Zigii

Thanks for advice, @Jack and @Rodrigo
 
I found the following code (below) which solved my problem.
 
It creates a series of SVG rectangles dynamically (my 'sawdust') and appends these to the main SVG (the circular saw), making alignment pretty much a breeze.
 
All sorted.
 
const svgns = "http://www.w3.org/2000/svg";
const demo = document.querySelector("#demo");
for (let i = 0; i < 200; i++) {
  let newRect = document.createElementNS(svgns, "rect");
  demo.appendChild(newRect);
  gsap.set(newRect, {
    attr: {
      x:100,
      y:425,
      width: "random(10, 20)",
      height:  "random(10, 30)",
      fill: "random([#000000, #A9A9A9, #d3d3d3, #C0C0C0, #B2BEB5, #708090])"
    }
  });
  
  gsap.to(newRect, {
        duration: 2,
        opacity:0,
        physics2D: {
            velocity: "random(200, 650)",
            angle: "random(250, 255)",
            gravity: 300
        },
        delay: "random(0, 2.5)",
    });