I built a total of three bandsaw so far
one of which is right behind me and my
first one an 18-inch bandsaw is here and
I want to build a bigger 20-inch (50 cm)
bandsaw and i'll start by making the
wheels the design of these wheels is
going to be very similar to those on my
16 inch band saw. It's best to start
with good materials but i like to use
old crap like this shipping crate
plywood
I could finish the cuts on the jigsaw
but that's a lot quicker the plywood
It wasn't big enough for continuous circle
so I'm piecing it together and
reinforcing it with dowels.
I just went shopping and I bought the
shaft and the bearings and these
bearings are 52 millimeters outside
diameter which means to get a hoe of
the right size i need to set this to 26
millimeters
my first test hole is too small I need a
tight fit but i think this is too small
by two millimeters almost so I have to
make a bigger test hole
Iway overcompensated way to lose
ok this is actually the fourth attempt
this is actually a pretty good fit
because i want that to be in there super
tight
this was actually just a test fit the
actual flanges are going to be out of
much higher quality baltic birch plywood
the only way to get the bearing back out
is to destroy the test flange
the bearings need to fit
just super tight. If you can get them at
all in there with a reasonable amount of
force they will work themselves loose
In earlier bandsaw builds Ialways clamped the
flanges on by putting bar clamps through
holes in the wheels but I found those
always moved the flange a little bit so
by making these clamps I can avoid
Ididn't get all the wobble out. The glue set up a little bit too fast for me
so for the lower wheel i did all the
alignment now without having added any
glue to it but I added these two small
screws and just have to make sure I put
this on the same way again with the glue
and hopefully my alignment will be good
because of the screws
and I've got the screws sticking up just a little bit and
I have a marked on here and here so just
trying to hit the old screw holes
And the alignment is still good so now i can
clamp that and check it some more
that's acceptable considering how a
non-flat my plywood is this is now my
third band sound build that i'm using
this temporary pulley which I made from a
piece of plywood by cutting some slots
it on the table saw
if you're afraid of doing that you can
just use three layers of plywood.
I have a small utility motor 1750 rpm
with a 2-inch pulley and i'll
use that to spin up the wheel and this
clamp on here make sure that pulley
doesn't slide away on me
now the actual circumference and aiming
for is a 156.4 centimeters
261 centimeters so I've got quite a bit
that Istill need to turn off of here.
I've now got the wheel turned flat and to the
right radius now I just have to turn a
crown on to it but the crowd turn onto it
Got the crown turn onto it and danded, and this wheel is done.
adding an extra layer to a drive wheel
which allowed me to offset the pulley later
The screws were in there just for clamping
This ring which is made of two layers
of plywood is going to form the pulley
for the lower wheel
so the wheel has clearly got a heavy spot
down here so i should drill that out
but how much so to gauge that I'm
putting some blocks on top of here to
see if that's enough to balance it
and those seem to just about balances It
I should really drill out as much wood as
corresponds to the weight of these
so I've had to drill out quite a bit
here to balance it but that is a
function of using very cheap plywood
The top wheel wasn't as bad only have to drill
one hole here
The inside of the bicycle inner tube is covered with the powder to
keep it from sticking to itself but we
want that too to stick to the wheel as
much as possible
I still need to take that tube off again
again and varnished a whole wheel but as
you can see this new band is going to be
quite a bigger than this one