bore — Boring / helical-bore cycleMachining cycles
Bore a hole — straight or helical milled.
bore at (x,y)… depth <d> [dia <D>] [pitch <p>] …Equivalents: Fanuc G85/G86/G89 · Siemens CYCLE85–89
| Parameter | Type | Default | |
|---|---|---|---|
at | mm | — | hole positions |
depth | mm | — | bore depth |
dia | mm | — | bore diameter (helical mill) |
pitch | mm/rev | — | helical descent per revolution |
Bore a hole to size. Straight boring feeds to depth and retracts (`G85`/`G86`/`G89` variants). Give a `dia` larger than the tool and it becomes a **helical interlock** — the cutter descends on a helix to mill out the full diameter, so one end mill bores a range of sizes (no dedicated boring bar). `pitch` sets the helical descent per revolution; `stepover`/`finish` control roughing passes and a finish allowance. Ahead of the basic vendor bore cycles. ``` straight bore helical bore (dia > tool) │ feed ▼ ╲ ╱ ╲ ╱ descends on a helix, │ ╳ ╳ milling the full bore Ø ▼ depth ╱ ╲ ╱ ╲ ```
units mm
tool 1 = endmill(dia=10)
spindle 4000
defaults { feed 400 }
bore at (0,0) depth 10 dia 30 pitch 1.5 stepover 3 finish 0.3