Making perfect dovetail joints can involve some shop practice, so consider starting out with a less-expensive jig that is designed for making only one or two types of joint styles. Then you can later work your way on up to the more expensive and versatile jigs that will let you make up to four or more styles of dovetails. With any dovetail jig, try to avoid using a router that is very light; heavier routers will produce crisper and cleaner cuts.
Oriented Strand Board or OSB consists of wood strands bonded with adhesives to form a mat. Like the veneer in plywood, these mats are layered and oriented for maximum strength, stiffness and stability. The individual strands are typically three to four inches long. OSB is widely used as construction sheathing, as the web material for wood I-joists, as the structural skins of structural insulated panels (SIPs), and in a growing number of other applications.