Introduction to Basic Manufacturing Processes and ... - always yours

Fitting 389
Hand drill
Pneumatic drill
Drill chuck
Drill
Job
Electric drill
Breast drill
19.2.5.5 Reamer
Fig. 19.45 Types of hand drilling machine
The drill does not always produce the correct hole some time with good finish. Thus a
correct hole is produced with good finish of a pre drilled hole using a reamer. A common hand
reamer is shown in Fig. 19.46. It is commonly employed to remove minimum amount of
metal (100 to 150 micron for rough reaming and 5 to 20 micron for fine reaming) from the
hole. During reaming operations, the job should be properly supported and rigidly held. A
stock wrench of appropriate size for holding the reamer is used. The reamer must be kept
in its correct position relative to the job. It must be run slowly and excessive feed must be
avoided. It should be always be turned in the cutting direction. Sufficient amount of cutting
fluid should also be employed. When removing the reamer, it must be turned in the cutting
direction. Reamers with blunt or chipped edges must not be used.
Hand Reamer
Taper on end of
hand reamer
Fig. 19.46 A common hand reamer