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lapping tests..

post #1 of 9
Thread Starter 
Hey everyone,
when people lap their stuff they always say "i did the knife test" to check if it was flat, or "I used the light test"... I would want to check my job, but how do I go about it?

Give me more explanations on how to do these tests please.

Thanks!
January 2007
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January 2007
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post #2 of 9
Basically an object with a known straight edge is placed onto the surface of the lapped item. You then place the object, with straight edge, in front of a light and look where the edge meets the lapped surfaces. If both surfaces are perfectly flat, a very minimal amount of light will show through between the two surfaces.

If your straight edge isn't straight, this is a useless test. Most razor blades, when new, are pretty reliable for straight edges.
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post #3 of 9
Lol, I use a CD to check if it's flat.
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post #4 of 9
If you have some window screens, put your HS up to that. If there's any imperfections, some of the wires will appear to be bent on the base.
post #5 of 9
If you want to get really picky, check out laser interferometry
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post #6 of 9
Graph Paper... you can download & print some out form the internet. Also you can use a ruler and if the lines are not warped your usually go to go.
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post #7 of 9
Quote:
Originally Posted by JeffB View Post
If you want to get really picky, check out laser interferometry


now that is "going the extra mile!"

Graph paper, a ruler, or fine print work well.

Such techniques will reveal convex or concave surfaces as well as surface uniformity.

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post #8 of 9
graph grid is posted in the first post of... this thread
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post #9 of 9
I straight-edge and use a piece of graph paper.....
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