i need to make a blower for the integrated dust collection on this router table and
for that i want to use this motor and the only spec i've got for it is is 0.75 amperes
so i made a wooden paddle to go on here and just spin that and with that size paddle it draws
0.75 amperes so that tells me i can spin an impeller that's this big
so i started out with this piece of plywood and i laid it out for
eight blades on the impeller just because that's really easy to lay out and i cut those by marking
the radiuses on a piece of 2x4 and i cut those out on the bandsaw and sanded them smooth and then for
gluing those onto this piece of plywood it turns out this plywood isn't entirely flat so i had to
clamp this piece of plywood to a flat piece of plywood before gluing on the blades and then
hopefully the whole impeller will end up flat now i started out by clamping all the blades on there
but actually light pressure is much better because that way you don't squeeze out too much of the
glue having a bit of a gap that's full of glue actually makes for a fairly strong joint stronger
than if you clamp it hard so i took the clamps off and just put a whole bunch of weights on there
and then i made this front disc to go on there and to cut this hole here was actually the first
time i used my scroll saw in probably three years cutting holes like that for blowers is
the only time i use a scroll saw and i've made a few blowers like that including this one here and
the one that's on here that's using a dishwasher motor those are really great motors
and the one on this dust collector and the one on that dust collector and the one that's on
this dust collector i really need to give this a day for the glue to dry because when
i release the clamps this will be under tension because that plywood wants to warp a little bit
so i started working on the blower housing which is a volute i think that's what the
shape is called type of thing so the space around the impeller gets wider as it goes around for the
air to then eject out of here and i've literally been making this thing by just about sketching
it by hand and free handing it on the bandsaw if you want to have more details about how to make a
blower like this watch some of my other videos about building blowers i carefully transferred
my alignment marks to the tops of the blades then applied a thick layer of glue to all of
them and then using those marks applied the top impeller disc and clamped it down on all sides
mounting these motors is always a challenge fortunately this one has screw holes on the front
but i had to add recesses on the back plate so that the screw head wouldn't hit the rotor
and pads on the other side so that the air holes here would still get some air
and an extra pad on here to get more engagement plus a hole that fits around here
so let's see how that fits on here i need to add another flange on the inside
i was just making this flange and i cut my finger
i was drilling a hole in this thing here which i cut an angle so it'd be like this
and the drill got caught as it went through and spotted my fingers and it's sharp enough to cut me
so now i just need to glue this on here except i realized i cut this way too thick so
i'll cut that thinner on the table saw and i won't hurt myself
so
the rotor was slipping on the motor shaft because i hadn't locked it on there yet so i took the
rotor off filed a notch in the side of the hole and then put it back on there and put a screw into
that notch right up against the flat face on the motor shaft okay now is it going to work this time
well that still needs some balancing
i'm pleased with how little it wobbles but it clearly has a heavy side
i balanced it by sanding a little bit off of one side
of the rotor and adding a little bit of weight on the other side
and then gluing all the pieces of the housing onto the plywood
this would have been easier for taking the motor out but i was too lazy
now i haven't got a cover for this blower but i figure i will mount it on the cabinet
right about here so i'll just cut a hole in the back panel and that'll become the front for this
so static pressure is five centimeters not a lot but this is also only a 1700 rpm motor
with an air speed of seven meter per second in the hole size i worked it out to
.08 cubic meters per second or 167 cfm and that airflow will be a fair bit less once
it's sucking through a filter and through a hole in the top of the router table
so the filter is in the back of the cabinet and this part here is to keep the filter from getting
sucked too much against the back here from the vacuum
and there's a bit of space between the filter and the back plate for the air to move around
so i'm getting a bit over three meters per second going in here
and across that area that's actually the same amount of airflow as i had with just a blower
but that's because the filter is still clean it will suck the sawdust away from a fair distance
i'm drilling small pilot holes where i pivoted the wood and then drilling
in from both sides with a bigger drill to avoid tear out where the drill comes out
this is the old top i was using with my tilting router lift and the insert is fairly large because
when i tilt the router lift and bring it all the way up the body of the router actually protrudes
through the table which is why i've got this other insert here and i want to make it even
bigger because i want to have a hole behind here so that i can suck dust in through the fence
i want to get the insert hole exactly rectangular so i
plunge cut it with the table saw and then finished up the corners with a jigsaw
uh
and then i realized i forgot to leave a ledge to hold up the insert so i wrote some notches into
the sides of the hole and then put some wooden pieces in there to provide a lip for the insert
i built this fence for my tilting rotor lift and i angled this part here to allow it to
fling the chips out better that way but then later i added this part
here so i could suck away the chips with a hose and i don't need that anymore now it goes over
this hole and now i have this part here to direct the chips down and into the router table
so let's see how it does not impressive but that was with the front door open
and finally time to try it out i figured i'd make a whole bunch of dowels for my stash of dolls
just to have something to route and i had my dulles air quality monitoring while i
was running this and the dust levels in the air did not significantly increase
i got a lot more room for chips down here before they get sucked into the rotor and i added this
sheer fabric in front of the filter to keep the coarse chips from getting stuck in that felt and i
built it to be just a tiny bit lower than my table saw so i could also use it as an outfeed table