Shuttle Architecture: One Servo Axis, Dozens of Lasers

The problem to solve

If twenty laser reference lines have to be visible at the same time on a line, the obvious answer is twenty moving lasers — each with its own servo motor, drive, encoder and moving cable. Cost then rises linearly as the system grows, and cable complexity and maintenance load rise faster still.

The shuttle architecture breaks that relationship: the number of lasers grows, the number of moving axes does not.

Three rails, three jobs

• Upper rail — power. Carries the electrical supply to the carriages. Power remains connected while the carriages change position along the rail.
• Middle rail — laser carriages. Each carriage carries a single laser module. When a carriage reaches its position it is mechanically locked on the rail and stays there independently of the shuttle.
• Lower rail — the servo shuttle. The only moving axis in the system. It takes each carriage in turn to its recipe position, then retracts to its home position.

The setup cycle

1. RecipeThe operator enters the cutting dimensions on the panel; the system calculates each laser’s target position.
2. ApproachThe shuttle moves along the lower rail to sit beneath the next laser carriage. It is unloaded at this stage.
3. TransportIt carries the carriage to its recipe position. The laser stays on during the move, so the reference line can be watched as it travels.
4. ReleaseThe carriage locks in position and becomes independent of the shuttle.
5. CompletionThe shuttle moves on to the next carriage. Once every reference line is set, it retracts to its home position.

The critical point is the fifth step: once the shuttle retracts, the reference lines stay where they are. Every laser reference line stays on throughout production, and none of them moves.

Why the speed profile splits in two

Unloaded, the shuttle approaches at up to 800 mm/s, and loaded with a carriage at up to 500 mm/s. The split is deliberate: a soft stop at the target position under load is part of holding the accuracy. Unloaded, braking distance is not a concern, so the shuttle travels faster.

Setup time follows from those two speeds, so it grows with the number of lasers — but not linearly : the shuttle reuses part of the distance it has already covered for each carriage.

What is the reserve area?

The rail assembly can hold more lasers than the current recipe requires. Carriages that fall outside the travel range wait parked in the reserve area . When a recipe calls for more reference lines, they come into use without new hardware.

So size the rail assembly not on today’s recipe but on the densest recipe you can foresee . Carriages can be added later; the rail assembly length is fixed.

How is rail assembly length derived?

Rail assembly length is the sum of three components:

Run this calculation for your own line with the live configurator on the product page : enter the travel, the number of lasers on the rail assembly and the spacing between reference lines, and the active/reserve split and the required rail assembly length appear immediately.

When a shuttle fits, and when it does not

The shuttle architecture was designed for lines that need multiple simultaneous projections . If your line has up to six laser reference lines and they do not all have to be visible at once, a shuttle is not needed — Core Precisor delivers the same control infrastructure with fewer components.