While selecting a blade “Three Teeth Rule” should be followed and this requires that during cutting a minimum of three teeth be continuously in contact with the work.
Use a fine tooth blade or else metal wedges up between teeth, stripping them off. If the section is too thin to follow, the “Three Teeth Rule” use a very light steady stroke.
Use a coarse tooth blade with heavy pressure. This gives greater pressure per tooth and consequently a deeper cut. The larger space between teeth gives ample chip clearance.
Special care must be taken when cutting harder materials. It is better in terms of blade life to use finer tooth blades, with a light pressure and slower speed of cutting or else heat is built up rapidly on the cutting edge causing the metal to soften even in the case of High Speed Steel Blades. Faster speeds are permissible if a coolant is used.
Be sure that the teeth point away from the handle frame i.e. make certain that they cut on the forward stroke.