I need to cut some ventilation slots through 18mm thick wood on the top of a
guitar amplifier I'm making.
I need a 3mm router bit, but they only seem to have a cutter length of 8mm.
Does anyone know where I can find 3mm straight cutters long enough to
penetrate 18mm wood?
Thanks a lot
that's a pretty long skinny bit you're wanting. long skinny bits have a
nasty tendency to break off under load, which is probably why you're
having a hard time finding one. you might consider cutting a bigger
hole and fitting the baffles back in or cutting the slots with a saw....
I agree that even if you found a router bit of this length, it would likely
I think the choices are a saw, as the other poster stated, or go for lots of
3mm drilled holes.
If you want a given open area, you could consider fewer, but larger diameter
holes, or fewer but larger slots. If you go with 1cm slots, you should be
able to find a router bit long enough. I would use a spiral style for this
type of cut.
If you really really *have* to have 3mm slots, you could rout them out on
the reverse side of the panel with a 6mm bit to within say 5mm of the other
face, flip it over and finish off with the 3mm on the visible face. Easy
enough to get the alignment with a simple jig and a guide bush.
Thanks for the replies all.
I've already drilled about 200 holes in a previous amp, and I don't fancy
doing it again!
I found a 5mm bit which is long enough, so I'll do a rough piece with a
drill bit to see if I like the larger slot width.
Deadlock's idea made me think of routing a recess on the top and then
slotting it so it looks like a proper vent panel. And yes, I have
considered buying a vent panel! Didn't fancy having a plastic square on the
Routing it out from the bottom sounds like a winner. And a similar approach
might work to allow you to create a proper vent grill out of thin aluminum
and fasten it from the inside. The aluminum should work with a carbide
router quite nicely while affording a proper grill vent.
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