</font><font color="blue" class="small">( The crew on the side of the hihway runs all the limbs big or small into a machine i always assumed was a
chipper )</font>
I think you are right. Most commercial machines have a powered roller fed hopper. I have seen many of these self-fed machines do a fine job of chipping both large and small limbs. The cheapest of these I've seen is about $6,000. On our smaller machines, the 5" feed opening to the
chipper means you will have to take a stick and force the small stuff into the hole so the
chipper can get at the material. With a shredder, as soon as any part of the small limb touches the shredder drum it self-feeds the rest of the material in a flash. The issue here is just a case of efficiency. Since I have my shredder which will dispose of 1-1/4" and smaller diameter material almost instantly by simply dropping it into the hopper, why would I stand in front of the
chipper chute trying to use a stick to poke material into the
chipper blades. For an under-$3,000 machine, I just think the
chipper-shredder combination is the most efficient way to go.