This wouldn't be a flipper, it would be the Ball Launcher...maybe they are known as flippers two in the "parlance", I don't know; I never was a pinball wizard



Seems like you haven't set you constraint axis vector:


Code:

---

 function init_flipper()
{
 	
  var constraint1[3]=1,0,0;	  



phcon_add(ph_slider, my, 0);
	ph_con_setparams2(constraint1, vector(50,0,0),nullvector,nullvector); //this gives an error
	
	while(my!=null)
	{
	
		temp.x=-spring+random(200)-100;
		temp.y=0;
		temp.z=0;
			
		//punch ball out shoot			
		phcon_setmotor(constraint1, temp, nullvector, nullvector); 
		
		sleep(1);
	}
}  
 

---