3-AXIS CNC ROUTING & MACHINING CAM

CNC Router & Mill Helical Thread Milling Calculator

Compute helical pitch feed per revolution, internal/external toolpath centerline feed compensation, tangential 90° roll-in arc radii, and radial stepover passes for Metric, UNC, and NPT threads.

1. Thread Specification & Type

Thread Standard & Preset

Nominal Thread Major Diameter (D) [mm]

Thread Pitch (P) [mm]

Thread Feature Geometry

2. Thread Mill Cutter & Machining Feeds

Thread Mill Cutter Diameter (Dc) [mm]

Spindle Speed [RPM]

Linear Peripheral Tool Feed Rate (Ftool) [mm/min]

Helical Interpolation CAM Output

Centerline Feed (Fcenter)

240 mm/min

Programmed G-code feed

Roll-In Arc Radius (Rroll)

2.00 mm

Smooth tangent 90° entry

Helical Z-Drop / Rev

2.50 mm

Z-axis pitch per 360° circle

Recommended Radial Passes

2 Passes

Prevents cutter deflection

G02 / G03 Helical Motion Sample:

                            G03 X0 Y4.000 Z-2.500 I0 J-4.000 F240
                        

Precision Helical CAM Vector Paths

SpotItLive generates tangent entry/exit circular arc DXFs and 3D toolpath coordinates for Mach4, LinuxCNC, GRBL, and Fanuc controllers.

Order CNC Vector Pack (29 DKK)