Machine speed (in strokes per minute) is determined by the type and thickness of material being cut and the blade in use. Refer to Table 15-1 for the recommended speeds for various blades and materials.
For most general scroll work in hard or soft wood the higher recommended speeds will be best. Slower speeds should be used when working with very thin blades or hard, brittle materials or non-ferrous metals. Slower speeds are also good for thin stock or delicate materials such as veneer.
Some woods, such as walnut, tend to burn at higher cutting speeds, so both speed and feed rates must be reduced. A little practice and experimentation will be time well spent.