good afternoon youtube so i was working on the blade guide on my 7 by 12 horizontal vertical
band saw and i've been having some trouble with the blade wanting to tip in here and that was
related to these rollers being a little too far apart the reason i have this off is because these
things were seized up in here i couldn't get them to move so it was just easier to try to take this
thing off and i pulled the nuts and washers off of the studs there and i could get one of
them to move but not the other one so i've soaked them with a bit of penetrating oil and then i've
now cleaned these up on the wire wheel and got them nice and shiny got all the rust off of them
i've had these apart a few times and i've never really paid attention here but if you notice
this one if i spin the shaft in the bearings this one is centered got a nice perfect circle
it's basically a shoulder there there's a shoulder the bearings push on to this side held on with a
c-clip and then over here there's a shoulder that goes through here and then there's thread for the
nut and then on top there's a flat so you can turn this to adjust it and the other one's the same
except if you notice this one if i turn the the shaft you'll see this one is eccentric there it's
over that way and here it's over this way so i was assuming both of these shafts were
eccentric and it didn't matter which side you put them on but i have the eccentric one
on this side and i have the centered one over on the outside yes you can see
the blade guide would normally sit up here and what it's got to do is your drive wheel is
on that axis and you've got to twist the blade around push the bottom of the blade out and the
top of the blade in because it's pretty easy to push the top in but it's really hard to twist
the bottom out so i think the constant pressure on this one since i had the eccentric one there
it kept pushing or twisting this thing around and opening up the gap so i think i'm going to
swap these put the fixed post here and the adjustable one there and see how that works
okay i got the blade guide mounted back up there let's see if i can tighten this down
it's hard with that bolt head in the way that's why i took everything out so i could actually
get to it i think that's pretty tight yeah i think the problem was since i had the adjustable one on
the inside the blade would go over here and it was cutting kind of in the thing is you would set your
angle nice and square there but it would cut a couple of degrees in let's let's check this one
here i'll just give this guy a little bit of a tweak here see what that looks like
i don't know i think i went too far in i think it has to come over this way a little bit
yeah a little too much it's touchy when you get close in there just barely move it
yes i've got my square on the bed there and just slide that over get my light behind there
yeah i think that's pretty close so yeah this was one of the pieces i cut so the
saw was going this way and you can see how it cut in it was cutting in like that direction the vise
was square to the blade you can see now it actually isn't there's a little bit of a
offset there but this was the vertical you can see that's nice and square i had a nice vertical
cut i couldn't get a square cut in both directions there it was always off so much force on this
inside bearing being that it was adjustable it was pushing it farther over that way and
then making the blade guide loose so then i was trying to compensate by adjusting the angle here
but that really wasn't helping that's what caused this problem i could adjust the angle to fix
this verticalness of the cut but then doing so i threw off the squareness of the cut and then if i
tried to adjust the squareness and the vertical went out i was just chasing back and forth and
i couldn't get both things to get fixed at the same time so yeah i just figured take it apart and
figure out what's going on i should probably think about checking this one too like i say i hadn't
paid attention that one of these bearing posts is eccentric and the other one is concentric let's
see how vertical this goes here it's touching the square pretty much the whole way up and down
okay let's take a test cut here okay that came out pretty good there's the top side
so going down the direction of the cut there i'm pretty pretty close i mean that's about as
close as i can get it there's a very slight little wiggle and then if we go in the direction of the
cross cut it's still off a little tiny bit and see there's a little bit of a wiggle there so i'm
using this plastic as kind of a test thing since i have to cut a bunch of pieces of this i find
that these blades cut kind of funny in plastic they kind of tend to wander a little bit more
but i figure i'm making about eight cuts in this so every time you adjust the blade guide you also
have to then recheck the fixed jaw on the vise make sure it's still square because all those
things matter and then you also have to check the length of the part because if i move the blade
too much then the length of the cut gets too short and then i have a piece that's not long enough so
i think that's looking a lot better definitely a lot better than it was for sure and the the
idea here is i want to get these parts cut pretty square for a couple of reasons so the first reason
is they chuck up in the lathe square so you just put them in the chuck and drill them and face them
the other parts i had you had to adjust the part to sit square in the jaws the end wasn't square so
you had to do a couple of cleanup passes and then the other reason is if the saw is cutting crooked
you've got to allow for those cleanup passes so you use up more material so the straighter the cut
can be the less material you waste because you can cut the parts a lot closer to the finished size
so this again is the inside bearing this is the outside and i'll flip the saw on here
and you can see how this bearing is spinning because there's pressure on the blade
getting it to twist from the drive wheel that's like lined up like this
it's got to get twisted over so it's lined up plumb so there's a lot of pressure on this bearing
with the blade trying to go that way because i i didn't really find that in the uh manual they
don't really show you any super detail they kind of just give you an exploded view and say here's
all the parts and they don't really tell you it must go this way at least i will remember that
next time i'm working on this i can go refer to this video and take a look back at that
and not make that mistake again so i hope that helps someone and as always thanks for watching