Reamer steel hardnesspdf

The reamer is used to finish machine a previously formed hole to an exact diameter with a smooth finish. It should not be used to significantly enlarge a hole (max. 5% – depending on material and hardness).

reamer, rotary cutting tool of cylindrical or conical shape used for enlarging and finishing to accurate dimensions holes that have been drilled, bored, or cored. A reamer cannot be used to originate a hole. All reamers are provided with longitudinal flutes or grooves (eight are commonly used) that may be straight or helical; cutting may be done on the sides of the tool, using the sharpened edges of the apexes between the flutes, or cutting may take place on chamfered edges at the reamer’s tip. The flutes permit passage of chips and allow cooling and lubricating fluid to reach the cutting edges. The two main classes of reamers are machine, or chucking, reamers and hand reamers. Machine reamers are used on machine tools such as drill presses, lathes, and screw machines. They have either straight or tapered shanks; hand reamers are slightly tapered to facilitate entry of the reamer and have a straight shank with a square end to fit a wrench. When it is necessary to enlarge reamed holes slightly, expansion reamers are available. These are split longitudinally, and their diameter can be adjusted by turning an end screw that expands internal cones. Reamers are made from high-carbon steel, high-speed steel, and cemented carbides.

Reamer steel hardnesschart

The reamer is an end cutting tool, cutting only on the chamfer’s edge at the outside diameter of the preformed hole. The standard 45º chamfer angle provides effective cutting action for most materials.

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Carbide tipped reamers are especially appropriate for close tolerance reaming. Because carbide is very highly resistant to wear, the reamer will produce accurate hole size and a smooth finish far longer than high speed steel or cobalt.