If it interests you, some people sharpen their blades. Apparently, a
sanding/cutoff wheel in a Dremel can be used to cut new teeth in the
multifunction tool blade. I've never heard of a set being put on the teeth
and doubt it's necessary as long as your blades aren't getting stuck. Just
ensure that new teeth are clean and flat.
I had almost the exact same project except my holes for soffit vents were 8
inches by four feet. I tried several of the same tools you did.
What finally worked best for me was a branch-trimming chain saw!
Oh the edges of the resulting hole were not, er, "neat," but they were being
covered by a home-made screen, so the irregularities did not show.
And, as another responder said, you CAN "sharpen" a worn-out blade by using
a rotary Dremel to cut as many 1/8" slots in the blade as you can muster.
I found another use for my MF yesterday. I replaced a strike plate
for a door latch. The new one was larger than the old one and I had
to enlarge the mortise to set it in, and the hole behind the catch
hole. The MF worked great, a few seconds each cut and there it was.
QUESTION: The teeth on the cutter don't have any 'set'. Would this
work better with 'set' teeth? Is 'set' simply to allow saw dust to
get out of the way? Of course, having no 'set' is probably the reason
that the tool does not 'grab' and cut into the template as you slide
Very doubtful if it blade would work better with set in the teeth. Teeth
are often set to create a wider kerf so that the work does not pinch the
back side of the blade.
Because the tooth travel is greatly limited you need to still use the tool
as if using a hand saw to clear the dust out of the teeth. Fein instructed
me to work the tool back and forth as if slicing a loaf of bread. FWIW
there are blades that do have a set and that do work with these type tools,
I have found that they do not perform better as a rule and leave a jagged
Considered skill saw, saber saw, roto-zip and oscillating tool.
I used my router for this job - I guess akin to your roto-zip. I
tacked the template to the wood and routed out the opening nicely,
clean and with little difficulty (well, I was working upside down on a
ladder with a fear of heights).
I was only adding extra ventilation so only did ten or so openings.
Did you use the cheap model or the more expensive variable speed unit?
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