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When I acquired my band saw a few years back it was in bad need of new tyres but the cost of two "big rubber bands" exceeded what I payed for the saw, so I adopted my usual stance on such matters and just ignored it. Now with the new printer and its large print bed I have a nice TPU tyre for around ?1.50!? ?And people ask "what on earth do you need a 3D printer for?"  Removed from the print bed and stretched a little the serpentine shape is unnoticeable.? I'll have a go at fitting it next week and post the results.
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Man , that's a killer idea . What size tires are the ones ya
printed ? I need a set for my 14" saw & another larger saw . I
don't know if I could even do a 14 one on my printer though , but
my gears are turning now .
thanks
animal
On 3/3/24 1:57 PM, Julian wrote:
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Show quoted text
When I acquired my band saw a few years back it was in bad need of
new tyres but the cost of two "big rubber bands" exceeded what I
payed for the saw, so I adopted my usual stance on such matters
and just ignored it.
Now with the new printer and its large print bed I have a nice TPU
tyre for around ?1.50!? ?And people ask "what on earth do you need
a 3D printer for?"
Removed from the print bed and stretched a little the serpentine
shape is unnoticeable.? I'll have a go at fitting it next week and
post the results.
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Excellent Julian, thanks for sharing.? Necessity is the mother of invention. 3D printers have allowed me more versatility in the way to approach the "fix it" or "repair situations" of everyday living. My wife and I both have mobile phones, so I have recently designed and 3D printed a double docking station "wall mounted" for recharging,  Hope of interest -- John
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Julian
What drafting programme did you use to create the shape in the photo, guessing "9 curves" ? after measuring the circumference of the wheels.
Also did you have to deduct the overall length of the 3D printed tire to grip the wheel/pulley ?
A very interesting project, I also need to "fix" my bandsaw, it has been a back burner job for a few years? and finding spares for my? old Taiwan machine is impossible.
Thanks again for sharing.
--
John
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??? What size is yer bandsaw John ? I have a real generic 14"
& I've just picked the saw that looked the most like mine over
at Grizzlytools & ordered parts off that saw's partlist &
so far all the parts I have ordered? have fit .
animal
On 3/3/24 8:28 PM, John Lindo wrote:
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Julian
What drafting programme did you use to create the shape in the
photo, guessing "9 curves" ? after measuring the circumference of
the wheels.
Also did you have to deduct the overall length of the 3D printed
tire to grip the wheel/pulley ?
A very interesting project, I also need to "fix" my bandsaw, it
has been a back burner job for a few years? and
finding spares for my? old Taiwan machine is impossible.
Thanks again for sharing.
--
John
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Mike I will measure the diameter?of the wheels and let you know. FWI, I have to buy special but welded ( not off the shelf) blades 1555 mm , normal size I believe for a typical Harbour Freight is 1400 mm.? My machine is old, I bought it at a bargain price LOL Gr!!!!!!!!!! at a flea market, certainly they saw" PUN" me coming, but have done OK for 12 years. Especially when sawing up frozen meat. LOL Have a good week John
On Mon, 4 Mar 2024 at 06:25, mike allen < animal@...> wrote:
??? What size is yer bandsaw John ? I have a real generic 14"
& I've just picked the saw that looked the most like mine over
at Grizzlytools & ordered parts off that saw's partlist &
so far all the parts I have ordered? have fit .
animal
On 3/3/24 8:28 PM, John Lindo wrote:
Julian
What drafting programme did you use to create the shape in the
photo, guessing "9 curves" ? after measuring the circumference of
the wheels.
Also did you have to deduct the overall length of the 3D printed
tire to grip the wheel/pulley ?
A very interesting project, I also need to "fix" my bandsaw, it
has been a back burner job for a few years? and
finding spares for my? old Taiwan machine is impossible.
Thanks again for sharing.
--
John
--
John
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Hi,
What is this printed part usage on a band saw ? A more general
picture would be useful. Thks
On 04.03.24 03:48, mike allen via
groups.io wrote:
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Man , that's a killer idea . What size tires are the ones ya
printed ? I need a set for my 14" saw & another larger saw .
I don't know if I could even do a 14 one on my printer though ,
but my gears are turning now .
thanks
animal
On 3/3/24 1:57 PM, Julian wrote:
When I acquired my band saw a few years back it was in bad need
of new tyres but the cost of two "big rubber bands" exceeded
what I payed for the saw, so I adopted my usual stance on such
matters and just ignored it.
Now with the new printer and its large print bed I have a nice
TPU tyre for around ?1.50!? ?And people ask "what on earth do
you need a 3D printer for?"
Removed from the print bed and stretched a little the serpentine
shape is unnoticeable.? I'll have a go at fitting it next week
and post the results.
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Pierre. I will step in for Julian if OK. Basically it is a tyre or in the US called "tire", normally moulded of some rubber compound. It fits on the circumference of the driver and driven wheels.? Very similar principle to a car tyre, (a) assist in traction between the saw blade and the spoked wheels, (b) slightly radiused on the outer side to assist in keeping the blade from walking off the wheels. Normally the top wheel can also be fine tuned by tipping front to back, again to stop the blade from walking off the wheel. Cheers
On Mon, 4 Mar 2024 at 15:14, Pierre-Raymond Rondelle via <pierreraymondrondelle= [email protected]> wrote:
Hi,
What is this printed part usage on a band saw ? A more general
picture would be useful. Thks
On 04.03.24 03:48, mike allen via
wrote:
Man , that's a killer idea . What size tires are the ones ya
printed ? I need a set for my 14" saw & another larger saw .
I don't know if I could even do a 14 one on my printer though ,
but my gears are turning now .
thanks
animal
On 3/3/24 1:57 PM, Julian wrote:
When I acquired my band saw a few years back it was in bad need
of new tyres but the cost of two "big rubber bands" exceeded
what I payed for the saw, so I adopted my usual stance on such
matters and just ignored it.
Now with the new printer and its large print bed I have a nice
TPU tyre for around ?1.50!? ?And people ask "what on earth do
you need a 3D printer for?"
Removed from the print bed and stretched a little the serpentine
shape is unnoticeable.? I'll have a go at fitting it next week
and post the results.
--
John
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Pierre-Raymond,
It's a tyre for a band saw wheel.? I'll post photos once they're fitted which will better explain things, but imagine what you see in the photo stretched out to a circle and wrapped a wheel to become a tyre.? There are two wheels and the blade runs around the wheels.? The tyres help the blade grip the wheels and prevent the blade rubbing on the metal of the wheel.
John and Mike,
I worked out I needed an inner circumference of 1021mm and settled on 1018 or 9 can't remember.? I'm relying on the tyre being able to stretch a bit.
I drew it in Fusion.? In a Design Workspace Sketch there's a tool they call "Blend Curve".? Never used it before and from their description I wasn't quite using ti as intended.? From days when I used to do a lot of graphics I know this as?Bézier curve tool which draws a line with "nodes" and "handles" emanating from the nodes.
All I did was to draw the print area then approximately draw shape with the blend curve tool within the build area, clicking several times to generate nodes and then getting it as smooth as possible by manipulating with the handles.? It's pretty self explanatory once you start playing.? ?Not very scientific, but as I was smoothing the curve I kept using the measure tool which will give you the perimeter dimension of the shape.? Dragging a node towards the center will reduce the size and vice-versa, obvs!.? ?Just keep adjusting until you have the circumference you require.? There after it's? a simple matter of using "offset" to create the belt thickness and "extrude" its width.? Printing is fun ... it looks like a kiddies fair ground ride going round and round!
I'll try and fit it tonight and report back.
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Oops, crossed mails, John.
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Well, seems to fit OK.? Could be a little wider and thicker.? I think the reason for the discrepancy is I measured the old tyre while it was on the wheel.? I stretched it off the wheel to use the calipers ... bit obvious in retrospect!  Pierre-Raymond, here's a view of the workings of the saw.? The blade is not fitted in the photos.  I did think around several ideas for making tyres.? If your printer isn't big enough to fit the whole tyre on the bed, this might be the way to go.? It's inspired by one of John's posts a while back (least I think it was John, if not please accept my apologies).? Part are fixed with super glue and I can't separate them with pensioner power. 
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I will step in for Julian if OK....
Thanks a lot John and Julian. Sounds clear for me now.
I'm currently seeking a small band saw for metal and I was confused
because the models I looked at don't have the tires you described. I
realize I was in the digital hobbyist group, not in a machinist
group as I thought ! However, Julian's reply might be of interest in
the future, I save both messages.
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Just been comparing the new tyre with the old and I have to say the old rubber or synthetic rubber tyre is far more grippy than the TPU version. Think I'll still press ahead with the second one but consider some sort of tread pattern perhaps.? Anyone any thoughts?
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Pierre-Raymond,
If its very small saws you are looking at with plastic wheels they are unlikely to use tyres.? However it would be most unusual to find a saw with metal wheels that doesn't have tyres.? If they are missing at least you now know a cheap way of making some!
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Yes, it's a small saw (~1300mm blade range )
Thanks for the tip. That's a prominent thing I need to look at,
especially if it's a second hand.
On 04.03.24 23:08, Julian via groups.io
wrote:
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Pierre-Raymond,
If its very small saws you are looking at with plastic wheels they
are unlikely to use tyres.? However it would be most unusual to
find a saw with metal wheels that doesn't have tyres.? If they are
missing at least you now know a cheap way of making some!
_._,_._,
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Pierre , typically most band saws except the 4x6
horizontal/vertical will have tyres on their wheels . Their just
not visible without removing the wheel covers .
animal
On 3/4/24 1:59 PM, Pierre-Raymond
Rondelle via groups.io wrote:
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Show quoted text
I will step in for Julian if OK....
Thanks a lot John and Julian. Sounds clear for me now.
I'm currently seeking a small band saw for metal and I was
confused because the models I looked at don't have the tires you
described. I realize I was in the digital hobbyist group, not in a
machinist group as I thought ! However, Julian's reply might be of
interest in the future, I save both messages.
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Neither my 4x6 or my 7x12 metal bandsaws have tires. ?My understanding is that metal bandsaws use a standard width blades where the teeth hang off the edge of the wheel. ?That way there is no damage to the wheel or to the teeth. ?With a wood bandsaw different width blades are used depending on the job. ?Narrow blades used when you want to cut tight curves will run with the teeth on the wheel and both the teeth and the wheel would be damaged without the rubber tire
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??? Huh, that's some pretty good info there .
thanks
animal
On 3/4/24 4:01 PM, John Walker via
groups.io wrote:
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Neither my 4x6 or my 7x12 metal bandsaws have tires. ?My
understanding is that metal bandsaws use a standard width blades
where the teeth hang off the edge of the wheel. ?That way there is
no damage to the wheel or to the teeth. ?With a wood bandsaw
different width blades are used depending on the job. ?Narrow
blades used when you want to cut tight curves will run with the
teeth on the wheel and both the teeth and the wheel would be
damaged without the rubber tire
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You could try scuffing the tyre with rough emery cloth for a better grip.
Just a thought.
--
John
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Julian
By coincidence this would have been my approach, the good old trusted "jig saw tenon.
It worked well when 3D printing that odd shaped box recently.
I am not proficient with Fusion but it is installed on my computer, so I can give it a go, thanks for the "how to" do it info.
My printer bed is 255 mm x 255 mm, so? I think I could print the tyre in 3 pieces and join together, maybe the 2 sets of tyres needed in one hit.
I can always print 1 piece again to a different length if I find my total circumference dimensions are wrong when assembling.?
Cheers
--
John
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John Lindo