At your risk.
All safety measures should be taken.
For example, eyes protection with suitable googles from flying particles.
Adequate hand protection.
Breathing protection from dust particles
Etc
Creating an air gap may prove useful to a microphone booster amplifier such as Pleiades V6 for making the output transformer.
Or similar ciruit single ended power amplifiers,
or other applications where quiescent DC (direct current) is present which can easily saturate the core.
The Pleiades V6 operates greatly without an air gap but it is may be a good exercise to compare the performance to an air gap core.
It was tried to create a thin airgap to a 1.3mm external diameter Siemens Epcos ferrite core with a jewler's saw.
It proved very difficult.
Good news is that ferrite does not brake but the cutting tool can brake.
More than half and hour was given and the ring core was only cut just at a little depth, about 1mm.
The cut stripe revealed a shiny metal material.
Could it be that this particular ring is not a ferrite one? Or is this how ferrites should look like when the protective outer gray layer is removed by cutting?
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