Advice on CNC'd plywood horn enclosures

Size of tool, depth of cut, chip ejection {air!}, cooling ... will all dramatically affect tool life. Burying a 1/4" tool into in
a single pass in 3/4" stock with chips obscuring the cut ... yields short life. I've had some 4 flute HSS 1/2"
shank tools .... for years. where typical DOC is 1/8".

and yes, material matters as does surface speed.
 
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