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Bandsaw blade jumping

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Forum topic by totalrewind posted 04-18-2014 03:58 PM 1200 views 0 times favorited 9 replies Add to Favorites Watch
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totalrewind

23 posts in 1903 days


04-18-2014 03:58 PM

Topic tags/keywords: question bandsaw

My bandsaw has taken on a strange issue. As it runs, the blade periodically jumps forward in the direction of the teeth. I’d say about every half second or so. Apart from making a raket it also is really hard to cut with, and I’m concerned there are only about five teeth actually doing any cutting.

What’s weird is I really don’t see anything out of alignment. All the guide bearings look rightt, blade is tracking on the wheels straight. Don’t feel excessive crud build-up on the wheels.

I just don’t know what else to try. Everything seems according to the book, but the problem remains.

Any ideas?


9 replies so far

View MrRon's profile

MrRon

4073 posts in 2874 days


#1 posted 04-18-2014 04:11 PM

Sounds like the blade was not welded correctly. The two ends of the blade at the joint are not aligned. If it is indeed the blade, it will cause damage to the guides.

View mikeevens45's profile

mikeevens45

68 posts in 1206 days


#2 posted 04-18-2014 04:11 PM

blade kinked? roll blade around by hand and look at the side view…or rear guide bearing is locking up

-- as technology progresses, wood workers seem to regress...all my power tools and my favorite is a chisel and a hand plane

View distrbd's profile

distrbd

2246 posts in 2077 days


#3 posted 04-18-2014 04:17 PM

Kinked blade +1,unless it’s a new blade you just put on ,if so Mr Ron is right,there’s no mystery with bandsaw most of the time.
change the blade .

-- Ken from Ontario, Canada

View Surfside's profile

Surfside

3389 posts in 1804 days


#4 posted 04-18-2014 08:53 PM

Missing tooth ? Get a replacement.

-- "someone has to be wounded for others to be saved, someone has to sacrifice for others to feel happiness, someone has to die so others could live"

View johnstoneb's profile

johnstoneb

2415 posts in 1803 days


#5 posted 04-18-2014 10:47 PM

x1 MrRon Sound like a problem with the weld. Change the blade.

-- Bruce, Boise, ID

View teejk's profile

teejk

1215 posts in 2315 days


#6 posted 04-18-2014 11:00 PM

OP didn’t say what size blade he was using. I think some of the wider blades are designed to do exactly what he is describing (e.g. I experience it when I use a 3/4” blade for resawing). I think the goal is to widen the kerf and give a little longer life to the blade. For finer work, I switch to a 3/8” or 1/4” blade and I don’t notice it there at all. I’m not a bandsaw expert at all, just relating my personal observations.

View totalrewind's profile

totalrewind

23 posts in 1903 days


#7 posted 04-21-2014 04:59 PM

@teejk – nothing fancy, just a regular 3/8 blade.

Several people nailed it though. I took the blade off and inspected it closer. There was a crack about 2/3 the way through. No doubt it would’ve popped soon.

View mramseyISU's profile

mramseyISU

493 posts in 1176 days


#8 posted 04-21-2014 09:13 PM

I was just going to say it sounds like a cracked band right before it breaks.

-- Trust me I'm an engineer.

View johnstoneb's profile

johnstoneb

2415 posts in 1803 days


#9 posted 04-22-2014 12:56 PM

teejk If you are experiencing the same problem you either have a bad or poor weld. the set in the teeth is there to give a wider kerf and clearance for the rest of the blade. With a good blade and proper weld you might here a little tick when the blade goes by the guides but that is all.

-- Bruce, Boise, ID

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