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		Manual Reaming - Course: Technique for manual working of materials. Trainees' handbook of lessons (Institut für Berufliche Entwicklung, 18 p.)
			(introduction...)
			1. Purpose of reaming
			2. Tools for reaming
			3. Construction of hand reamers
			4. Operation of reamers
			5. Technological process of reaming
			6. Checking of straight reamers
			7. Indication of fits on the straight reamer
			8. Special recommendations for making conical bore holes true to size

6. Checking of straight reamers

Mostly, these reamers have an even number of cutting edges two of which are facing each other. As a result, the diameter of the reamer can be determined by an external micrometer. However, this is not very useful.

Straight reamers produce a bore hole within a set range of accuracy.

One cannot infer the exact diameter of the bore from the exact diameter of the reamer.

Faults with the process of reaming or dull reamers may cause deviations of several hundredth of a millimeter.

Therefore, a test bore must always be made: on the basis of the checked bore it can be found out whether the respective reamer can be used or not.

Note
Readjustable reamers must be adjusted by a ring gauge or external micrometer before reaming; then, a test bore has to be made.