Circular Saw Blades

Circular Saw Blades

Circular Saw Blades- -Blades for circular sawing or cold sawing machines are similar to the metal slitting saws used with milling machines. Solid blades with diameter not exceeding 400 mm are used in circular sawing machines. Their use is limited because of cost and because broken or worn teeth cannot be replaced.

Most large cutters have either replaceable inserted teeth or segmental-type blades! The inserted teeth are made of high speed steel or tungsten carbide; the remainder of the disk is made of ordinary, less expensive and tougher steel. Segmental blades are composed of segments mounted around the periphery of the disk, usually fitted with a tongue and groove and fastened by means of screws or rivets.

Each segment contains several teeth. Both inserted teeth and segmental type blades are ecol1omical from the stand point of cutter material cost and have the additional advantage that only worn teeth need be replaced to restore the saw to operating condition.

Inserted tooth are used on large circular saws, some as large as 180 cm in diameter. Each tooth made of H.S.S. or tungsten carbide is a separate piece that is fastened to the central disk by means of wedges or screws or by brazing.

In the type of teeth found on, most circular metal saws. The teeth are alternately ground so that one half of them are 0.25 to 0.50 mm higher than the rest. The high teeth are for rough cutting and have a 45° chamfer an each side; the others, ground square across and are the finishing teeth for cleaning up both corners.

-Blade widths increase with diameter varying from 2 mm to as much as 8 mm.

-Tooth pitches range from very fine at 3 mm to very coarse at 16 mm. Fine pitch blades are used for cutting solid up to 12'7 mm and tubing, medium pitch blades for cutting solids from 12'7 to 37 5 mm and coarse pitch blades for cutting solids above 37'S mm.