Explain different types of reamers used in Drilling

Reamers are available in several different types, the most common are the following.

Chucking or machine reamers

The two types of chucking or machine reamers are the fluted and rose reamers, and they are intended to be utilized on machines. The teeth in the rose reamer have the backing and an end bevel. Only the beveled end was cut. For the purpose of moving cutting oil and giving room for chips, flutes are available.

Rose reamers are useful for rough reaming to get the hole to within a few hundred of a millimetre of its size even if they do not produce a very good finish. A hand reamer can be used to finish it at that point. Therefore, rose reamers are made to be between 0.075 and 0.125 rum smaller than their nominal size. For a given diameter, fluted machine reamers have more teeth than rose reamers. They cut along the side edges that form a cylinder as well as the beveled end, much like rose reamers do. When high accuracy is not required, a fluted machine reamer is a useful finishing tool that creates a superior surface finish than a rose reamer.

If a hole with interruptions, such as keyways or splines, needs to be reamed, helical fluted reamers should be used. Rose and fluted machine reamers are both manufactured with tapered and straight shanks. Taper shank reamers in sizes smaller than l2 rum are normally not recommended because of their high cost, while straight shank reamers in diameters bigger than 25 mm are difficult to grip.

Shell reamers

Solid reamers are only available in sizes up to 20 mm in diameter. Larger diameter reamers are constructed as shell reamers, with shells of high-speed steel installed on shanks of less expensive steels, for economic reasons. The shanks are of standardized construction and may be used interchangeably with reamers. These reamers are available in both rose and fluted designs. Fluted reamers can have straight or helical flutes. They are geometrically identical to rose and fluted types, except that the shanks are fitted independently.

Hand reamers

A hand reamer is primarily a finishing tool with a scraping motion. It is ground straight almost the whole length of its teeth. A little taper is supplied at the end of the reamer for a length equal to its diameter to allow it to enter and function as a pilot in the hole to be reamed. Only the reamer’s side or peripheral cutting edges are present.

For clearing, the teeth are somewhat eased. The shank end is squarely cut to accept a wrench. A hand reamer should never be used on a machine. Take care to ensure that the reamer starts aligned and true. The metal removed with a hand reamer should be no thicker than 0.125 mm. Roughing reamers feature circumferential grooves carved into the reamer length to aid in chip formation. Taper reamers are available in both hand and machine versions, with straight or helical flutes. Machine variations are fluted reamers with a taper shank designed to fit into a taper sleeve or the spindle of a floating reamer head.

Hand reamers yield the most precise diameters. When a highly exact hole is required, it is first drilled, bored, or machine reamed to around OJ25 mm under size and then manually reamed.

Adjustable reamers

Adjustable blade reamers are reamers with a size range that may be modified. Though they are more expensive than solid reamers, their flexibility to adapt to a wide variety of sizes, ease of resharpening and setting, and extended life make them a more efficient tool. They come in all common sizes, both hand and machine operated, with robust shank and shell structures.

Expansion reamers

Expansion reamers feature a bore that is slightly tapered and slitted along its axis to allow for a little expansion of 0.15 mm for a 6 mm reamer to roughly 0.3 mm for a 38 mm reamer. The expander is a tapered plug with a square head that is inserted into the end guide in the reamer.

Taper reamers

Taper reamers are similar to cylindrical reamers in that they have cutting edges on a tapered body. They are always created in pairs: roughing and finishing. Taper reamers should be removed often while reaming to clear the chips, as the chips do not easily come out. Taper reamers are extensively used in industry to produce tapered gauges for various sized taper pins as well as taper sleeves and sockets.

Bottoming reamers

The reamers mentioned above can be used to ream through holes. Blind holes with acute comers that must be cylindrical up to the bottom must be reamed using special reamers with end cutting blades. Bottoming reamers are similar to end mills in that they have cutting blades on both the end and the side. Because these reamers lack a beginning taper, they may not follow the previously machined hole.

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