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Both can be referred to as a kind of grinding process. In both cases, an abrasive material is used for better surface finish.
Lapping is process in which two surfaces are rubbed together with or without an abrasive material between them. The unevenness (protrusions) of the two cross-sections being rubbed with one another abrade each other, resulting in two almost similar surfaces.
Whereas, honing is controlled grinding. To give a better surface finish to a slot, honing is used. For example, the slot for the entry of key between the gudgeon pin and piston is honed to get a better accuracy and surface finish. Abrasive material is always used in honing.

Kindly correct me if i'm wrong.

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"Lapping" is a process through which surface roughness is reduced. "Honing" is a process through which the surface roughness and geometry is controlled. CIDesigner, gears were also frequently lapped together to ensure smooth operation and increased fatigue resistance, so lapping is not only planar.

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Lapping is process in which two surfaces are rubbed together for achieving superior quality surface finish the process is used where the sealing surfaces subject to extreme pressure are assembled without the gasket material(pure metal to metal contact). The process is done with abrasive material between the lapping surfaces. The abrasive material could be carborundum/diamond paste or it could be in the form of oil or liquid polish. Example: the assembly of a nozzle in a fuel injector of an IC engine. 

Honing Is done for making smooth surface slight rough so that the lubricating oil is adher to the sliding surface and thus by provide a lubrication film to prevent boundary lubrication between sliding surface. The process is carried out with honning tool and with a controlled rpm and the linear motion of the tool. Example:cylinder liners are honed internally.

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when two objects are comes in contact, and required contact surface area about to 100%, lapping is required, eg. any valve valve seat and sealing device, if the contact area is not about 100% chances of leaking is thre if not properly lapped. in that way lapping is done when sealing is required.

where as honing is require when fitments is the case. where sealing is not governing, but relative motion is the case for friction free movements.

correct me if any mistakes.

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(lapping ) It is a controlled mechanical sanding or polishing process that involves an abrasive between two surfaces that are rubbed together to create an accurate finish on a part. Depending on the material and application for the part, lapping can be one sided or two sided.

It  can be used to create a specific surface roughness. For Metal Cutting and our customers, the primary goal of lapping is to achieve a very accurate flat surface; however, lapping can also be used to obtain a domed surface, such as a convex lens or mirror.

The process of lapping can be applied to a wide range of materials, including metal, glass, ceramic, plastic, or silicon substrate. Thanks to the precision with which material can be removed, lapping can produce surface finishes in the nanometer (or 0.001 μm) range.

( Honing ) machines are metal abrading tools and process utilizing hard tooling and perishable abrasives stones for the correction of
  • Diameter
  • Shape
  • Surface finish
  • Positional tolerances of bores
The hone process was developed to allow for perfection of bore geometry, size control, final surface finish and surface structuring. The honing process provides the final sizing and creates the desired finish pattern on the interior of tubing or cylinder bores. Finishing is accomplished by expanding abrasive stones of suitable grit and grade against the work surface. The stones are rotated and reciprocated in the part with hone abrasive under controlled pressure. Combining rotation and reciprocation produces a cross-hatch pattern in the surface of the part being honed.




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For lapping a fine-grained tool with loose abrasive particles are used this makes the whole process gentle. For honing process a honing tool is used which is made up of hard abrasives. This is why with honing process even harder surfaces can be given a smooth surface finish easily. CNC Honing Machines are able to give an accurate surface finish to even hard metal work pieces. 

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