Milling Tools Cutter geometry and applications Cutting conditions Y Radial rake angle Yp Axial rake angle Y0 True rake angle Cutting speed Vc Cutting speed

Milling Tools Cutter geometry and applications Cutting conditions Y Radial rake angle Yp Axial rake angle Y0 True rake angle Cutting speed Vc Cutting speed

Milling Tools Cutter geometry and applications Cutting conditions Y Radial rake angle Yp Axial rake angle Y0 True rake angle Cutting speed Vc Cutting speed (m/min) D Effective diameter (mm) n Number of revolutions (rpm) n 3.14 Number of revolutions (Calculated from cutting speed) Feed speed and feed rate Feed speed is relative speed of cutter and work material and in the normal milling machine it is the table speed. In milling the feed per tooth is very important. The recommended cutting condition is expressed by Vc and ft and using the above equation calculate n and Vf and input in the machine. Vf Table feed (mm/min) ft Feed rate per tooth (mm t) t No. of teeth of the cutter n Number of revolutions (rpm) Cutting depth Determine by required allowance for machining and capacity of the machine. In case of TAC mill there are cutting limits according to shape and size of the insert. Cutting width and engage angle There is an appropriate engage angle depending on the cutter diameter cutting position work material etc. and ordinarily the values in the table below are used as a guide. Work material Appropriate E Cutter dia. and ae Steel 0 20 (on small side for shoulder cutting) ae 2 3D Cast iron under 40 ae 4 5D D Cutter diameter (mm) E Engage angle () ae Cutting width (mm) Technical Data Work material Rake angle combination and applicability Negative-Negative Negative-Positive Positive-Positive Negative true rake angle Negative true rake angle Positive true rake angle Positive true rake angle Cast irons Ductile cast irons Low to medium carbon steels A Special steels ( 400 HB) Stainless steels x A Heat resisting steels x A Tool steels A A Aluminium alloys x x Copper and its alloys x A Titanium and its alloys x A Type Rake angle Features Typical examples of TAC mills Yf Yp Y0 Negative type (Negative-Negative) - Usable cutting edges are doubled and economical TGN4200-A Negative-positive type - Excellent chip removal TME4400I TAD12 - - Higher cutting edge strength TPN6400I (not shown in this catalogue) Positive type (Positive-positive) Freer cutting action TMD4100I Excellent Good A Fair x Not recommended