How to calibrate the Focal Distance on a Thunder Aurora 1.0 Pro or Aurora 2.0 Galvo Laser

How to calibrate the Focal Distance on a Thunder Aurora 1.0 Pro or Aurora 2.0 Galvo Laser

Preface: This article covers the use of the Thunder laser auto focus software and some of the basics of setting up the new Lens in EzCad3 or Lightburn. It does not cover the topic of finding the optimum focal distance.

Quick Start Video:

Complete Guide:

Things you need to get started:
Windows PC
TLtool Software (Find on USB stick or KB)
Aurora Manual
Lens and Cor File

1. Gather data on which Lens you are installing

Here is a list of Focal Lens and their nominal focal distances:

2. Make Connections to the TLautoFocus board

Aurora 1.0:

Use this cable:

Connect to this board on the top of the machine:
Access the TL Focus board by removing the 6 bolts holding the top cover of the machine to the frame.

Aurora 2.0 (Estop button on Left)

You are in luck. The cable you use to connect to the machine goes to an internal hub which has the Tl Focus Board connection already made.

3. Check which Com Port you need to use

Open up Windows Device Manager and look for a CH340 device under the Ports (Com & LPT) section

4. Open the Software

Run the software. Depending on if it is on your USB stick or you recently downloaded it from the KB, your file location may differ than what is shown below.

5. Connect and Set Focal Height

1. Change Comm port to what was determined above
2. Click "Connect". At that point it will read the TL Focus Board and the Send button will become active
3. Set Gear Pitch to 5
4. Set Pulse to 5000
5. Set your Focal Distance from the table above based on the lens you are swapping to
6. Click "Send" and get the send success message


6. Change Cor File\Profile in Ezcad or Lightburn

You must select the correct Cor file for your installed lens:


Lightburn Device Settings:

You can go through the process of loading the Cor file each time in Ezcad but your parameter library will not necessarily work the exact same for all the Lens options. Thunder suggest that you create separate copies of the EzCad folders and have each one setup for a different Cor File and Lens. You can have multiple device profiles in Lightburn to accomplish the same thing:


Each folder has separate settings for each Lens, the shortcuts for Ezcad3 are then pointed to the corresponding folder


Why are there different Focus Values in the manual and where should I measure to:

So the distance that you enter for the Autofocus sensor is different than the distance from the lens to the material. The reason is because the Autofocus sensor is mounted in the galvo head, above the lens, so it has an offset to it. The image below should help clarify.

Reference Articles:

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