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Uses and Types of Reamer

Uses and Types of Reamer

1. What is the purpose of a reamer?


A reamer is a rotary tool with one or more teeth that is used to remove small layers of metal from a hole's machined surface. The hole is reamed to a specific size and form after reaming.


A reamer is used to ream holes in previously drilled workpieces (or reamed). A reamer is primarily used to increase the hole's precision and eliminate surface roughness. A reamer is a tool that is used to finish or semi-finish holes with small machining allowances.


A reamer used to machine cylindrical holes is more prevalent, while a reamer used to machine tapered holes is less common.


2. Different types of reamers


1) A reamer's construction is primarily made up of a working component and a shank. The working component of a reamer is primarily utilized for cutting and calibration duties, with an inverted taper on the calibration place's diameter. The fixture clamps the shank, which comes in both straight and tapered versions.


2) The reamer is classified as a hand reamer or a machine reamer depending on how it is used; it is also classified as a cylindrical reamer or a conical reamer depending on the shape of the reamed hole (standard cone a reamer has 1: 50 taper pin a reamer and Morse taper a reamer two types).


Straight and spiral grooves are offered on the reamer. The most typical material for a reamer is high-speed steel with carbide inserts.


Machine reamers are separated into straight shank machine reamers and tapered shank machine reamers. Hand reamers are commonly made of alloy tool steel (9SiCr), whereas machine reamers are made of high speed steel (HSS).


3) Reamers are classified as cylindrical, conical, or stepped depending on the shape of the reamed hole.


4) There are two sorts of reamer installation clip methods: shank and set.


5) The tooth groove is split into two types based on its shape: straight groove and spiral groove.

The dimensional precision of the hole being machined, as well as the reamer production costs and service life, are all affected by the reamer diameter tolerance. Reaming "expansion" occurs when the hole diameter is larger than the reamer diameter due to radial runout of the cutter teeth, reaming amount, cutting fluid, and other reasons.


Because of the blunt radius of the cutting edge extrusion hole wall, the hole will recover and shrink, which is known as reaming "shrinkage." Both "expansion" and "contraction" components are usually present.


Reaming high-speed steel reamers results in expansion, reamer reaming with carbide results in shrinkage, and reaming thin-walled holes results in shrinkage as well.


A reamer's nominal diameter is the same as the hole's nominal diameter. The quantity of expansion, shrinkage, and wear tolerances should all be considered when calculating reamer variations up and down.


3. A reamer's tooth count and tooth grooves


Reaming accuracy, surface roughness, chip spacing, and tool tooth strength are all affected by the number of teeth on a reamer. Its value is usually dictated by the diameter of the reamer and the substance of the workpiece.


While a reamer's diameter is large, it's best to have more teeth; when processing tough materials, a reamer's number of teeth should be reduced; when processing brittle materials, a reamer's number of teeth should be increased.


The tooth pitch distribution of reamer teeth along the perimeter of the knife might be equal or uneven. A reamer is often made according to the distribution of equal tooth pitch to make it easier to manufacture.

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