#include <Arduino.h>
#include <AccelStepper.h>
AccelStepper stepper(1, 9, 8); // mode 1 = half-step, etc... 200 steps/revolution
                               // pin 9 = PUL 8 = DIR

void setup() {
  stepper.setMaxSpeed(4000);
  stepper.setAcceleration(2500);
}

void loop() {
// screw pitch = 2.5mm/rev, motor = 200 steps/rev + 1/2 step mode = 400 steps/rev
// 30mm travel = 12 revs / 200 * 2 * 12 = 4800 steps

   // slow speed drilling 
   stepper.moveTo(-4800); // position +30mm drilling 1/3 
   stepper.runToPosition(); 
   delay(250);            

   // fast speed movement 
   stepper.moveTo(0); // position 0mm / chip removal
   stepper.runToPosition();
   delay(250);

   // fast speed movement 
   stepper.moveTo(-4800); // fast advance to +30mm for drilling 2/3
   
   // slow speed drilling 
   stepper.moveTo(-9600); // position +60mm drilling 2/3
   stepper.runToPosition();
   delay(250);

   // fast speed movement 
   stepper.moveTo(-4800); // position +30mm / chip removal
   stepper.runToPosition();
   delay(250);

   // fast speed movement 
   stepper.moveTo(-9600); // fast advance to +60mm for drilling 3/3 
   
   // slow speed drilling 
   stepper.moveTo(-14400); // position +90mm drilling 3/3 end of drilling
   stepper.runToPosition();
   delay(250);

   // fast speed movement 
   stepper.moveTo(0); // return to starting position
   stepper.runToPosition();
   delay(250);
}

#include <Arduino.h>
#include <AccelStepper.h>
AccelStepper stepper(1, 9, 8); // mode 1 = half-step, etc... 200 steps/revolution
                               // pin 9 = PUL 8 = DIR

void setup() {
  stepper.setMaxSpeed(4000);
  stepper.setAcceleration(2500);
}

void loop() {
// screw pitch = 2.5mm/rev, motor = 200 steps/rev + 1/2 step mode = 400 steps/rev
// 30mm travel = 12 revs / 200 * 2 * 12 = 4800 steps

   // slow speed drilling 
   stepper.moveTo(-4800); // position +30mm drilling 1/3 
   stepper.runToPosition(); 
   delay(250);            

   // fast speed movement 
   stepper.moveTo(0); // position 0mm / chip removal
   stepper.runToPosition();
   delay(250);

   // fast speed movement 
   stepper.moveTo(-4800); // fast advance to +30mm for drilling 2/3
   
   // slow speed drilling 
   stepper.moveTo(-9600); // position +60mm drilling 2/3
   stepper.runToPosition();
   delay(250);

   // fast speed movement 
   stepper.moveTo(-4800); // position +30mm / chip removal
   stepper.runToPosition();
   delay(250);

   // fast speed movement 
   stepper.moveTo(-9600); // fast advance to +60mm for drilling 3/3 
   
   // slow speed drilling 
   stepper.moveTo(-14400); // position +90mm drilling 3/3 end of drilling
   stepper.runToPosition();
   delay(250);

   // fast speed movement 
   stepper.moveTo(0); // return to starting position
   stepper.runToPosition();
   delay(250);
}