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#1
Posted to uk.d-i-y
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Bandsaw blade breaking
I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used
it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT |
#2
Posted to uk.d-i-y
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Bandsaw blade breaking
"NT" wrote in message
... I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT Did it break at the weld? Is there a 'cleaning brush' in the blade path? Does the tensioner not have a spring? I spose having 3 wheels that they're small so the blade has to flex more often around a smaller radius than larger 2 wheel jobs. Roddy will be along shortly with the correct answer. |
#3
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Bandsaw blade breaking
On Apr 27, 7:55*pm, "brass monkey" wrote:
"NT" wrote in message .... I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT Did it break at the weld? I'll find out. Is there a 'cleaning brush' in the blade path? no, I wasnt using dust extraction either. My bad. Does the tensioner not have a spring? Yes. Theres also a clamping nut that, if not done up, lets the wheel wobble. I guess the solution is to do it up then back it off a tiny bit. I spose having 3 wheels that they're small so the blade has to flex more often around a smaller radius than larger 2 wheel jobs. Yes, they're famed for premature breakage - but not after 2 days of work. Roddy will be along shortly with the correct answer. heh NT |
#4
Posted to uk.d-i-y
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Bandsaw blade breaking
In message
, NT writes I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Inferior blade material with just the teeth induction hardened? Could the guides be misaligned leading to heating and softening of the blade back? I think you might hear or smell that. Have you been sawing knotty pine and the resin tacking dust to the blade and wheels? regards -- Tim Lamb |
#5
Posted to uk.d-i-y
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Bandsaw blade breaking
On 27/04/2012 19:06, NT wrote:
I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT Things that need setting: blade tracking, upper and lower blade guides, and rear bearings. Where they all set correctly? As BM said, a blade brush helps and is easy to add if you haven't got one fitted. |
#6
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Bandsaw blade breaking
On Apr 27, 8:57*pm, Tim Lamb wrote:
In message , NT writes I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Inferior blade material with just the teeth induction hardened? I may be wrong but I very much suspect the machine rather than the blade. It turned out to be in a grim condition. Could the guides be misaligned leading to heating and softening of the blade back? I think you might hear or smell that. It was all set up Have you been sawing knotty pine and the resin tacking dust to the blade and wheels? regards Wickes fence posts, I dont know what theyre made of, but the sawdust is stuck on pretty good, so I presume its resin. I'll use proper dust extraction in future. NT |
#7
Posted to uk.d-i-y
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Bandsaw blade breaking
On Apr 27, 8:59*pm, Nospam wrote:
On 27/04/2012 19:06, NT wrote: I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT Things that need setting: blade tracking, upper and lower blade guides, and rear bearings. Where they all set correctly? yes. I did run the saw for a bit with the top guides removed today to get that last little bit of height, but it broke later with the guides back on As BM said, a blade brush helps and is easy to add if you haven't got one fitted. Bit of steel bristled brush? NT |
#8
Posted to uk.d-i-y
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Bandsaw blade breaking
"NT" wrote in message ... On Apr 27, 8:59 pm, Nospam wrote: On 27/04/2012 19:06, NT wrote: I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT Things that need setting: blade tracking, upper and lower blade guides, and rear bearings. Where they all set correctly? yes. I did run the saw for a bit with the top guides removed today to get that last little bit of height, but it broke later with the guides back on As BM said, a blade brush helps and is easy to add if you haven't got one fitted. Bit of steel bristled brush? I think mine is brass. |
#9
Posted to uk.d-i-y
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Bandsaw blade breaking
"brass monkey" wrote in message b.com... "NT" wrote in message ... On Apr 27, 8:59 pm, Nospam wrote: On 27/04/2012 19:06, NT wrote: I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT Things that need setting: blade tracking, upper and lower blade guides, and rear bearings. Where they all set correctly? yes. I did run the saw for a bit with the top guides removed today to get that last little bit of height, but it broke later with the guides back on As BM said, a blade brush helps and is easy to add if you haven't got one fitted. Bit of steel bristled brush? I think mine is brass. Or maybe nylon, can't remember. |
#10
Posted to uk.d-i-y
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Bandsaw blade breaking
On Apr 27, 7:06*pm, NT wrote:
I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT The likely cause is insufficient tension. (Allows the blade to flex too much) |
#11
Posted to uk.d-i-y
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Bandsaw blade breaking
On Apr 28, 7:41*am, harry wrote:
On Apr 27, 7:06*pm, NT wrote: I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT The likely cause is insufficient tension. * (Allows the blade to flex too much) good question: how do I know when tension is correct? NT |
#12
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Bandsaw blade breaking
In message
, NT writes On Apr 28, 7:41*am, harry wrote: On Apr 27, 7:06*pm, NT wrote: I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT The likely cause is insufficient tension. * (Allows the blade to flex too much) good question: how do I know when tension is correct? Mine has a sprung marker. However, I never release the tension or bother checking:-) regards -- Tim Lamb |
#13
Posted to uk.d-i-y
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Bandsaw blade breaking
On 27/04/2012 22:48, NT wrote:
On Apr 27, 8:59 pm, wrote: On 27/04/2012 19:06, NT wrote: I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT Things that need setting: blade tracking, upper and lower blade guides, and rear bearings. Where they all set correctly? yes. I did run the saw for a bit with the top guides removed today to get that last little bit of height, but it broke later with the guides back on As BM said, a blade brush helps and is easy to add if you haven't got one fitted. Bit of steel bristled brush? NT Try a paint brush head - mine has lasted many years |
#14
Posted to uk.d-i-y
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Bandsaw blade breaking
On Apr 28, 9:30*am, Nospam wrote:
On 27/04/2012 22:48, NT wrote: On Apr 27, 8:59 pm, *wrote: On 27/04/2012 19:06, NT wrote: I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today.. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT Things that need setting: blade tracking, upper and lower blade guides, and rear bearings. Where they all set correctly? yes. I did run the saw for a bit with the top guides removed today to get that last little bit of height, but it broke later with the guides back on As BM said, a blade brush helps and is easy to add if you haven't got one fitted. Bit of steel bristled brush? NT Try a paint brush head - mine has lasted many years That wouldnt have a hope in hell of removing what's stuck on there. Brass should be able to pull a little bit off at each pass, I'll look for a brass brush of some sort later. cheers NT |
#15
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Bandsaw blade breaking
On Sat, 28 Apr 2012 13:12:21 -0700 (PDT), NT wrote:
As BM said, a blade brush helps and is easy to add if you haven't got one fitted. Bit of steel bristled brush? Try a paint brush head - mine has lasted many years That wouldnt have a hope in hell of removing what's stuck on there. I don't know but wouldn't the brush remove the dust before it gets compressed onto the blade by the rollers? What you are cutting will make a difference, a resiny bit of softwood will bung up any saw blade... Brass should be able to pull a little bit off at each pass, I'll look for a brass brush of some sort later. I'd have thought stuff that is already stuck on needs to be removed manually rather than hopefully brushed off. -- Cheers Dave. |
#16
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Bandsaw blade breaking
On Apr 30, 10:55*am, "Dave Liquorice"
wrote: On Sat, 28 Apr 2012 13:12:21 -0700 (PDT), NT wrote: As BM said, a blade brush helps and is easy to add if you haven't got one fitted. Bit of steel bristled brush? Try a paint brush head - mine has lasted many years That wouldnt have a hope in hell of removing what's stuck on there. I don't know but wouldn't the brush remove the dust before it gets compressed onto the blade by the rollers? What you are cutting will make a difference, a resiny bit of softwood will bung up any saw blade... Brass should be able to pull a little bit off at each pass, I'll look for a brass brush of some sort later. I'd have thought stuff that is already stuck on needs to be removed manually rather than hopefully brushed off. I get the feeling people are underestimating how sticky this is. It seems I've got a problematic piece of wood, won't use it in future. To finish this project I'll use dust extraction and clean the saw out after each cut. Yes, it will need it, it only took one cut of a foot or so to clog the blade so much it broke. NT |
#17
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Bandsaw blade breaking
On 30/04/2012 11:14, NT wrote:
On Apr 30, 10:55 am, "Dave Liquorice" wrote: On Sat, 28 Apr 2012 13:12:21 -0700 (PDT), NT wrote: As BM said, a blade brush helps and is easy to add if you haven't got one fitted. Bit of steel bristled brush? Try a paint brush head - mine has lasted many years That wouldnt have a hope in hell of removing what's stuck on there. I don't know but wouldn't the brush remove the dust before it gets compressed onto the blade by the rollers? What you are cutting will make a difference, a resiny bit of softwood will bung up any saw blade... Brass should be able to pull a little bit off at each pass, I'll look for a brass brush of some sort later. I'd have thought stuff that is already stuck on needs to be removed manually rather than hopefully brushed off. I get the feeling people are underestimating how sticky this is. It seems I've got a problematic piece of wood, won't use it in future. To finish this project I'll use dust extraction and clean the saw out after each cut. Yes, it will need it, it only took one cut of a foot or so to clog the blade so much it broke. NT The brush is to prevent build-up, not to remove it. If you're not using one already, switch to a skip-tooth blade. If it's a 3-wheel bandsaw the wheels may be smallish so make sure you choose a sensible blade thickness for the wheel diameter - loads of info on-line but have a look here for a starter: http://www.toolcenter.com/BLADE_SELECTION.html (I assume that you fixed the tyre problem you mentioned earlier, and that the blade was tracked correctly) |
#18
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Bandsaw blade breaking
On Mon, 30 Apr 2012 03:14:51 -0700 (PDT), NT wrote:
I'd have thought stuff that is already stuck on needs to be removed manually rather than hopefully brushed off. I get the feeling people are underestimating how sticky this is. Softwood resin is very sticky stuff even worse when it gets warm or hot. That's why I suggest manually removal of anything already there, brushes will help prevent the build up. Note, "help prevent" not "stop"... Yes, it will need it, it only took one cut of a foot or so to clog the blade so much it broke. A rip rather than crosscut cut then? Rip saws have a different tooth profile and cutting action compared to crosscut ones, certainly for hand saws. I can't see that a band saw should be any different. IIRC a rip saw is like a lot of inline chisels. A crosscut two lines of inline knives. http://www.vintagesaws.com/library/primer/sharp.html Nice illustrations and explanations about 1/4 way down. -- Cheers Dave. |
#19
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Bandsaw blade breaking
On Apr 30, 12:09*pm, Nospam wrote:
On 30/04/2012 11:14, NT wrote: On Apr 30, 10:55 am, "Dave Liquorice" *wrote: On Sat, 28 Apr 2012 13:12:21 -0700 (PDT), NT wrote: As BM said, a blade brush helps and is easy to add if you haven't got one fitted. Bit of steel bristled brush? Try a paint brush head - mine has lasted many years That wouldnt have a hope in hell of removing what's stuck on there. I don't know but wouldn't the brush remove the dust before it gets compressed onto the blade by the rollers? What you are cutting will make a difference, a resiny bit of softwood will bung up any saw blade... Brass should be able to pull a little bit off at each pass, I'll look for a brass brush of some sort later. I'd have thought stuff that is already stuck on needs to be removed manually rather than hopefully brushed off. I get the feeling people are underestimating how sticky this is. It seems I've got a problematic piece of wood, won't use it in future. To finish this project I'll use dust extraction and clean the saw out after each cut. Yes, it will need it, it only took one cut of a foot or so to clog the blade so much it broke. NT The brush is to prevent build-up, not to remove it. I fitted a brush under the table today, it does seem to help. If you're not using one already, switch to a skip-tooth blade. Done. If it's a 3-wheel bandsaw the wheels may be smallish so make sure you choose a sensible blade thickness for the wheel diameter - loads of info on-line but have a look here for a starter:http://www.toolcenter.com/BLADE_SELECTION.html Yes, using 0.014" blades suited to 6" wheels. (I assume that you fixed the tyre problem you mentioned earlier, and that the blade was tracked correctly) I recrowned the wheels, didn't fit tyres, and shimmed the mounting to sort out the tracking.The 6tpi blade worked nicely, until it snapped. I think the problem there was either muck buildup plus the tension spring being clamped, or perhaps a blade fault, it split on the weld. Today I used a new unbranded 10tpi that came with the saw, and its cutting askew and leading. I'll get more of the 6 skip tooths. I'm hoping it'll now work ok, as its set up right. I'll just have to see how it goes. Thanks to everyone for the suggestions. NT |
#20
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Bandsaw blade breaking
On Apr 28, 8:46*am, Tim Lamb wrote:
In message , NT writes On Apr 28, 7:41*am, harry wrote: On Apr 27, 7:06*pm, NT wrote: I fitted a nice new 6tpi bandsaw blade, it cut very happily, only used it for 2 days, always been gentle with it, and the bugger broke today. I noticed 2 things I wasnt expecting: 1 the blade is curved, it looks like the back has stretched, as if it had been pushed hard, but I've been totally gentle with it. 2 the blade and 2 of the 3 saw wheels were covered with firmly adhered clumps of sawdust. I presume its down to the sawdust effectively enlarging the wheels and extending the blade path. Add to this that the tension adjustment is bolted tight and I presume thats what broke it. Are there any other possibilities? I'd rather check things now than after more blades. Thanks, NT The likely cause is insufficient tension. * (Allows the blade to flex too much) good question: how do I know when tension is correct? Mine has a sprung marker. However, I never release the tension or bother checking:-) regards This is the one thing I must still figure out. NT |
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