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Author Topic: Saw wobble  (Read 5525 times)

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Offline CX3

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Saw wobble
« on: February 05, 2016, 08:20:07 PM »
Guys I am having a time getting my saw to fly straight. It leads in bad about the third log. Teeth are good. Guides good. Lead is good. When it comes out of the log it is pulled in so hard it literally wobbles. Then of course it is warm and won't settle down for awhile. I feel like I have tried everything. ??? Besides having it hammered
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Offline beenthere

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Re: Saw wobble
« Reply #1 on: February 05, 2016, 08:40:42 PM »
"All" is not good.. need to find out what it is that "isn't good". 

Maybe you have this document... if not, it is a good read.

http://www.fpl.fs.fed.us/documnts/misc/circsaw.pdf

What mill do you have?
south central Wisconsin
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Offline CX3

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Re: Saw wobble
« Reply #2 on: February 05, 2016, 09:42:52 PM »
Yes I have that thanks.

My mill is a JA Vance handset 3 headlock. Cummins power. 52 in saw.
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Offline ETSawyer

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Re: Saw wobble
« Reply #3 on: February 06, 2016, 02:15:12 AM »
I would start by checking the teeth in the saw against new ones. Make sure your angle is correct and the teeth are not too narrow and that the tooth is square not filed leading the saw in or your log side is not wider that the board side of the tooth. Side clearance issues can make a saw do alot of strange things. Was the saw hammered recently?  If the saw is a known good and the bits are good I would look deeper into the husk. Sounds like if everything else checks out it could be lead or collars. Also where is the saw heating up  around the eye near the collars or on the rim near the guides? 
Some of the more knowledgable circular saw guys will chime in I'm sure but this info will help to narrow down where your problem may lie.  Hopefully this helps and good luck!

Offline Ron Wenrich

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Re: Saw wobble
« Reply #4 on: February 06, 2016, 06:04:00 AM »
When was the last time the saw was hammered?  I had a saw that was cracked that gave me fits.  I assume you haven't changed shanks lately.  If you are sure it is okay and the teeth are new, that should take care of the issues of the saw. 

Next thing is to make sure the rpm is where it is supposed to be.  If you run too slow or too fast for the hammered speed, you can get wobble.  When you saw, are you maintaining those rpms through the cut?  Feeding too fast will slow your saw, and it will lay over.  Rpm can drop if the belts aren't tight enough.

How cold is it in your area?  You may be running frozen logs or half frozen ones.  Half frozen is the worst, since you're sawing 2 different types of wood in one cut.  If you're gullets aren't up to snuff, you can get spillage and sawdust will freeze to the sides of the log.  That usually pushes the saw out of the cut. 

Lead can be tricky, especially this time of year.  Although you say lead is good, I have never been able to say that a certain amount of lead is optimum for every saw and every situation.  With frozen logs, you need less lead.  If you swap saws, you may need to adjust lead.  I'd try to dial back the lead to see if that makes any difference. 

We had one a few months ago, here on the forum, where we couldn't figure out why a saw had wobble.  Turned out that the front bearing holder was loose on the husk.  Make sure they are solid.  Do you have 2 or 3 bearings?  If you have 3, then make sure you loosen the middle bearing when you adjust your lead.  Tighten it last.  If you don't, you'll put spring in your mandrel. 

Then, you have your collars.  How tight do you make your saw nut?  You shouldn't be putting too much pressure on it, or you'll smash your collars.  When mounting the saw, you should pull back the saw on the shear pins (you did check those?), then tighten the nut.  I always got mine tight, then kicked it twice to get it snug.  That's tight enough. 

You can also check your collars with a flat edge to see if they're within tolerance.  Another check for mandrel and collars is to check how the saw is running between your guides.  It shouldn't be moving back and forth.  Take your saw and put it where it is in the middle of your guides.  Take a crayon or marker and make an "o" on that tooth.  You're going to map out your saw.  As you advance to each tooth, you will mark either an "o" for center, a "+" as it moves to one side, or a "-" as it moves to the opposite side.  The more it moves, add a + or -.  When you're done, you'll be able to see which side is high and which is low.  Now you have to figure out if it's the collars or the mandrel.

Take the loose collar and turn it 180.  If nothing changed, it's probably not that collar.  Rotate the saw 180, if nothing changed its probably not the fast collar or the mandrel.  Its probably in the saw and it needs hammered.  Old timers will tell you that you can use a paper shim to bring your saw back into balance.  Its not optimum, but I've used it on old mills.

After that, you have to start looking if you're getting any movement in the carriage.  Track needs to be straight and level.  Carriage trucks can't have much play in them.  Your headblocks can't be sloppy.  You also want to look at your board splitter.  If that is moved too far beyond the saw, you'll be pushing against your log as you're feeding past it.  You'll be able to see that when you gig back.  If you move your log beyond the splitter, then gig back, your log shouldn't be hitting the splitter. 

I think that covers about everything that could be wrong.  I often had problems with winter sawing, and dreaded it on logs that had been laying on the ground. 
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Offline dgdrls

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Re: Saw wobble
« Reply #5 on: February 06, 2016, 01:00:57 PM »
Guys I am having a time getting my saw to fly straight. It leads in bad about the third log. Teeth are good. Guides good. Lead is good. When it comes out of the log it is pulled in so hard it literally wobbles. Then of course it is warm and won't settle down for awhile. I feel like I have tried everything. ??? Besides having it hammered

The first and second log saw OK?  Is the blade already getting too warm by then??
Where is it getting warm,  in the eye or on the rim?

As others have pointed out check the teeth and be certain they are  true and square
as well as the shanks, 

Dan

Offline CX3

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Re: Saw wobble
« Reply #6 on: February 06, 2016, 02:47:12 PM »
Ok thanks for the replies. I had a guy come over and check my sharpening job (novice) he sharpened the teeth square. Same thing happened when sawing.

I have a meeting Sunday morning with the head sawyer at another mil . He is going to hang my saw on his mill and check my saw.

I am certain it has to be the saw. I have checked and triple checked all other possibilities. I have literally went mad setting my track level and sturdy. I have it blocked up just like the pamphlet says. 4 ft cross ties every 6 ft. It doesn't wiggle.

Hopefully this guy can line out my saw.
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Offline Gearbox

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Re: Saw wobble
« Reply #7 on: February 06, 2016, 07:43:50 PM »
Did the mill saw good and then go bad ? Saw speed if to slow will cause wobble . does the saw stand up befor the first cut ? Are you checking lead on only one tooth and turning the saw with the guides backed out ?
A bunch of chainsaws a BT6870 processer , TC 5 International track skidder and not near enough time

Offline CX3

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Re: Saw wobble
« Reply #8 on: February 07, 2016, 03:01:57 PM »
Yes gearbox I was checking lead on the first headblock, and with the same tooth.

I called the local mill where I sell my good logs lol, and the head sawyer came over this morning before church. A few whacks with a 2 lb hammer and my saw was standing up good. He said it was dished toward the log. Soooo sinful me couldn't stop thinking about my saw while sitting in church....and just got done sawing a log and man he worked magic on this thing. What a great deal. Problem solved, and now I know what to look for when my saw gets warm. He said he'd help me anytime and told me after a few times I could hammer my own saw hanging on the mandrel. He said he hasn't had a saw hammered off the mandrel by someone else in 20 yrs. I am fortunate to be learning from this guy.
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Offline CX3

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Re: Saw wobble
« Reply #9 on: February 07, 2016, 03:04:33 PM »
And I was also watching saw speed very carefully while in the cut, I have a tachometer on the power unit. I am going to move it closer to me so I can watch it without turning my head. Thanks for all the inputs guys, I have learned alot this week
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Offline Ron Wenrich

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Re: Saw wobble
« Reply #10 on: February 07, 2016, 03:50:01 PM »
Nothing like a good mentor.  If you listen to your saw, it will act as good as any tach.  Keep the same pitch all the way through the cut.
Never under estimate the power of stupid people in large groups.

Offline CX3

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Re: Saw wobble
« Reply #11 on: February 07, 2016, 04:14:10 PM »
Ron, I will soon enough learn the sound of my saw, but I have only sawn about 10 logs with it so my ears aren't perked up yet. Lol
John 3:16
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Offline Gearbox

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Re: Saw wobble
« Reply #12 on: February 08, 2016, 09:53:37 PM »
Faster may be some better , mine stands up at 600 I try to run 625 . Have run it up to 650 . any faster it will heat .
A bunch of chainsaws a BT6870 processer , TC 5 International track skidder and not near enough time

Offline CX3

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The old circle saw tips and techniques
« Reply #13 on: February 11, 2016, 09:55:32 AM »
Hey all I have been making some ties and good lumber since I had my saw hammered. I guess I sawed too long with dull teeth, it got warn and laid back down on me. I really didn't think the teeth were dull though, but they were. I shoulda checked. Post your valuable life lessons learned at the circle head rig here. I'd be glad to hear them before I pull my hair out here in southern missouri.
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Offline beenthere

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Re: The old circle saw tips and techniques
« Reply #14 on: February 11, 2016, 11:09:01 AM »
I'm puzzled that you started a new thread here, when your "saw wobble" thread contained some great information and explanation. Plus included the comment that you have a good neighbor who is experienced and helped you sharpen your saw, and "hammered" it back into cutting good again.

http://www.forestryforum.com/board/index.php/topic,88534.msg1359163.html#msg1359163

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south central Wisconsin
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Offline Jeff

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Re: The old circle saw tips and techniques
« Reply #15 on: February 11, 2016, 11:12:39 AM »
There are valuable circle saw tips through out the Forestry Forum. No need to try and regather them here. I'm going to merge this with your original topic.
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Offline CX3

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Re: Saw wobble
« Reply #16 on: February 11, 2016, 07:52:31 PM »
Well everything was running along fine, then it just quit sawing good. My buddy came over to check it out again, and he thinks the collars are bad?? He says it is super tight in the middle. So I am headed to a guy in the morning and he says he can roll the saw and flatten it.

I guess my point is I am getting frustrated at this mill. I have literally checked, and rechecked every piece and it still heats.  My rpm is correct. Teeth sharp. Track plumb. Clean logs. Guides ok. Lead good. I don't know what else unless it's just me.
John 3:16
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Offline CX3

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Re: Saw wobble
« Reply #17 on: February 11, 2016, 07:54:03 PM »
I originally thought the teeth were dull but he said they were fine
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Offline Gearbox

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Re: Saw wobble
« Reply #18 on: February 11, 2016, 09:15:56 PM »
What are you running for lead . I run 1/8 if i get out to 1/4 it will saw good for a while [ 2 or 3 logs] then start to heat . stay with it we will figuer it out . If you are running  belt drive you sure you arn't pulling the lead out of the saw with too tight a belt?
A bunch of chainsaws a BT6870 processer , TC 5 International track skidder and not near enough time

Offline dgdrls

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Re: Saw wobble
« Reply #19 on: February 11, 2016, 09:39:15 PM »
Well everything was running along fine, then it just quit sawing good. My buddy came over to check it out again, and he thinks the collars are bad?? He says it is super tight in the middle. So I am headed to a guy in the morning and he says he can roll the saw and flatten it.

I guess my point is I am getting frustrated at this mill. I have literally checked, and rechecked every piece and it still heats.  My rpm is correct. Teeth sharp. Track plumb. Clean logs. Guides ok. Lead good. I don't know what else unless it's just me.

How is the saw acting (what happened specifically) when it quit sawing good, what messages is it sending?
as @Gearbox indicated you'll get it
Dan


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