ajandClaude Opus 5.5
d3cb23f117
The cut simulation treated Display-layer contour moves (what cutting strategies emit) as head-up travel, so plates with assigned lead-ins were timed as rapids. They now cut, matching the verifier and posts, and suppressed moves are left out. Cut time now follows the CI Fiber post: closed clockwise contours and cut-offs take an outside feed, other contours a hole feed, and etch-only contours can be skipped like its SkipScribe default. The settings are shared by Calculate Cut Time and the simulator, and plate/nest times now always come from the simulation. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
3.1 KiB
Cut-time estimates
Calculate Cut Time and Plate > Simulate Cutting share one timing model
(OpenNest.Core/CNC/CutSimulation.cs, ContourTiming.cs, MotionPlanner.cs), and the
last-used settings are shared through SavedCutParameters.
Inputs
- Outside feed, hole feed, rapid and pierce from the dialog or simulator. Inch rates are per
minute; millimeter rates are per second (the existing
Timing.CalculateTimeconvention). - Skip etch-only contours (on by default) leaves out contours that only scribe, as the
CI Fiber post's
SkipScribedoes, and joins the travel around them. - Acceleration from a machine in Tools > Machine Configuration (
MachineConfig.Motion, in the machine's units and converted to the nest's). The choice is remembered in theCutTimeMachineuser setting. Until any machine is chosen, the first machine is used. "None (full speed)" gives the old constant-speed estimate. - A machine with no saved motion values uses
MotionConfig.Placeholder: about 0.5 G cutting, 1 G travel and a 0.001 in (0.025 mm) corner deviation. These are stand-ins, not measured values, and the picker labels such machines "(placeholder)".
Model
- Moves are walked in plate cutting order. Cut, Display, lead-in/out and Break moves cut; cutting strategies emit contour moves on Display, and the posts cut them. Rapids and Tab spans are head-up travel, and suppressed moves are left out. A cut that follows travel gets a pierce dwell. Scribes are not pierced.
- Contours follow the CI Fiber post's interior/exterior (
L2/L4) rule: a cut-off, or a closed contour wound clockwise (sampled without its lead moves), takes the outside feed. Everything else, including open pieces, takes the hole feed. The CI Fiber post writes no feeds, so these are stand-ins for the controller's process tables until calibrated. - Each cutting run (between a pierce and the next travel) starts and ends at rest. Travel moves are planned separately and also go from rest to rest.
- Each move follows a trapezoidal profile: it accelerates, cruises at the feed and decelerates. A move too short to reach the feed peaks where the two ramps meet.
- Corner speed uses the junction-deviation formula
v² = a·δ·sin(θ/2) / (1 − sin(θ/2)). A zero deviation stops at every corner. Collinear joints do not slow. - Arcs are capped at the centripetal limit
√(a·r), using the cut acceleration. - A backward pass and then a forward pass keep every speed change within the acceleration (Grbl-style lookahead).
Not modeled: jerk (S-curves), controller-specific lookahead limits, feeds from controller process tables beyond the outside/hole split, an etch feed (etch kept in the timing runs at the outside feed), and power ramping. With real controller values, expect roughly 5–15% error. Calibrate by comparing a known program against the machine's own run time.
The plate time is the simulation total plus clamp-removal minutes, times the plate quantity.
Distances and counts in the timing dialog still come from Timing.GetTimingInfo, which counts
only Cut-layer moves as cut distance.