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Thread: A question on blade life
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21st April 2020, 11:00 AM #1Intermediate Member
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A question on blade life
All
I am still very much in the learning phase with the wood working skills and machine setup and could use some advice.
How long is a reasonable expectation for a 1" 3TPI Bi-metal resaw blade to last. I fitted mine in Dec last year and it cracked almost to the point of snapping yesterday. The teeth are still catchy sharp, from factory, and it has done mostly softwood. The bulk of its use has come in the last month or so.
I have a BP355 (14") BS, the gullets were tracking just forward of the crown of the wheel and to deflect the blade approx 2mm the color would just be changing under my finger nail. When I am done with the saw I relax the tension off the blade.
I have cleaned the blade and had a look at it under a magnifier and cant see any other cracks at all.
Have I got my set up wrong?
Is the Bi-metal blade to stiff to be running on a 14" saw*
Did I just get the one that slipped through QC?
Thanks
*When looking for resaw blades I did consider a TC toothed blade but some of the info out there suggested that a 14" was to small and could cause the blade to crack.
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21st April 2020, 11:28 AM #2GOLD MEMBER
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the biggest question is where did it snap? At the weld location? If so, it's possible it was a weld defect, and you should possibly talk to the supplier and see what they think.
1". I was initially wondering if your saw could take a 25mm width, but according to the hafco specs they think it can run a 37mm, so you should be ok there.
Blades are consumables, so order a replacement pair if possible so you've always got a spare.....
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21st April 2020, 11:38 AM #3SENIOR MEMBER
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Much longer than what you've had it for, but depends on how hard you've been running it whether you've hit some nails along the way etc.
Normally i'd say a 14" bandsaw will struggle to get the required tension on a 1" blade, but given its a newer bandsaw it could very well have been tensioned too far.
Other things i'd look at is whether your guides are too close to the blade, this could cause it to overheat and weaken the blade.
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21st April 2020, 03:10 PM #4Intermediate Member
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Thanks guys
It didn't snap at the weld, I should have mentioned that originally and no nail strikes. The top guides (bearings) sit just off the blade when its running and with nothing being fed through. I do see one of them spin at times when cutting, always the same one, but not constantly. Seems to have more to do with my work holding and feed rate than anything else. Does seem to run on the lower thrust bearing but that is a little harder to check. The lower side bearings have been replaced with HDPE blocks, again running just off the blade. I have checked the blade temp immediately when finishing a cut, blade stopped of course, and it is only slightly warmer than the table. That's after a 1350mm long 220mm wide re-saw.
I bought the blade online from an Australian supplier. I wont say which one cause it could be my fault it has snapped and I don't want to bad mouth them with out cause. In every other respect the service there has been excellent. I found a local business to weld the blade and he is going to make up another couple of carbon steel blades as well.
I think I will use the saws down time to try and improve the dust collection some more.
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21st April 2020, 04:52 PM #5SENIOR MEMBER
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there are different grades of bimetal blades [2] I had them break after no time at all because the supplier was giving me there wrong grade of metal. Since I have changed supplier I haven't had any break at all and they last for along time with normal use.
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21st April 2020, 07:03 PM #6.
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I wouldn't trust the hafco specs - they just regurgitate what their manufacturers state which can be incorrect..
Before you waste your time re-welding it, here is a typical recommend blade size and thickness recommendations
From Choosing and Using Bandsaw Blades - The Tool Corner
If you are not meeting these specs I'd say you are asking for problems.
Screen Shot 2020-04-21 at 3.57.35 pm.png
Here is maximum blade thickness versus wheel radius.
Screen Shot 2020-04-21 at 3.57.51 pm.png
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