PROPER SELECTION OF BLADE
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.

Thin Sections
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.

Thick Sections
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.

Hard Sections
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.