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Thread: My bandsaw is full of gremlins.
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19th April 2013, 07:42 PM #1Member
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My bandsaw is full of gremlins.
Hi all,
So I had a problem last year which the experts here were able to help me fix:
https://www.woodworkforums.com/f27/ba...n-help-154440/
But now I have another. This bandsaw has taken to breaking blades. A lot. In the last six months I've gone through maybe six blades...maybe more. What happens is, the blade will run fine for a while. The it will start going chung-chung-chung-chung-chung-BANG. Broken blade. Sometimes I get a few hours out of a blade, and I think the record for shortest time was about 10 minutes.
Suffice to say, it's getting extremely annoying. I've tried blades of different thicknesses with no effect. I've used blades from different suppliers and one of them was very highly recommended. So I don't think that's the problem. I'm pretty sure I'm not tightening the blade any more than usual either.
So, throwing to those with much more experience than I, does anyone have any profound insight? I'm beginning to loathe my bandsaw and considering scavenging the motor for a lamination grinder, and getting a different, gremlin free saw.
DaveArticles for beginning bowyers, Australian bowyers, and beginning Australian bowyers:
http://www.tharwavalleyforge.com/ind...shop/tutorials
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19th April 2013 07:42 PM # ADSGoogle Adsense Advertisement
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19th April 2013, 09:05 PM #2
Check the setting on your guides. They may be exerting pressure at some point. Aside from the wheels the guides are the only things in contact with the blade.
I'd probably losen everything off and start from scratch.Those were the droids I was looking for.
https://autoblastgates.com.au
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20th April 2013, 07:01 AM #3Senior Member
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- Apr 2004
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I had a blade break on me. What I found was that my blade tended to shift backwards slightly during cutting so it ran hard against the thrust guides, overheated at the weld joint in the blade and bust.
What I do now is check regularly for the shift and readjust the guides.
PaulNew Zealand
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20th April 2013, 08:22 AM #4GOLD MEMBER
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Hi,
I think this list covers most of the probable causes:
Why Band Saw Machines Break Band Saw BladesBandSawBlog
Work through the list snd let us know how you go!
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20th April 2013, 01:02 PM #5New Member
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This site is a wealth of information.Love it !!!!!!!!!!!!!
Kevin
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23rd April 2013, 07:26 AM #6
Have you tried different TPI and speed and feed rate?
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23rd April 2013, 07:50 AM #7Member
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Yeah I did. At least once, I heard the blade start to go chunk-chunk-chunk so I took the wood away and the blade broke with no wood on the teeth at all.
The rear bearing has a groove in it. About the width of a blade. I don't remember it being that way when I bought it so that might have something to do with it.Articles for beginning bowyers, Australian bowyers, and beginning Australian bowyers:
http://www.tharwavalleyforge.com/ind...shop/tutorials
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24th April 2013, 06:30 AM #8
By the way, what's the model/brand of your band saw?
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24th April 2013, 06:56 AM #9Member
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It's a carbatec, 1/2 hp, 10" saw.
I would like more saw but that's all I could afford at the time.Articles for beginning bowyers, Australian bowyers, and beginning Australian bowyers:
http://www.tharwavalleyforge.com/ind...shop/tutorials
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24th April 2013, 10:59 AM #10
That is not good. Does the thrust bearing spin freely? (From what you're saying I suspect it doesn't, but that it does have some movement...)
The thrust bearing should spin freely when the blade is pressed back against it (ie. when you're cutting) and if the blade falls into this slot it can jam, creating all sorts of problems. From serious tracking issues through to blade breakage.
Even if this is not the cause of your problem I heartily recommend that you replace it and save yourself some future head-aches.
- Andy Mc
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24th April 2013, 12:10 PM #11
Yes! what Skew said. Check also the opposing bearing, top or bottom. I suggest that you replace the back bearings and start your setup again. There is a problem with the tracking or tension or both!
IIRC this model has bolt on guides so also check that they have not shifted and are square to the blade.Russell (aka Mulgabill)
"It is as it is"
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25th April 2013, 08:27 AM #12
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25th April 2013, 08:40 AM #13Member
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It has done me great service so far, for the most part, and with care has cut wood many people said it would be incapable of.
Hopefully, with the expert assistance here, it can be returned to full service.Articles for beginning bowyers, Australian bowyers, and beginning Australian bowyers:
http://www.tharwavalleyforge.com/ind...shop/tutorials
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29th April 2013, 06:03 PM #14Member
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I took apart the upper and lower blade guide assemblies. Woe were they!
All six bearings were seized solid. The rear bearings, top and bottom, had grooves worn in them
So, a trip to the local bearing supply shop was the solution. "I'd like some more of these that spin, please" said I to the vendor. I replaced all the bearings with shiny new spinning ones.
So hopefully now the problem is licked. That one anyway. Now I'm wondering if perhaps the wheels need a balance to reduce some vibration. Unloaded, the blade has about a 1.5 mm total side to side vibration (I'm guessing) and maybe the same front to back. Not 1.5 mm left and 1.5 mm right, mind you. Problem is, I have no idea where to put the little weights to try to fix it.
Gremlins.Articles for beginning bowyers, Australian bowyers, and beginning Australian bowyers:
http://www.tharwavalleyforge.com/ind...shop/tutorials
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29th April 2013, 06:07 PM #15
Hey Yeoman, is there any side play in the wheel bearings??
CV Turner
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