Reaming
Reaming removes a small amount of material from the surface of holes. It is done for two purposes: to bring holes to a more exact size and to improve the finish of an existing hole. Multiedge cutting tools are used as shown in Figure . No special machines are built for reaming. The same machine that was employed for drilling the hole can be used for reaming by changing the cutting tool. To obtain proper results, only a minimum amount of materials should be left for removal by reaming. As little as 0.13 mm is desirable, and in no case should the amount exceed 0.4 mm. A properly reamed hole will be within 0.0254 mm of correct size and have a fine finish.
Types of reamers:
Types of reamers:
• Hand reamer;
  – Straight-fluted hand reamer
  – Taper-fluted hand reamer
• Machine or chucking reamer:
  – Rose
  – Fluted
• Shell reamer
• Expansion reamer
• Adjustable reamer:
  Adjustable Hand Reamers are designed with enough adjustment to ream almost any odd size hole encountered in reaming. The blades are made of high speed steel for long life and can be adjusted by loosening one nut while tightening the other. They are used mostly for repair work in the field. They are also known as Adjustable King Pin Reamers.

For hand reaming or production reaming. Square handle grip provided. Ideal for excellent finish and thru hole applications. Best results are obtained if hole is pre-drilled a few thousandths smaller than the small diameter of finished reamed hole. Carbide Reamers have great abrasive resistance, provide consistent cuts and smoother finishes than other tools. Ream two-thirds the speed of drilling and Feed at 200%-300% higher than drilling to prevent chatter and reamer wear. Allow .010 on 1/4 dia. hole, .015 on 1/2 dia. hole, and .015 up to .025 on a 1-1/2 hole. Aim for perfect alignment of the Spindle, Reamer, Bushing and hole to be machined.

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