Cutting conditions

Cutting conditions

First, please enter the specs which you are using, the number of rotation, etc. and calculate the speed of cutting. After that, please compare it with the standards which MRT recommends(please refer to the following chart)

※The speed which MRT recommends are just a standard. It varies from the type of work materials and the performance of the machines. If you would like to know in detail, please contact our technical staffs.

  • mm
  • r.p.m.
 m／min

Please confirm the work material or cutting materials, please try to compare the table below.

■Cutting speed　V(m/mim)

WorkCutting materials
Representative material types High speed steelCarbide
Iron steelCarbon steelSuper soft steelS10C 30～6060～130
Soft steelS30C 40～6080～130
Semi-hard steel S40C 35～5570～110
Hard steel S50C 30～5060～100
Hardest steelSK5 25～4050～80
Free cutting steelLead Free cutting steelAdditional code "L" 45～70100～150
Sulfur Free cutting steelAdditional code
"S" or "SUM"		 50～80110～170
Stainless steelFerritic StainlessSUS430 30～6560～130
Martensitic StainlessSUS420J2 20～5550～120
Austenitic StainlessSUS304 15～5040～110
Special steelHigh manganese steelSCMnH21 5～1515～30
High speed steelSKH51 15～3035～60
Tool steelSK2 20～3060～90
Alloy steelSCM430 35～5070～110
Cast materialsChilled cast iron　 ―5～15
Alloy cast iron　 5～1515～35
Spheroidal graphite cast iron FCD50 15～3535～60
Standard cast iron FC20 20～5045～100
Malleable cast ironFCMB32 20～3040～70
Cast steelSC46 25～40 50～80
Non-ferrous metalsCopper alloyCopperC1100 40～10080～250
BronzeBC2 70～100150～250
BrassC2600 100～250200～350
Light alloySilicon aluminum alloyAC3 25～4050～80
Aluminum alloyA2017 120～200250～400
AluminumA1100S 150～400300～500
Magnesium alloyMP1 200～600400～1200
　TitaniumTR35 10～3020～60
Cobalt and nickel alloy Stellite 　 ―7～15
Hastelloy　X 　 ―10～20
Inconel　X 　 ―15～30
NickelNNCP-0 ―10～25
Non- metals Plastic Thermosetting plastic 　 80～130180～250
Thermoplastic 　 150～220300～450

■Feed per tooth　Sz(mm/tooth)

High speed steel screw slotting cutter0.01mm～0.04mm
Solid carbide metal slitting saw0.005mm～0.02mm
con-img1

D:Outside diameter of sutters(mm)
N:Cutting rotation per minute(r.p.m.)

con-img2

Vf:Feed speed(mm/min)
Z:Number of teeth
N:Cutting rotation per minute(r.p.m.)

Troubleshooting for cutting use

■Deciding the cutting speed

Maintain low speed if....Maintain high speed if....
  • you want to keep same cutter for a long life
  • the material is hard, or it is coated with surfaces resistant to wear
  • the processing is in a primary stage (coarse cutting)
  • the process is new or still unfamiliar for you
  • the wear and the damage of cutting edge are rapid
  • the work is relatively easy or soft to cut
  • the finishing requires detail and accuracy, machined surface require accuracy of roughness at high level
  • the productivity is important

■Choosing the feed per tooth

Decrease the feed if....Increase the feed if....
  • the work can only be set up in an unstable position, or you are handling a thin and irregularly-shaped material
  • the work must be cut by a thin, fragile cutter
  • the machined surface must be high level accuracy of roughness
  • chipping occurs more than minimum feed condition
  • you are cutting out a large groove
  • the work set up firmly, heavy duty cutting
  • the work is relatively easy to cut, or it is hard only on the surface, and the inside is relatively soft
  • the work surface is interrupted shape
  • the flank wear increase rapidly
  • the machinery vibration occurs at cutting process

If you most change the machine set up from the testing stage, please experiment with the cutting speed, feed, depth, independently. Even if the combination proved right during the testing stage, it is advisable to gradually increase the limit to reach the highest efficiency possible. Then, adjust the limit to meet the safety guidelines for the best result. Please strengthen the installing equipment if necessary.