What determines the final diameter of a hole after reaming?
The size of the reamer used
Reaming is a finishing operation that follows drilling; its purpose is to bring a hole to an accurate size and a smooth finish, not to make the hole from solid.
A reamer is a multi-edged tool with a fixed, precise diameter that removes only a very small amount of material left in the pre-drilled hole.
Because the tool's diameter is fixed and the reamer is guided by the existing hole, the finished bore comes out to the size of the reamer itself.
So the final diameter of a reamed hole is set directly by the size of the reamer used.
The hardness of the workpiece affects cutting force, tool wear and finish, but it does not change the reamer's diameter, so it cannot set the final size.
The rotational speed and the type of lubricant influence surface finish, heat and tool life, yet they too leave the tool's diameter unchanged.
Since none of those alter the reamer's fixed size, the hole size follows the tool.
The size of the reamer used
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Important Questions from Drilling and Reaming
What is the point angle of the drill used to drill copper?
The clearance angle of a drill is between ______.
What is range of drills provided on a Morse taper?
Which of the following formulas is used to calculate rpm where cutting speed and diameter are known?
The Morse standard taper is available in _______ numbers.
