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-   -   Wavy bandsaw-cut (https://www.woodworkingtalk.com/f12/wavy-bandsaw-cut-65720/)

Johanness 10-01-2014 09:57 AM

Wavy bandsaw-cut
1 Attachment(s)
Got an old bandsaw from the internet into my garage. Bought a blade and began to saw. It worked fine in the beginning but after a few cuts it started to make a wavy mark on the wood, see the picture. Does anybody knows whats wrong and how to fix it?

woodnthings 10-01-2014 10:12 AM

more info needed
What brand of saw?
What brand and size of blade...number of teeth per inch and width?
What type of guides.... blocks or bearings?
What type of wood...looks like Maple?
What size is the motor.... 1/2 HP or more?
How fast are you feeding the wood ....slow and easy letting the blade do the work or is some force needed?
How tight is the blade on the wheels?
Can you easily move the blade over with a light touch in the center more than 1/4"?

Looks like a bad blade with not enough tension ....just an off hand guess. :blink:

Johanness 10-01-2014 10:45 AM

Ah, sorry.. Im quite new to woodworking so..
I dont know the brand but the blade is a 10mm with 6 tpi. Block guides and its pinewood. It doesnt matter if i feed slow or fast, the same marks appear. I think it might be the tension because ive tension it to the max but its still kind of loose

TimPa 10-01-2014 12:18 PM

you're right, the tension is one place to look - make sure it is working properly. check for the correct blade length, if it is too long you will not be able to tension it. soem blades are beter than others, especially where the weld is, causing a jump to occur at that point as it goes around.

i recommend that you get the manual for it and maybe a new decent blade for starters. go through the manual and do all of the adjustments.

PhilBa 10-01-2014 01:13 PM

Mr Broken Record here. Watch Alex Snodgrass's Bandsaw Clinic Video. The first 15 minutes will tell you what you need to get your BS working great. Before I watched it, band saws were kind of mystery to me but they are pretty simple machines and really easy to tune up.

Your problem is probably one of wrong tension, dull blade or mis-adjusted thrust bearings.

difalkner 10-01-2014 02:09 PM

1 Attachment(s)
Just from the photo it doesn't look wavy, rather it looks like you're cutting Curly Maple. What kind of wood is that? Because if it's Curly Maple it's suppose to look like that. But if it is actually wavy then yes, setup of the bandsaw is where you need to go to correct.

Curly Maple -
Attachment 100040

PhilBa 10-01-2014 04:40 PM

the op said it was pine. If you look closely at the edge, you can see the waves. My money is on the thrust bearing being too far forward.

difalkner 10-01-2014 05:21 PM


Originally Posted by PhilBa (Post 636053)
the op said it was pine. If you look closely at the edge, you can see the waves. My money is on the thrust bearing being too far forward.

Yes sir, saw that. Also saw 'new to woodworking'.

woodnthings 10-01-2014 07:47 PM

I would also question blade speed
A bandsaw off the internet is an unknown as far as what the RPMS are, what motor speed and what blade speed is.......

It may also be a bad weld in the blade where the blade is a bit offset and causing a "skip" pattern. Gotta be somethin' simple. :yes:

gus1962 10-02-2014 04:33 PM

It could be dull/ low quality band saw blade, too fast or slow feeding, over or under tensioned blade , misaligned
guides. Watch the video, that would surely help you.

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