This guide shows you how to use the Control Point Target together with the Blue Ring Reflector to position the reflector precisely on a surveyed control point (CP) before recording it for stationing. Use it every time you record a floor control point with the FieldPrinter.

Why This Matters

The FieldPrinter does not guess or stretch the layout to fit the slab. The laser tracker locks onto the reflector and uses the recorded control points to best-fit your digital layout file to the real-world jobsite. The position the tracker records is the position of the reflector — not the mark on the floor.

If the reflector sits even slightly off the control point, the tracker records the wrong coordinate, which shows up as high error and difference (delta) values during stationing and can shift your entire layout. The Control Point Target exists to remove that guesswork: it centers the reflector on the control point the same way every time.

What You'll Need

• Control Point Target — the ring fixture with crosshair spokes and a center hole that seats the reflector
• Blue Ring Reflector
• A surveyed control point marked on the slab (typically a crisp "X" or crosshair, labeled to match your control list)

Steps

1. Walk to the control point

Carry the Control Point Target and the Blue Ring Reflector to the first CP you want to record.

2. Align the target over the control point mark

Set the target on the slab and line up its center crosshair / center hole directly over the marked control point. Take the time to get this right — the center hole only guarantees accuracy if the target itself is centered on the mark.

Tip: Use the crosshair spokes against the slab's "X" or crossing reference lines to confirm the target is centered before you seat the reflector.

3. Seat the Blue Ring Reflector in the center hole

Place the Blue Ring Reflector into the target's center hole. The center hole holds the reflector directly over the control point so it sits precisely on the point.

4. Record the control point

With the reflector seated and the tracker locked on, record the point in the Dusty App from the Setup tab. Watch the error and difference values as you record — if a point reads much higher than the others, re-seat the reflector, confirm the target is still centered, and re-scan.

5. Move to the next control point

Lift the target and reflector and repeat for each remaining control point. Spread your recorded points across the full work area for the most stable stationing.

Verify It Worked

• The reflector is seated flat in the center hole, with no wobble.
• The target's crosshair is still centered on the slab mark.
• The recorded point's error and difference values are in line with your other points. Consistently high values usually mean the reflector wasn't centered, the mark is damaged, or the point was mis-surveyed.

Common Issues