In an attempt to make a plant stand I was cutting some dados in some shelving wood bought from a big box store. I am using 7" dado craftsman dado blade that my grandfather gave me. I have no idea how old it is, nor really any idea of how sharp dado blades should be. I am using a craftsman contractor saw. When making the passes smoke starts come up from inside the saw. I assume that I am burning out my motor when this happens. Question is, is the saw not powerful enough for this kind of cut (cut depth was 1/4 inch) or is the blade not sharp?