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Technical Inquiry
Application · Tool industry

Tool Grinding

Drills, end mills and micro rotary tools take their shape from grinding: flute, land, point and shank are produced by the wheel alone. Small tool diameters, high cutting speeds and slender cross-sections leave little room – form accuracy, sharp cutting edges and a reproducible surface are what count.

Polyimide & hybridD46 – D151Flute · Profile · Cylindrical
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Select the surface you want to grind

Click a surface of the drill to see the machining process and the matching EHWA tool solution.

Two-flute drill with selectable grinding surfaces: flute, margin, back taper, shank, primary flank and web thinning
Material
Solid carbide, HSS, PM and high-alloy tool steels
Surface Ra/Rz
Ra 0,4 – 0,6 µm
Machine
CNC tool grinding machine
Coolant
Wet grinding
Material
Solid carbide, HSS, PM and high-alloy tool steels
Surface Ra/Rz
As specified on the drawing
Machine
CNC tool grinding machine
Coolant
Wet grinding
Material
Solid carbide, HSS, PM and high-alloy tool steels
Surface Ra/Rz
Back taper 20 – 60 µm over the fluted length
Machine
CNC tool grinding machine
Coolant
Wet grinding
Material
Solid carbide, HSS, PM and high-alloy tool steels
Surface Ra/Rz
As specified on the drawing
Machine
CNC cylindrical grinding machine
Coolant
Wet grinding
Material
Solid carbide, HSS, PM and high-alloy tool steels
Surface Ra/Rz
As specified on the drawing
Machine
CNC tool grinding machine
Coolant
Wet grinding
Material
Solid carbide, HSS, PM and high-alloy tool steels
Surface Ra/Rz
As specified on the drawing
Machine
CNC tool grinding machine
Coolant
Wet grinding

Flute

Helical flute along the fluted length

Standard grinding wheel shape 1V1

The flute carries the chips out of the hole and its profile sets the rake angle at the cutting edge. It is ground with a profiled wheel – flute form and flute root are produced in a single pass.

Recommended solution

Flute grinding

Tool type
Flute and profile grinding wheel
Shape
1V1 profiled
Abrasive
Diamond (carbide, cermet), CBN (HSS, PM steels)
Grit size
D46 – D151 · B46 – B151
Request a design
Technical details
Process
Flute grinding
Bond
Phenolic (PF), polyimide (PI / HT-PI), hybrid (HB)
Grit size
D46 – D151 · B46 – B151
Dimensions
Ø 75 – 400 mm
Design
Matched to common tool grinding machines, material and coolant situation; profile and flute geometries customer-specific

Margin

Narrow land at the outside diameter, along the flute

Standard grinding wheel shape 1A1

The margin guides the drill in the hole. In margin grinding only this narrow land is left at full diameter while the rest of the land is relieved – which limits friction and heat input.

Recommended solution

Margin grinding

Tool type
Profile grinding wheel
Shape
1A1 narrow
Abrasive
Diamond (carbide, cermet), CBN (HSS, PM steels)
Grit size
D46 – D151 · B46 – B151
Request a design
Technical details
Process
Margin grinding
Bond
Phenolic (PF), polyimide (PI / HT-PI), hybrid (HB)
Grit size
D46 – D151 · B46 – B151
Dimensions
Ø 75 – 400 mm
Design
Matched to common tool grinding machines, material and coolant situation; profile and flute geometries customer-specific

Back taper

Outside diameter over the fluted length

Standard grinding wheel shape 1A1

The fluted section runs slightly conical towards the shank. The back taper is produced when grinding the outside diameter and keeps the drill clear behind the cutting edge so that it does not bind in deep holes.

Recommended solution

Profile grinding

Tool type
Cylindrical and profile grinding wheel
Shape
1A1 profiled
Abrasive
Diamond (carbide, cermet), CBN (HSS, PM steels)
Grit size
D46 – D151 · B46 – B151
Request a design
Technical details
Process
Profile grinding
Bond
Phenolic (PF), polyimide (PI / HT-PI), hybrid (HB)
Grit size
D46 – D151 · B46 – B151
Dimensions
Ø 75 – 400 mm
Design
Matched to common tool grinding machines, material and coolant situation; profile and flute geometries customer-specific

Shank

Cylindrical clamping section behind the flute run-out

Standard grinding wheel shape 1A1

The shank takes the clamping force in the holder and determines the run-out of the tool. It is ground to size, roundness and surface quality – and the tool is located from it for the remaining grinding steps.

Recommended solution

Cylindrical grinding

Tool type
Cylindrical grinding wheel
Shape
1A1
Abrasive
Diamond (carbide, cermet), CBN (HSS, PM steels)
Grit size
D46 – D151 · B46 – B151
Request a design
Technical details
Process
Cylindrical grinding
Bond
Phenolic (PF), polyimide (PI / HT-PI), hybrid (HB)
Grit size
D46 – D151 · B46 – B151
Dimensions
Ø 75 – 400 mm
Design
Matched to common tool grinding machines, material and coolant situation; profile and flute geometries customer-specific

Primary flank

Conical face behind the main cutting edge

Standard grinding wheel shape 11V9

Behind the main cutting edge the flank falls away so that only the cutting edge is in contact. The standard point angle is 118°; clearance angle and point geometry come from the relative motion of wheel and workpiece.

Recommended solution

Profile grinding

Tool type
Cup and profile grinding wheel
Shape
11V9 cup wheel
Abrasive
Diamond (carbide, cermet), CBN (HSS, PM steels)
Grit size
D46 – D151 · B46 – B151
Request a design
Technical details
Process
Profile grinding
Bond
Phenolic (PF), polyimide (PI / HT-PI), hybrid (HB)
Grit size
D46 – D151 · B46 – B151
Dimensions
Ø 75 – 400 mm
Design
Matched to common tool grinding machines, material and coolant situation; profile and flute geometries customer-specific

Web thinning

Web area at the chisel edge

Standard grinding wheel shape 12V9

The chisel edge does not cut, it pushes. Web thinning takes the core back at the point and shortens the chisel edge – the drill centres better and needs less thrust force.

Recommended solution

Web thinning

Tool type
Profile grinding wheel
Shape
12V9 thinning grind
Abrasive
Diamond (carbide, cermet), CBN (HSS, PM steels)
Grit size
D46 – D151 · B46 – B151
Request a design
Technical details
Process
Web thinning
Bond
Phenolic (PF), polyimide (PI / HT-PI), hybrid (HB)
Grit size
D46 – D151 · B46 – B151
Dimensions
Ø 75 – 400 mm
Design
Matched to common tool grinding machines, material and coolant situation; profile and flute geometries customer-specific
More surfaces

Process

For this EHWA supplies CBN and diamond grinding wheels with matched polyimide and hybrid bonds. They keep the free-cutting behaviour defined and the process stable.

Thermal stability, controlled porosity and adapted grit retention work together here: low grinding forces, edge quality that holds over the tool life, and results that repeat in series and high-volume production.

What the process gains

Longer dressing intervals

Stable profile geometry and higher net running time per shift

Consistent flute and surface quality

Reproducible cutting edge quality over the entire tool life

Reduced thermal load

Lower risk of grinding burn and dimensional deviation at high feed rates

Recommended tools

Product types Cylindrical, profile and flute grinding wheels
Abrasives Diamond (carbide, cermet), CBN (HSS, PM steels, high-alloy tool steels)
Bonds Phenolic (PF), polyimide (PI / HT-PI), hybrid (HB)
Grit sizes D46 – D151 · B46 – B151
Dimensions Ø 75 – 400 mm

Process example

Hybrid bond | Diamond D76

Flute grinding of solid carbide end mills (Ø 8 mm, 4 flutes) in series production

Goal: Increase tool life with consistent flute geometry and reduced thermal load

up to 25 %
More tools per dressing cycle
Material Solid carbide, K30 – K40
Process Deep flute grinding (full cut), wet grinding
Tool length 60 mm
Grinding wheel diameter 150 mm (profile wheel)
Peripheral speed 45 – 55 m/s
Feed rate 80 – 120 mm/min
Infeed 2.0 – 2.5 mm radial (over several strokes)
Dressing interval 120 – 150 tools

Result

  • Longer dressing intervals, higher machine availability
  • Consistent flute width (±0.01 mm), reproducible tool performance
  • Reduced grinding forces, lower thermal influence on the surface zone
  • Stable surface quality (Ra 0.4 – 0.6 µm) over the entire tool life

Figures from an approved customer process. Tools are always engineered around the machine, workpiece, and process of the individual case – these figures are evidence, not a guarantee.