Stator bore of the electric motor housing

1. Spindle tool

Reverse machining of the bearing seat

  • Spindle tool operation in the pulling direction
  • Finished diameter incl. chamfer
  • Machining in one clamping possible
  • Short overhang length for improved rigidity

Technical data
Dimensions: ~Ø 50 mm
Type: PCD indexable inserts
Vc: 500+ m/min
F: 0.07 mm/rev
Ap: 0.5 mm 

2. 3D-printed composite boring bar

Finishing tool (top left)

  • Light-weight construction with aluminium and composite wings (9,8 kg for Ø 200mm)
  • Multi-stage solution
  • Fine presetting for tolerances up to IT6
  • Composite wings permit a modular system

Roughing tool (top right)

  • Light-weight construction with aluminium and composite wings (10,4 kg for Ø 200mm)
  • Multi-stage solution
  • Incl. machining of the bearing seat
  • Composite wings permit a modular system

2. Conventional boring bar

Finishing tool (bottom left)
(incl. bearing seat) 

  • Cost-effective solution
  • Multi-stage solution
  • Fine presetting for tolerances up to IT6
  • Iincl. bearing seat

Roughing tool (bottom right)

  • Cost-effective solution
  • Multi-stage solution
  • Incl. machining of the bearing seat

3. Special U-axis

Finish machining of the stator bore as well as bearing seat and circlip ring groove (top)

  • Industry 4.0 Tooling with the U-axis Technology
  • Z=3 for high linear feedrate
  • Includes the machining of the bearing seat and groove for the retaining circlip
  • Accurate tolerances as well as undercuts on the main diameter

3. U-axis with snap-on tools

Rough and finish machining of the stator bore in one shot(bottom)

  • Roughing and finishing with a single tool
  • Process-secure stator bore machining with accurate repeatability
  • Modular structure (U-Axis, front tools, cartridge, indexable inserts)
  • Process time reduction thanks to multi-purpose roughing and finishing solution

4. Slide tool

Finish machining of the stator bore

  • Mechanically actuated tool on special machining centers
  • Finish machining of the main stator bore, bearing seat and chamfer
  • Undercuts and contour machining are possible
  • High feed rates thanks to Z=4

Cutting data for the tools

3D-printed composite boring bar (2)

Roughing tool (top left)

Cutting diameter (mm) Cutting speed (m/min)
199 500
Speed (rpm)
Tooth number
800 4
Hole depth (mm) Rough bore diameter (mm)
250 195
Feed rate per tooth (mm/tooth) Tool weight (kg)
0.1 10.4
Feed per revolution (mm/rev) Feed rate (mm/min)
0.4 320
Feed force (N) Main time (s)
1045 46.88
Torque (Nm) Drive power (kW)
170 14

Finshing tool (top right)

Cutting diameter (mm) Cutting speed (m/min)
200 500
Speed (rpm)
Tooth number
800 4
Hole depth (mm) Rough bore diameter (mm)
250 199
Feed rate per tooth (mm/tooth) Tool weight (kg)
0.1 9.8
Feed per revolution (mm/rev) Feed rate (mm/min)
0.4 320
Feed force (N) Main time (s)
167 46.88
Torque (Nm) Drive power (kW)
24.2 2.3

Conventional boring bar (2)

Finishing tool (bottom left)

Cutting diameter (mm) Cutting speed (m/min)
221 600
Speed (rpm)
Tooth number
864 8+4
Hole depth (mm) Rough bore diameter (mm)
250 220
Feed rate per tooth (mm/tooth) Tool weight (kg)
0.06 29
Feed per revolution (mm/rev) Feed rate (mm/min)
0.24 207
Feed force (N) Main time (s)
192 72.34
Torque (Nm) Drive power (kW)
21.21 1.92

Roughing tool (bottom right)

Cutting diameter (mm) Cutting speed (m/min)
220 500
Speed (rpm)
Tooth number
723 6+12
Hole depth (mm) Rough bore diameter (mm)
250 215
Feed rate per tooth (mm/tooth) Tool weight (kg)
0.2 25
Feed per revolution (mm/rev) Feed rate (mm/min)
0.24 289
Feed force (N) Main time (s)
2755 51.85
Torque (Nm) Drive power (kW)
237 17.94

Special U-Axis (3)

Cutting diameter (mm) Cutting speed
221 500
Speed (rpm)
Tooth number
720 3
Hole depth (mm) Roughing bore diameter (mm)
250 220
Feed rate per tooth (mm/tooth) Feed per revolution (mm/rev)
0.15 0.45
Feed rate (mm/min) Feed force (N)
324 183
Main time (s) Torque (Nm)
46.3 20
Drive power (kW)  
1.52  

Actuating tool (4)

Cutting diameter (mm) Cutting speed
170 500
Speed (rpm)
Tooth number
936 4
Hole depth (mm) Rough bore diameter (mm)
250 169
Feed rate per tooth (mm/tooth) Tool weight (kg)
0.08 22
Feed per revolution (mm/rev) Feed rate (mm/min)
0.32 299
Feed force (N) Main time (s)
141.8 50
Torque (Nm) Drive power (kW)
12.03 1.18