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This article is about the machining operation.Lapping is a machining operation, in which two surfaces are rubbed together with an abrasive between them, by hand movement or by way of a machine.This produces microscopic conchoidal fractures as the abrasive rolls about between the two surfaces and removes material from both.This is one twentieth of the wavelength of light from the commonly used 632.Surfaces this flat can be molecularly bonded (optically contacted) by bringing them together under the right conditions.Operation
2 Two Piece Lapping
3 Accuracy and surface roughness
4 Measurement
4.The lap or lapping plate in this machine is 30 cm (12") in diameter.For a commercial machine that is about the smallest size available.At the other end of the size spectrum, machines with eight to ten foot diameter plates are not uncommon and systems with tables 30 feet in diameter have been constructed.Referring to the second picture again, the lap is the large circular disk on the top of the machine.On top of the lap are two rings.In this machine, a small slurry pump can be seen at the side, this pump feeds abrasive slurry onto the rotating lapping plate.When there is a requirement to lap very small specimens (from 3" down to a few millimetres), a lapping jig can be used to hold the material while it is lapped (see Image 3, lapping machine and jig).Due to the dimensions of such small samples, traditional loads and weights are too heavy as they would destroy delicate materials.The purpose of Wikipedia is to present facts, not to teach subject matter.CPU and heat sink) together to get great mating.The idea of this is that, if you have a uniform particle sized abrasive, the two surfaces that are lapped against each other will abrade the high areas on each that are stopping the precision of the mating of the surfaces.Also, if you lap the outside of the two mating surfaces, you will cause some error.This will usually minimize the flex and pressure problems, but causes another problem.This error is lesser concern than the errors that is typically seen in single piece lapping.This operation can be performed by mounting the CPU on some sort of drill press.There are lots of issues with this operation, but it seems to hold the highest quality of an almost perfect mate between the heat sink and the chip.Surface roughness and surface flatness are two quite different concepts.Unfortunately, they are concepts that are often confused by the novice.Ra (average roughness in micrometers or microinches).Again, without resort to special equipment accuracies of 1 to 3 HLB are typical.Though flatness is the most common goal of lapping, the process is also used to obtain other configurations such as a concave or convex surface.Another method that is commonly used with lapped parts is the reflection and interference of monochromatic light.The monochromatic light is then shone down through the glass.As the light reflects in the gap between the workpiece and the polished surface of the glass, the light will interfere with itself creating light and dark fringes.Ra of 8 consists of peaks and valleys that average no more than 8 microinches over a given distance.This page was last modified on 18 November 2008, at 09:29.All text is available under the terms of the GNU Free Documentation License.Snake Charmer (CD, Maxi)
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