For flute grinding of HSS taps, there are single‑thread flute grinding and multi‑thread flute grinding processes. 

We have compiled dressing parameters and flute‑grinding parameters for multi‑thread flute grinding, for reference only by HSS tap manufacturers.

CBN Wheel Dressing Parameters

Equipment: Jiantao SM‑150 Full‑automatic CNC Thread Grinding Machine

Dressing Roller: 1A1 70 Forming Roller

CBN Grinding Wheel: 3A1 350×203×10×10, 280#, C100

Dressing Parameters:

CBN wheel rotational speed: 1200 rpm

Dressing roller rotational speed: 5200 rpm

In‑feed increment: 0.2 μm

In‑feed rate: 0.01 mm per 60 s

Approximate dressing cycle: 2‑3 hours

 CBN Wheel Grinding Parameters

Equipment: Jiantao SM‑150 Full‑automatic CNC Thread Grinding Machine

Spindle Power: 7.5 kW

Wheel Specification: 3A1 350×203×10×10, D64, C100

Cooling Method: Oil cooling

Workpiece: M6×18, 3‑flute spiral‑flute tap; thread pitch 1.0 mm, flute depth 0.63 mm

Workpiece Material: HSS M35 (Heye)

Wheel Speed: 1600 rpm (29 m/s peripheral speed)

Grinding Depth: 0.63 mm completed in one pass

Feed‑rate Setting: 10

Grinding Cycle: 70 seconds per piece

Dressing Frequency: Dressing after every 200 pieces; dressing depth 0.01 mm