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Author Topic: Wavy Cuts  (Read 9339 times)

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Offline woodman58

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Wavy Cuts
« on: September 03, 2010, 08:41:22 AM »
 I have a guy that saws for me on occation. He has a Woodmizer LT40. The last few times he cut for me the cuts have been very wavy. What can I tell him to do to fix this problem with out insulting him. He has been cutting for 15 years.
The other person that cuts for me has a Baker 3665. The cuts are always true. He is moving futher away in 2 months and semi retiring, so I'm going to have to use the other guy. Thanks
i LOVE THE SMELL OF SAW DUST IN THE MORNING.
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Offline Burlkraft

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Re: Wavy Cuts
« Reply #1 on: September 03, 2010, 09:01:23 AM »
Boards like that turn your planer into a skip planer  ;D  ;D  ;D
Why not just 1 pain free day?

Offline ronwood

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Re: Wavy Cuts
« Reply #2 on: September 03, 2010, 09:16:50 AM »
woodman58,

Sounds like he is trying to cut to fast and using blades that are dull. Could be a issue with the mill also. Has he always cut wavy lumber.

Ron
Sawing part time mostly urban logs -St. Louis/Warrenton, Mo.
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Offline John Bartley

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Re: Wavy Cuts
« Reply #3 on: September 03, 2010, 10:49:22 AM »
My experience is this:

1 - bands that are dull but properly set for the type of wood, will cut slowly and will load the engine down. They also seem to gather the most dust and pitch.

2 - bands that are under-set for the type of wood they are cutting, will almost always produce a wavy cut, regardless how sharp they are.

3 - bands that are over-set will produce more sawdust then is necessary, but if they are sharp, they will cut just as well as a properly set and sharpened band.

that's all I got...

John
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Offline Bro. Noble

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Re: Wavy Cuts
« Reply #4 on: September 03, 2010, 11:03:01 AM »
In addition to John's list,  a dull blade runs warm and picks up sap from the wood.  If you don't run enough water, the sap buildup has the effect of removing set, causing wavy cuts.

I feel my blade for warming (not while it's running ::)) and start thinking about changing it when it begins to feel warm.
milking and logging and sawing and milking

Offline dkyle

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Re: Wavy Cuts
« Reply #5 on: September 03, 2010, 12:02:48 PM »
what do you mean by "over-set", "under-set"?
I suspect the guy is running the blade too long.. it is dull, and running hotter than it should.  It expands and is now running is looser.

Offline woodman58

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Re: Wavy Cuts
« Reply #6 on: September 03, 2010, 02:15:23 PM »
One thing I forgot to mention is that he does not run water on the blade. His hose is broken. He says it works fine without it.
i LOVE THE SMELL OF SAW DUST IN THE MORNING.
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Offline weisyboy

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Re: Wavy Cuts
« Reply #7 on: September 03, 2010, 04:35:08 PM »
dosent sound like it works fine to me.

Offline paul case

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Re: Wavy Cuts
« Reply #8 on: September 03, 2010, 04:45:50 PM »
dosent sound like it works fine to me.
i  almost said that, thanks for posting it so i didnt have to.
my exp.  dull blade  pushing to fast. no lube can do it too if the sap builds up on the blade like noble said.   pc
life is too short to be too serious. (some idiot)
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pc

Offline Tom Sawyer

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Re: Wavy Cuts
« Reply #9 on: September 03, 2010, 05:07:39 PM »
One other factor would be the kind of wood he is cutting.  Spruce will sometimes give me fits no matter how sharp or well set my blades are.  I always make sure the customer knows that wavy wood is not acceptable to me as the sawyer, and on the one occasion that I couldn't cut a customer's spruce straight no matter how hard I tried, his bill was discounted significantly. 

Amen to weisyboy and Paul Case.

Tom

Offline backwoods sawyer

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Re: Wavy Cuts
« Reply #10 on: September 03, 2010, 08:30:47 PM »
The saw tracking to far back on the wheel will take the set right out of a new saw.
Worn guides will not hold the blade flat in the cut.
Not having enough tension on the saw will allow the saw to wander.
Get the water flowing even if that mean using a garden hose on the saw or the sawyer. :-X
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Offline Magicman

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Re: Wavy Cuts
« Reply #11 on: September 03, 2010, 09:15:26 PM »
"Folks" that saw wavy lumber are good for my business.  Their former customers are my future customers.  Notice that I didn't call him a "sawyer".

He has a sawmill and saws logs, but a sawmill don't a sawyer make.
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Never allow your "need" to make money to exceed your "desire" to provide quality service.....The Magicman

Offline tazz

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Re: Wavy Cuts
« Reply #12 on: September 03, 2010, 09:49:28 PM »
One thing I forgot to mention is that he does not run water on the blade. His hose is broken. He says it works fine without it.


I have noticed everytime I let my water tank run empty my cuts get wavy, even with a new blade on. You should let him know, this could cause him to lose a lot of business. I know if it were me I would want to know.

Offline sgschwend

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Re: Wavy Cuts
« Reply #13 on: September 04, 2010, 12:08:21 AM »
Wavy where?  At the beginning of the cut, around the knots, on the edges of the board, only on the large knots, or anywhere on the board?

All of those places have their own cause and effect.


Offline John Bartley

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Re: Wavy Cuts
« Reply #14 on: September 04, 2010, 05:17:28 AM »
what do you mean by "over-set", "under-set"?

When a band is made, the teeth tips are alternately bent left and right so that the band cuts wider than the thickness of the band material. This is called the "set" of the tooth. On the bands that I use the set pattern is Left - Right - None, so every third tooth tip is bent (set) the same way. When a tooth tip is bent too far (over-set), the kerf in the cant is wider than it needs to be and extra energy and wood are wasted making sawdust that could be a board. When a tooth tip is not bent over far enough (under-set), the result is often a wavy cut accompanied by a band that runs warm and builds up pitch.

FYI : I'm no expert.....not even close to being one......this is just my experience so far.

cheers

John
Kioti DK35HSE w/loader & forks
Champion 25hp band mill, 20' bed
Stihl MS361
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Offline gator gar

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Re: Wavy Cuts
« Reply #15 on: September 04, 2010, 05:34:28 AM »
If he has been cutting for 15 years, he has it figured out by now. My opinion is that he just don't care and has little or no pride in his work. I'd find another person to saw for me in the future.

Offline bandmiller2

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Re: Wavy Cuts
« Reply #16 on: September 04, 2010, 07:16:21 AM »
Woodman,perfect excuse to get your own mill.Frank C.
A man armed with common sense is packing a big piece

Offline ladylake

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Re: Wavy Cuts
« Reply #17 on: September 04, 2010, 07:44:45 AM »
  We all get a wavy cut once in a while but should not get 2 in a row.   Steve
Timberking B20 14000 hours +  Case75xt grapple + forks+8" snow bucket + dirt bucket   770 Oliver   Lots(too many) of chainsaws, Like the Echo saws and the Stihl and Husky     W5  Case loader   1  trailers  Wright sharpener     Suffolk  setter Volvo MCT125c skid loader

Offline barbender

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Re: Wavy Cuts
« Reply #18 on: September 04, 2010, 10:08:59 AM »
If he's been doing this for 15 years and is sawing a large amount of wavy lumber, either he doesn't care about quality, or he doesn't know what he is doing. I'd say an occasional wavy cut is to be expected, but the situation should be fixed right away. Bottom line- I'd find someone else. ;)
Too many irons in the fire

Offline Chuck White

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Re: Wavy Cuts
« Reply #19 on: September 04, 2010, 10:28:53 AM »
Other than mill alignment, wavy cuts are caused by:
Dull blade.
Not enough lube (pitch build-up).
The set doesn't match the wood being cut.
Pushing a dull blade too hard/fast.

My money says that the other guy doesn't sharpen his own blades and/or have a good resharp service.

I found that once I got my own Sharpening/Setting equipment, I pull the blades off the mill at first sign of a wave or the engine laboring.

"Folks" that saw wavy lumber are good for my business.  Their former customers are my future customers.  Notice that I didn't call him a "sawyer".

He has a sawmill and saws logs, but a sawmill don't a sawyer make.

I have quite a few of those too Magicman.  ;D
~Chuck~
Retired USAF (1989), Retired School Bus Driver (2012), and now a Mobile Sawyer
1995 Wood-Mizer LT40HDG2425 Kohler - Shingle & LapSider, Cooks Cat Claw Sharpener and single-tooth setter, 4-foot Logrite cant hook.
Basic mechanical skills are all that's required to maintain a Wood-Mizer


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