[Solved] A Ø 6H7 Hole Is To Be Reamed In A Steel Work Piece. W

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Concept:

A reamer is a multipoint cutting tool used for enlarging by finishing previously drilled holes to accurate sizes.

For reaming with a hand or a machine reamer, the hole drilled should be smaller than the reamer size.

Calculating drill size for reamer

A method generally practised in workshop is by applying the following formula:

Drill size = Reamed size - (Undersize + Oversize)

Finished size is the diameter of the reamer.
Undersize is the recommended reduction in size for different ranges of drill diameter.

Diameter of ready reamed hole (mm)	Undersize of rough bored hole (mm)
Under 5	0.1 – 0.2
5 – 20	0.2 – 0.3
21 – 50	0.3 – 0.5
Over 50	0.5 - 1

Oversize is generally considered that a twist drill will make a hole larger than its diameter. The oversize for calculation purposes is taken as 0.05 mm - for all diameters of drills.

Given: Ø 6H7 hole

Calculation:

Finished size = 6 mm

Under size as per table = 0.2 mm

Over size = 0.05 mm

Drill Size = 6 – (0.2 + 0.05) = 5.75 mm Download Solution PDF Share on Whatsapp

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