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Author Topic: Edger not cutting straight  (Read 706 times)

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Offline strunk57

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Edger not cutting straight
« on: December 06, 2018, 05:15:50 PM »
Hello All! I have a marathon edger that I have spent a small fortune on. I just got it back from the machine shop. I had the sliding blade arbor fixed, and the main shaft checked. Everything is a go. First board ran through perfect. Then from there every board that ran through both blades cut crooked as in the first 5-6 ft was straight then curved. Still cutting the target width but crooked like something is pulling the board as it come out of the end. Could it be the edger isnít sitting perfectly level? Any other opinions on what could be going wrong? 
99 timberking b-20. John deere 450c loader. 79 Chevy c-60 95 GMC 2500, Craftsman tablesaw, Dewalt 735 13" planer, stihl ms-290 Stihl 029, Husqvarna 394xp, dewalt router & table, various sanders/hand tools.

Offline redbeard

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Re: Edger not cutting straight
« Reply #1 on: December 06, 2018, 05:28:43 PM »
Could tension in the boards be causing you grief?
Maybe run some plywood through it.
Just a thought.
Whidbey Woodworks and Custom Milling  2019 Cooks AC 3662T High production band mill and a Hud-son 60 Diesel wide cut bandmill  JD 2240 50hp Tractor with 145 loader IR 1044 all terrain fork lift  Cooks sharp

Offline Southside logger

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Re: Edger not cutting straight
« Reply #2 on: December 06, 2018, 05:53:34 PM »
Is that a belt or roller feed? 
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Offline strunk57

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Re: Edger not cutting straight
« Reply #3 on: December 06, 2018, 07:38:13 PM »
Roller
99 timberking b-20. John deere 450c loader. 79 Chevy c-60 95 GMC 2500, Craftsman tablesaw, Dewalt 735 13" planer, stihl ms-290 Stihl 029, Husqvarna 394xp, dewalt router & table, various sanders/hand tools.

Offline Southside logger

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Re: Edger not cutting straight
« Reply #4 on: December 06, 2018, 07:42:32 PM »
Tension higher on one side than the other allowing slip?
Franklin buncher and skidder
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Woodmizer LT Super 70 and LT35 sawmill, KD250 kiln, BMS 250 sharpener and setter
Riehl Edger
Woodmaster 725 and 4000 planner and moulder
Enough cows to ensure there is no spare time.

Online moodnacreek

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Re: Edger not cutting straight
« Reply #5 on: December 06, 2018, 08:16:35 PM »
This is a very common problem. A feed roller edger with no out feed fixed guides or shifting guides has to cut straight on it's own. The reason many edgers have no guides is because peeling  bark strips and other things get caught in them. Also some operators don't need real straight boards.  The mandrel must be square to the frame or infeed , one edge fence. Next the feed rolls are to be parallel to the mandrel . Do this with a stick cut short with a wood screw in the end for an adjustment and to gage between  the mandrel and feed roll and make another one to fit feed roll to feed roll if needed. If you have dead rolls infeed or out feed they also must be  parallel to the mandrel and feed rolls. Any thing the board touches must be flat level and of equal  bearing and friction. Even after this not all boards will cut straight but most should. If you have an overhead guide lite on the fixed saw [in a dark building] you can learn to guide the board  but this is dangerous if you hold on too long. Don't give up, it can be made to work.

Offline Brucer

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Re: Edger not cutting straight
« Reply #6 on: December 07, 2018, 12:31:50 AM »
My old edger had powered infeed and outfeed rollers. You had to guide the board by hand at the start, until the outfeed roller grabbed it. Otherwise there'd often be a slight hook at the end of the board.

Keeping the gap between the rollers consistent from one side to the other is a must. Mine had an adjustable spring on either side of the rollers to maintain downward pressure. The pressure had to be consistent from side to side as well.

I'd still run into trouble with pitchy boards. Sawdust would start to build up on the feed rollers (mainly in line with the saw blades) and this would cause unequal spacing and pressure from one side to the other.

I discovered that WD-40 and a wire brush did a pretty good job of cleaning up compressed sawdust.
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Offline strunk57

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Re: Edger not cutting straight
« Reply #7 on: December 07, 2018, 07:29:41 AM »
Most the boards are covered in dust, that makes sense. The first board ran perfect. I did notice some build-up on the rollers. Now the question would be how to keep them from building up?
99 timberking b-20. John deere 450c loader. 79 Chevy c-60 95 GMC 2500, Craftsman tablesaw, Dewalt 735 13" planer, stihl ms-290 Stihl 029, Husqvarna 394xp, dewalt router & table, various sanders/hand tools.

Online moodnacreek

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Re: Edger not cutting straight
« Reply #8 on: December 07, 2018, 08:41:59 AM »
When edging pine the sap sprays on everything and builds up on the [pipe] press rolls. I remember thinking that was a problem and cleaning it off. This is not practical. They real problem at that time was that the 2nd. out feed dead roll [on the outfeed table was out of square] and sometimes the board would not contact it and saw ok. When you are running the machine it is impossible to trouble shoot these little problems. This is why everything has to be measured out exactly to leave no doubt about alignment. Edgers can drive you nuts.

Offline Mad Professor

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Re: Edger not cutting straight
« Reply #9 on: December 07, 2018, 09:06:42 PM »
I ran an edger in a commercial mill years ago.

It is important to get the board started true.  But more of a problem, when cutting pine, was buildup of dust/pitch on the rollers.  We had a hand pump sprayer w/diesel fuel in it, if we started getting curved boards, or when taking a break when the sawyer was sharpening the circle mill, we would spray down the rollers.

Online moodnacreek

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Re: Edger not cutting straight
« Reply #10 on: December 08, 2018, 08:19:30 AM »
It was only the press rolls that got the build up on my edger.  The feed rolls, 4 shafts with 4" star wheels, don't get the pine build up but if any thing else gets caught in them the board will curve.


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