Changing EEPROM Settings & S Value

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Connecting Your Longmill

You should already be familiar with this process, connect your Longmill to your machine interface.

If you need a refresher for connecting the Longmill with gSender click here: https://resources.sienci.com/view/gs-using-gsender/

Setting Your S Value Max

Setting your S value max correctly will ensure you have access to 100% of your laser’s power.

This value should always match your maximum spindle speed in your GRBL EEPROM settings. S value max = $30 value

Lightburn  

Click on the ‘Device Settings’ Icon

Change ‘S-value max’ to 255

Click OK to save new setting

Setting Maximum Spindle Speed

Setting your maximum spindle speed to match your S value max will ensure you have access to 100% of your laser’s power.

This is how your Longmill determines what percentage of power you have access to: (S value max/maximum spindle speed) x 100 = max percentage of power you can access

Example 1: (255/255) x 100 = 100%

Example 2: (100/1000) x 100 = 10%

Example 3: (1000/1000) x 100 = 100%

We recommend you use the value 255 for both S value max and maximum spindle speed but you can use any value as long as you ensure the value is the same for both S value max and maximum spindle speed

gSender

Click on the ‘Firmware’ button

Scroll down to $30 – Maximum Spindle Speed

Change value to 255

Click on the ‘Apply Settings’ button

You can also change this value in the console manually by typing $30 = 255.

Setting Minimum Spindle Speed

gSender

Click on the ‘Firmware’ button

Scroll down to $31 – Minimum Spindle Speed

Change value to 0

Click on the ‘Apply Settings’ button

You can also change this value in the console manually by typing $31 = 0.

Enable Laser Mode

gSender

Click on the ‘Firmware’ button

Scroll down to $32 – Laser Mode

Click on the ‘Laser mode sliding button’

Click on the ‘Apply Settings’ button

To avoid any issues you can confirm that your Firmware settings are correctly set before running a laser job.