TECHNICAL DATA THREADING METHODS THREADING DEPTH Features Advantages Disadvantages · Easy to use. · Long chips generated during the V1 (Standard program for threading.) final pass. · Superior resistance to vibration. · Complex calculation of cutting (Constant cutting force.) depth when changing the number of passes. Fixed cut area · Reduced load on nose radius · Subject to vibration in the later during the first half of the passes. stages of cutting. X1 · Easy chip control. (Increased cutting force) (Optional setting of chip thickness) · In some cases, changing the NC X2 · Easy to calculate cutting depthwhen changing the number ofprogram is necessary. passes. Fixed cutting depth · Good chip control. * It is recommended to set the depth of cut of the final pass to 0.05 mm 0.025 mm. Large cutting depths can cause vibration, leading to a poor surface finish. y Formulas aFormulas to calculate infeed for each pass in a reduced series. Example) External threading (ISO metric) Pitch : 1.0 mm ap : 0.6 mm nap :5 : Depth of cut : Actual pass 1st pass : Total depth of cut : Number of passes 2nd pass : 1st pass 0.3 2nd pass 2–1=1 3rd pass 3rd pass 3–1=2 · 4th pass · nth pass 5th pass y NC Program for Modified Flank Infeed aExample:- M12×1.0 5 passes modified 1°-3° (mm) External Threading Internal Treading P P018 TECHNICAL DATA