I used wet silicon carbide to lap pieces, wet emery works well too. I
found that even the smallest gap will indeed lower the effective mu.
TV yokes that's ok as it also increases the flux saturation point for
the assembly over a solid piece.
For RF work it can be helpful but for applications that require high mu
to live with the result. An example of a built up ferrite stack for a loop.
Laminated with no end to end gaps works very well. However end to
end gaps produce a measurable reduction in effective mu.
If you glue up the assembly use the thinnest bond possible and clamp
it. Avoid epoxy with metal fillers.
Allison
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