FAQ – Semi Conductors

In the manufacture of Semi Conductors, the smoothest, most immaculate surface finishes possible are required.  What is the best finish surface finish possible in this process?

Reaching the desired surface finish is really governed by the limitations imposed on the process by the surface finish at start and the amount material removal allowable to reach the targeted finish.

What dimensional tolerances can Extrude Hone hold?

We can hold tolerances within 1 – ten-thousandths of an inch (.00001).  A human hair is approximately three to four thousandths of an inch in diameter (.003-.004).  That is some 30 to 40 graduations of the tolerances we can hold.

Do you actually remove material when polishing metal?

Yes, we do.  How much material removal depends on the roughness of the surface at start.  An average machined finish would require removal of approximately .0015-.003 inches of material.

How do you control the amount of material removed?

Primary variables are the tooling, the media flow pressure, the viscosity and abrasive concentration of the media.

The tooling is a holding fixture that directs media flow to the target area of the part, while protecting areas where abrasion is not desired.  Media flow pressure available has a range of 200 to 2000 psi.

The media carrier, silicon rubber, comes in three basic viscosities:  high, medium and low; while the silicon carbide abrasive ranges in size from the fineness of baby powder to the coarseness of buckshot.

All these taken together are manipulated to produce the desired result on the workpiece.  For this reason, each and every application destined for Extrude Hone AFM has to be engineered and developed.
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