% of theminor diameter of the thread. Otherwise recutting of theprofile occurs which could bring the whole thread out oftolerance.15