i have not have enough experience with wood milling and recently i was faced with some troubles. i need to mill a slot along of wood block. the slot is 4.5mm width and 6mm height.
at first look trivial task. but surprisingly it made the slot that has about 3.5mm width :(.
i prepared design and gcode in fusion 360 with following parameters and tools:
about 17000rpm, single flute carbide flat endmill tool 1/8 diameter and 12mm length, 2 passes with 3mm DOC for each pass, 350mm/min feed rate, climb milling.
the slot milling in 4 movements - 2 DOC levels and 2 movements on each level. slotting on forward movement and widening it in backward movement.
it looks like when it performs slotting at first movement (moving from -X to +X) it some why shifted about 1mm to Y+. And side surface of the slot looks scraped.
my guess that happened because the bit became blunted. near to end of the job i even was saw a smoke from the tool.
so my questions:
how you guys decide that a tool became blunted? is there a way to check it before a stock became a garbage?
did you see that blunted tool makes side shifting when cut a slot?
does my parameters enough good for wood? or it can inspire overheating of the tool and as result rapid blunting?
should i use conventional milling instead of climb for wood?