Reaming, Boring, Trippaning and Broaching

Reaming

This is similar to drilling operation. It is basically utilized for finishing of holes and enlarging of small holes. Reaming is performed by the reamer, which has great number of flutes.

Boring

Boring is utilized to enlarge already generated hole or bore hole. It is carried out on boring machine.

Trippaning

Trippaning is the operation carried out to generate large hole without drilling. It is carried out by trippaning tool. Trippaning tool is hollow drill bit. It has only disadvantage that it only generates through hole and not utilized for blind hole. The trippaning tool is portrayed in Figure the function of tripanning tool is same as that of drill but only difference is that it generates the hole thoroughly.

   Figure: Trippaning Tool

Broaching

Broaching is the operation performed to enlarge hole especially, non-circular hole. It is carried out by broach tool. As pre needs, there must be an initial hole. Broach tool has multiple traverse cutting edges. Each successive cutting edge eliminates a layer of material giving steady approach to required final shape. The shape generated may be flat surfaces but more often, they are holes of several forms of grooved components such as the teeth of gear. Cutting speed and feed are kept low in this operation. Also sufficient lubrication is required during operation.