Threading

Partial Profi le Full Profi le Multi-Tooth Profi le

Tooth profi le with universal Tooth profi le with full profi le shape Multi-tooth full profi le
profi le shape:including tooth height:generally with 2–3 teeth:
  • 55° or 60° without cutting edges
  • For bur-free, precise threads in the specifi ed
  • 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 to fi nd given

D (mm) m/min RPM

D (mm) RPM m/min

m/min =

RPM =

Legend

formula m/min = metres per minute

/ x D RPM = revolutions per minute

x RPM D = part diameter 1000 / = 3.1416 m/min x 1000

D x /

Maximum Cutting Speeds Flank clearance

a = arctan (sin`/2) * tan(_)) On older machines, cutting speed is often limited by the maximum a = side (fl ank) 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) =

ThreadAngleExternalInternal
part diameter (mm) x 3.14 x (1/pitch) x max mm/min
1000mmUN & ISO605.38
BSW554.87.3
TR302.64
ACME292.63.9
AMBUT7.6.9
AMBUT4546

LWID_Master16_Turning_Threading_F086_F087_Metric_REBRAND.indd 86ViWID M16 TiThdiF086 F087 M i REBRAND N b 11 2015 8 24 AM 11/11/15 9:29 AM