Page 631 - Yamawa_European_Catalogue_YEU23

6. Recommended Tapping Speed

Intro

Tapping Speed
The following machining conditions affect tapping speed: kind of taps, workpieces, number of chamfered threads, materials, hole conditionand SP
lubricant. It is necessary to select the suitable tapping speed by paying attention to these conditions. When work material has excellent
workability, when there is a little depth of tapping, or when tapping lubricant can be sufficient, select rather higher tapping speed. When
workability of work material is unknown, to be safe, try nearly the lowest tapping speed at first, and then increase the speed gradually. Following
speed is basically for the cutting condition under the use of cutting oil. In case of water soluble cutting oil, please reduce the speed by 30%.
SL

Tapping Speed - Vc(m/min)
Workpiece Materials
PO
Spiral Fluted Spiral Pointed Roll Taps Straight Fluted Cemented Carbide
Low Carbon Steels St44, C10~C25 8~15 10~20 8~15 6~10 -
Medium Carbon Steels C25~C45 6~12 8~14 7~12 5~9 -
High Carbon Steels C45~C58 5~10 8~12 5~10 5~8 -
Alloy Steels CrMo~NiCrMo 5~10 7~10 5~10 5~8 - ST
Thermal refined steels 20~45HRC 3~5 4~7 - 3~6 -
Stainless Steels AISI 3~8 4~9 6~15 3~7 -
Tool Steels 1.2311, 1.2344 5~8 6~10 - 5~9 -
Cast Steels SC 6~10 8~13 - 6~10 - ROLL
Cast Irons GG - - - 12~17 15~25
Ductile Cast Irons GGG 5~10 5~10 - 5~8 12~20
Coppers Cu 8~12 8~13 25~35 7~11 15~33
Brass · Brass Casting Bs · BsC 11~22 13~25 25~35 10~20 23~33
CARBIDE
Phosphor Bronze ·
PB · PBC 8~15 10~18 25~35 8~15 18~33
Phosphor Bronze Casting
Wrought Aluminum Al 15~25 20~25 25~35 15~20 23~40
Aluminum Alloy Castings AlSi 11~22 12~24 15~25 10~20 15~25
LONG
Magnesium Alloy Castings MC 7~15 10~20 - 7~15 12~20
Zinc Alloy Diecastings ZDC 7~15 10~20 15~25 7~15 12~20
Thermosetting Plastic Bakelite (phenol-PF) 11~17 12~18 - 10~15 15~25
Thermoplastic resin PVC, Nylon 11~17 12~18 - 10~15 15~25
HAND
Titanium Alloys Ti-6Al-AV etc 6~9 6~8 - - -
TAPS
Nickel Base Alloys Hastelloy, Inconel, Waspaloy 3~6 3~6 - - -

EG (STI)
Formula

Tapping Speed (Vc) Revolution per minute (n)
SPECIAL
THREADS,
GAUGES

-1
n : Revolutions per minute (min ) Vc : Tapping Speed (m/min) THREAD
π : 3.14 Dc : Nominal diameter of tap (mm)
Dc : Nominal diameter of tap (mm) π : 3.14 MILLS

DIES

CENTER
DRILLS

Technical
info

629