The tips are, usually, V shaped, at 30, 60 or 90 degree.
You can adjust the isolation width by milling depth.
The RF tips are 'like a normal' end-mills.
One can use phenolic paper PCB to reduce bit's wear.

Is there any way to return to 'Printer to PCB' or to switch to 'Toner to PCB'?

When using Dremel or other flex, take care about the XY tolerances and
repeatability!!

If interested, I can give you simple instructions to modify a Lexmark Z31
to accept a 1.5mm PCB.
Any good, practical, idea of FeCl resist ink in a printer cartridge?
Cristian


>How are the tip of the bits shaped? If they are flat like a normal milling
>bit then this may be difficult, but if they are V shaped like a countersink
>bit I would be tempted to try a normal carbide tipped drill as a bit if a
>fine enough one was available. It may be necessary to grind the tip to a
>sharp point, but you may get away with it for a quick development board
>without doing this or using an expensive tip.

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