update CNC page with switch table

Author: MateoVanDamme

docs/infra/cnc.md

@@ -20,14 +20,30 @@ When operating the machine:
 
 ## Stepper motors
 - Voltage drop: 4.8V
-- Max current: 2.1A
+- Max current per phase (RMS): 2.1A
+
 <img src="./images/cnc_motors_rotated.jpg" alt="CNC X-axis stepper motors" width="400">
 
 ## Stepper motor drivers
 - Model: DM556 
 - Guide: https://kitaez-cnc.com/f/dm556_v30.pdf
+ 
 <img src="./images/driver_DM556.jpg" alt="CNC X-axis stepper motor drivers" width="400">
-There are 8 switches on the stepper motor driver that should be set as follows
+
+There are 8 switches on the stepper motor driver that should be set as follows: 
+
+| SW1 | SW2 | SW3 | SW4 | SW5 | SW6 | SW7 | SW8 |
+|-----|-----|-----|-----|-----|-----|-----|-----|
+| OFF | ON  |  ON | ON  | ON | OFF  | ON  | OFF |
+
+### SW1 -> SW3
+Currently this is set to 2.1A max peak current. Because you have to divide by sqrt(2) to get the RMS value we are  currently under powering the CNC. 
+### SW4
+Current settings is full current.
+This should be set to half current. This means that when the CNC is holding and not moving only half the current is applied. This saves stepper motor life. 
+### SW5-> SW8
+This is currently set to 4000 pulses per revolution. This is conservative. 
+
 # Getting Started Guide  
 
 ## Designing CNC Routines