IMO tool life is determined by the amount of material cut and the associated tool stress level. Chip-load increases generally increase tool stress without necessarily increasing the amount of material removal. HSM (less than 4000 SFM for aluminum) appears to be the exception. You’re a pioneer - “no guts no glory” 
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While not directly part of the series, this fits in well:
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While not part of the series, we do have a video on cast iron up now:
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Another material:
Garolite/G-10
Brass:
Richlite:
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Two more videos on metal:
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Five materials are featured in:
- polyethylene plastic
- Corian
- Renshape foam
- Richlite compressed paper
- Ultem thermoplastic
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