I made this small dust extractor for my table saw a few years ago but I've never
been quite happy with it because as you can see from all the sawdust right here
there's sawdust that makes it through and part of the problem is it uses a
filter that's folded so there's a filter in here and it's folded in here but I
always get a little bit of blow by and I just can't seal that up and also this
fills up pretty quickly with a fine dust and even so it's made enough to take
their course dust which means everyone's know I'll have to suck the dust out of
the table saw with a vacuum cleaner so it's very convenient that I don't have
to turn anything on separately but the performance isn't great
so when I built something more like the one I've got on my jointer and I'm going
to use this blower that I built as an experiment a few years ago and a filter
like this this will be the top half of the box and this will be the bottom half
of the box I'm gluing this box together with
construction adhesive because the plywood is quite rough and I need
something to seal those gaps I drill pilot holes for all the screws to avoid
splitting the plywood I put together the bigger and lower box the same way but
man I hate working with construction adhesive that stuff is so messy and
sticky
I use construction adhesive to Kalu some extra strips on there to give me a bit
more width but that glue is taking forever to dry so I would be working on
adding supports for the filter and taping that in but I gotta let that dry
first so for now I'm gonna figure out where this box goes right about here and
it's going to connect I'm using some elbows something like this and a piece
of hose in between so I need to figure out how to put the flange right here
sighs that a little too tight I think
I need a window in the box so I can tell how full is getting now filters like
this really aren't meant for this sort of application which is why I need to
modify them a little bit so I tore out the whole cardboard grid here so that
that way I can clean out the shadings a little bit better and I moved these
things to the other side these used to be on this side and these will help
support depletes against collapsing and it glued more pieces of cardboard in
here as well because if there's a substantial amount of vacuum that would
just squish these together and then there wouldn't be any airflow between
them and the other thing you have to make sure of is that these pleats go all
the way to the end and that they're glued in which they are on both sides
except for here it seems they got this a little bit crooked so there's a little
bit gap here so I'm just going to hot glue that together the better eliminate
that yeah
these strips of wood help hold up the filter and the duct tape in place
because I found that duct tape over long term doesn't stick very well this is
still below the level of the table saw table but I had the idea of adding some
wheels to it and if I do then it becomes above that level so I think you have to
inset these in the bottom some home
we hold much better on a clean floor
these two pieces of wood help keep the top of it aligned with the bottom
this weather stripping really doesn't stick that well to the wood I need
something to hold that lit down a little bit better gravity might not be enough
so I was figuring I wouldn't get shaving stuck all over the filter because the
table saw sawdust is mostly just small pieces but I guess I do get enough long
pieces over there I should put a screen in front of that so I don't know if in
turn the screen will plug up and cause problems but it's an experiment another
solution to this problem would be just to have a cyclone in front of the filter
but a cyclone has a huge amount of pressure drop takes up a lot of space
and takes a long time to build I don't think it's worth it here now there's one
problem I still have and that is that the saw is wired for 240 volts and the
blower runs on 120 volts and I want that blower to turn on automatically when I
turn on this saw so I still need to build some kind of relay box to
automatically turn it on but that's a whole separate topic so I'll make a
separate video about that