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Name: surface
Status: N/A
Age: N/A
Location: N/A
Country: N/A
Date: Around 1993

I am Ph.D. candidate at Seoul National University in Korea. I am going to assemble a Ultra-high Vacuum apparatus and make a "conductance-- limiting pinhole." The pinhole will be made through thin metal foil (Thickness < 0.05 mm). The diameter of the pinhole is less than 0.01 mm. I heard about "laser-drilling," but that technique is not available right now. What is difference between "mechanical drilling" (by use of Drill) and "Laser drilling"? What method is suitable for making pinhole through such thin foil?

Laser drilling is most certainly available and done on a daily basis at some precision fabricating house. If you are in a major city, check the yellow pages under sheet metal fabricators and check the advertisements for those that have laser capabilities.


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in another small container called, you guessed it, the absorber. From there this concentrated solution flows back to the generator to complete the cycle. This is the type of refrigerator that is seen most often in campers and RV's.