Technical Information Threading Partial Profile Full Profile Multi-Tooth Profile Tooth profile with universal Tooth profile with full profile shape Multi-tooth full profile profile shape: including tooth height: generally with 2–3 teeth: • 55° or 60° without cutting edges • For bur-free, precise threads in the specified • Highly productive threading with for the tooth tapers. pitch. fewer passes and longer tool life. • Reduced inventory. • General application. • Requires a rigid setup and long thread • For various pitches in a limited range. • Machining allowance for outside/core diameter pass through. • Preferably one time production. around 0,1–0,15mm. • Minimum clearance width approximately 1.25 x E as per indexable insert • Major/minor diameters must be dimensions table. accurately pre-turned. Formulas Metric Formula Legend to find given formula m/min = metres per minute m/min D (mm)RPM /xD RPM = revolutions per minutem/min =x RPMD=part diameter1000/=3.1416 RPM D (mm) m/min x 1000m/minRPM =Dx/ Maximum Cutting Speeds Flank clearance a = arctan (sin`/2) * tan(_)) On older machines, cutting speed is often limited by the maximum a = side (flank) clearance travel speed mm/min of the tool allowed by the machine. ` = included angle of thread form Check your maximum speed with the following formulas: _ = radial inclination angle metric formula: maximum cutting speed (m/min) =part diameter (mm) x 3.14 x (1/pitch) x max mm/minThread Angle External Internal 1000mm UN & ISO 60 5.3 8 BSW 55 4.8 7.3 TR 30 2.6 4 ACME 29 2.6 3.9 AMBUT 7 .6 .9 AMBUT 45 4 6 F86 widia.com