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
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
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
gSender Version 1.04 Bug
We have found a bug in gSender v1.04 that may automatically set your maximum spindle speed setting ($30) to 1 and your minimum spindle speed setting ($31) to 100. Please manually change your settings to the recommended $30=255 (or whatever s value max is set to in lightburn or any other laser code generating software) and $31 = 0.
If you do not use a PWM spindle with your Longmill, leave gSender in Laser mode enabled and do not switch back or these settings may be changed automatically.
To avoid any issues you can confirm that your Firmware settings are correctly set before running a laser job.