Timing & Initiation Designer · Sequence

The pattern

Plan geometry only. Burden is measured perpendicular to the face, spacing along it.

Rows count Row 1 is the row against the free face.

Holes per row count

Burden m

Spacing m

Pattern Staggered offsets alternate rows by half a spacing.

Face bearing ° grid The direction the free face looks — the direction the shot is meant to move.

Charge per hole kg Used for the delay-window charge sum. An imported charge column overrides it.

Hole diameter mm Recorded on the schedule; it does not enter the timing arithmetic.

Initiation scheme

Nominal detonator times, built from the scheme and assigned hole by hole.

Initiation point

Inter-hole delay ms Between adjacent holes along a row.

Inter-row delay ms Between the first hole of one row and the first of the next.

Row progression ms per row Added to the inter-row delay once per row, so the rows open up (or tighten) as the shot works back.

Downline delay ms In-hole delay. It shifts every hole equally, so it changes no relief — but it carries the scatter that dominates a pyrotechnic shot.

Plan view and sweep

Grid north up. Press Play and the detonation front crosses the pattern in real proportion.

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Contours

Isochrons Movement arrows Relief raster Hole numbers Free face

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Burden relief

R = |∇t| in milliseconds per metre. Every published timing rule is written in this unit.

Charge per delay window

The safety-critical output. Vibration follows the largest mass detonating together, not the shot total.

Delay window ms Charges closer together than this are conventionally summed. 8 ms is the common convention; some regulators use 9 ms.

Nearest receptor m Used only to report the scaled distance this charge produces. Predicting a vibration level needs a site law — that is Celtic Charge Tremor.

Detonator scatter

Nominal times are a fiction. This is the shot as the detonators will actually fire it.

Detonator type

Electronic σ ms

Pyrotechnic scatter % of nominal

Custom σ ms

Realisations count

not run

What this timing does

no pattern

Set a pattern and an initiation scheme, or press Demo pattern.

The timing field is interpolated from the hole times by Delaunay triangulation with linear weights, so every value between holes is a blend of three real detonator times — nothing is invented.

Relief is what timing is actually for. The gradient of that field, in milliseconds per metre, is how long the burden in front of each hole is given to move before the hole behind it fires.

Per-hole schedule

Maximum instantaneous charge

Set a pattern and an initiation scheme, or press Demo pattern. Every hole is then binned into delay windows of the width set below the plan.

What comes out is the maximum instantaneous charge — the largest mass detonating inside any one window, which is the charge ground vibration follows, and the number Celtic Charge Tremor predicts from.

It is not the total on the shot. Which holes land in one window, and how much charge that puts together, is the whole reason delays exist.

Windows carrying more than one hole

Firing as designed?

not run

Run the Monte Carlo. Every detonator carries scatter about its nominal time, and the tool re-fires the shot a few hundred times to find out what that scatter does.

Two things come out of it that a nominal design sheet cannot show: how often adjacent holes fire out of designed order, and how much larger the real maximum instantaneous charge is than the designed one.

With pyrotechnic detonators both are usually large.

Pairs most likely to reverse

What this does and does not do

The engine

timing.js