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Posted on Oscillating Flutter?? Grizzly G0513ANV 17" Bandsaw

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Stowerscw

25 posts in 983 days


#1 posted 04-18-2018 12:57 AM

Firstly, thanks for your detailed response to my problem.

So, I didn’t see any movement in the wheels while turning the machine on and off. I did measure the misalignment of the wheels vertically to be off by about 1/32”. Any idea if that should be enough to make a difference?

The blade is nearly in the same position on both wheel but not perfect. If the blade is tracking in the center on the top wheel the blade is slightly off center on the bottom, by maybe 1/8”.

to your 2nd check point: I did see a very slight wave in the lower tire when I checked it with a pencil to trueness. I put a small screw driving under the tire and moved it around the wheel a few times to try and distribute the tire a little more. I’m not sure if it helped or not. The wave in the tire was so small it was hard to tell a difference.

After putting the blade back on and trying to get the blade to be tracking in the same place on both lower and upper wheels I noticed that it stopped oscillating! I hope that it stays this way but I’m not going to hold my breath just yet. I’ll try running a few test pieces through it and see what happens then.

I’m also not sure I like the euro style guides that came on it. Those things seem to rattle into the blade and make a lot of noise. I’m debating on ordering some bearing guides for it but I’ve heard some people say its not worth the upgrade.

Thanks again for your comment. I’ll post back when I can say for sure that its solved.

Edit: 18 min later
I jumped the gun I guess. The oscillation is still there possibly just not as bad. Should the upper wheel alignment knob be that finicky? It seems like I can tune that thing just right and the flutter will go away but some back half an hour later and its fluttering again.

Something else I forgot to mention is that when I turn the saw off the blade flutters like crazy. Is this normal?


More tension makes it worse = problem.

My 1st guess is upper/lower wheel misalignment?
My 2nd guess is bent wheel, or tire issue?

Have no experience with Grizzly 17”, but have seen blade flutter issues on both a Delta clone 14” and vintage 20” band saw? Even after installing new urethane tires, and balancing the wheels (which helped some); real culprit ended up being misalignment between upper and lower wheels. They need to be in same vertical plane to each other, or tension stress creates sort a figure 8 oscillation in wheel position.

It is easy to check:
Open covers and watch wheels/tires with motor running: not looking for vibration, look for movement: they should not have any major out of plane movement under power. IE. almost no side to side or in/out movement. Blade should in about same position on both wheels also.

If you see movement:
1st check for bent wheel: remove blade, spin wheels while holding pencil in fixed position against the side (maybe use dust brush as pencil rest): is the wheel running true or is there a wobble?
Wobble? – Call Grizzy and discuss problem; likely need a new wheel or new bearing.

2nd check condition of tires.
Should be centered on wheel, no flat spots in circumference, no lumps with smooth surface, maybe slight crown in middle (helps tracking) or dead flat side to side.

3rd check for upper/lower wheel alignment:
Aligning wheels is not hard, but can be a pain; as you typically have to tear saw down pretty far to use straight edge. That or you need to make some custom co-planar gauge blocks. Most of the newer band saw manuals I have seen show how to align wheels.

Best Luck.

- CaptainKlutz



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