Soft Start

By Thulani Sithole, MD

Soft Start deals with the first thirty minutes of a cutting shift, when spindles warm, vacuum hold-down is proven, and the first sheet is checked before production speed is used. The note focuses on start-up order so registration drift, loose tooling, and poor extraction do not spoil the opening batch.

Cold starts are hard on both machines and material. A spindle pushed too early, a vacuum line not checked, or a first sheet loaded without a test cut can turn the opening hour into scrap. Soft Start covers the measured first steps that help a cutting day begin properly.

Morning start-up needs more than the green light on the control. On routers, oscillating knives, and mixed cutting cells, we look at spindle run-up, spoilboard suction, tool seating, and a short test pattern on the day’s stock.

First-run checks at the cell

• Main isolator, air, extraction confirmed
• Vacuum zones tested with an offcut
• Tool number matches the loaded program
• Operator name and shift start recorded

Soft Start sits between the machine specification and the day’s first production file. The journal note explains the sequence, while the equipment pages carry the cutter, holder, and table details that affect the opening cut. Used together, they help the shop start with the right tool, the right material face, and the right offsets.

Opening sequence for live production

Soft Start sets out a measured way to bring a cutting cell online at the start of a run. Alignment, checks and first cuts should be done in sequence so early mistakes do not carry through the whole batch.

Begin with the stock pack, not the screen. Board thickness, protective film, warp, and sheet temperature all change how the first cut behaves, especially after a cold night inland or damp coastal storage. South African shifts also work around load-shedding, so restart checks matter when a machine has stood with dust settling on rails and sensors.

Keep one marked first-off part near the cell. That sample gives setters and buyers a fixed reference for edge quality, cut depth, hole size, and face condition before the rest of the batch moves to assembly or dispatch. A short care note beside the HMI often prevents guesswork on the next start-up.

Conditions that change start-up behaviour

A machine in Crown Mines does not wake up like one near the coast. Inland dust can foul linear guides and photo-eyes overnight, while Durban humidity can affect sheet flatness, labels, and vacuum grip on porous board. Soft Start treats existing production cells as they are, with wear, workarounds, and known habits, not as fresh installations.

Power interruptions can leave an unfinished tool change, a shifted datum, or a spindle that never reached stable speed. Grit in extraction hoses changes chip clearing, and poor chip clearing changes edge heat on plastics, composites, and coated board. The opening test cut is there to catch those small changes before they become a full trolley of scrap.

Operated by Astros Marketing (Pty) Ltd from 2 Makro Place, Sunnyrock 1401.