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Author Topic: Did I make a mistake  (Read 1165 times)

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Offline Cumberlandcat

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Did I make a mistake
« on: January 03, 2021, 11:09:01 AM »
Morning 
Breaking blades constantly 
I will try to keep this to the point. 
Iíve run my lt40 wide for a year and a half with very few issues. Iíve always had Woodmizer sharpen my blades for years. Iím out of town and cutting all the lumber for my brothers house. I had a local guy sharpen my blades so we could get them back quicker. Iíve broke 7 out of 10 blades in 2 light days of cutting. Iíve broke maybe 3 blades since Iíve had the mill. I was cutting oak and after breaking 6 I switched to pine. Broke a blade in no time. Canít keep pitch off of them too. Iíve tried every solution I can think of other than diesel. But Iíve never needed anything but pinesol in 8 years of sawing. Did my blades get wrecked????????
Iím in a jam and only brought 25 blades. Any help would be appreciated. 
Thanks in advance 
Lt40 super wide, 3 Stihl saws, Mahindra 4530
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Offline stavebuyer

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Re: Did I make a mistake
« Reply #1 on: January 03, 2021, 11:50:33 AM »
I would look at blades first if nothing else has changed. You might look close at the gullet and see if the full profile was ground vs just hitting the tips of the teeth. Also lack of proper set could be causing issues as well. 

Offline Cumberlandcat

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Re: Did I make a mistake
« Reply #2 on: January 03, 2021, 11:54:37 AM »
I notice a heavy burr in the gullet. Iíve truthfully never checked my others because Iíve never had an issue. So Iíd say he sharpened more than the tip. Will a burr cause a bunch of issues. I guess I should know all of this by now but been blessed to be problem free all these years in this aspect. 
Lt40 super wide, 3 Stihl saws, Mahindra 4530
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Offline stavebuyer

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Re: Did I make a mistake
« Reply #3 on: January 03, 2021, 11:55:01 AM »
I'd invest in a box of new blades to finish your task and know that the local sharpening wasn't up to snuff.

Offline kelLOGg

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Re: Did I make a mistake
« Reply #4 on: January 03, 2021, 01:10:44 PM »
Is it just one burr at the weld? If so, it sounds like a leftover from the welding process. That disappears on the first sharpening so that suggests the gullet was not sharpened.
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Offline terrifictimbersllc

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Re: Did I make a mistake
« Reply #5 on: January 03, 2021, 02:08:28 PM »
Do the resharpened blades cut like you're used to with a freshly sharpened blade?
DJ Hoover, Terrific Timbers LLC,  Mystic CT Woodmizer Million Board Foot Club member. 2019 LT70 Super Wide 55 Yanmar,  LogRite fetching arch, WM BMS250 sharpener/BMT250 setter.  2001 F350 7.3L PSD 6 spd manual ZF 4x4 Crew Cab Long Bed

Offline SawyerTed

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Re: Did I make a mistake
« Reply #6 on: January 03, 2021, 02:10:13 PM »
A close look at the blades with a magnifying glass should help you see if there are cracks in the gullet on your blades.  When Iíve broken blades most times it is due to stress cracks in the gullet.  A close look at the break on a freshly broken blade will also reveal if there was a crack in the gullet.  When I get a blade break, I expect others of the same age/batch to break as well.  

Other times blades have broken at the weld.  Breaks at the weld are not rare but much less frequent and can be replaced by WM. 
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Re: Did I make a mistake
« Reply #7 on: January 03, 2021, 02:31:10 PM »
Without seeing the bands we are all guessing and before we throw the guy who sharpened them under the bus...what condition are your wheel belts in? If the band is hitting the wheel due to worn out belts, or riding against the roller guide shoulder then you will break bands quickly.

Just check the potential obvious places too.
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Offline richhiway

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Re: Did I make a mistake
« Reply #8 on: January 03, 2021, 02:37:10 PM »
If you are building a lot of pitch is the blade tension increasing from build up under the belts? try some diesel to keep the blades clean.
?
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Offline Haleiwa

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Re: Did I make a mistake
« Reply #9 on: January 03, 2021, 02:48:32 PM »
Without seeing the bands we are all guessing and before we throw the guy who sharpened them under the bus...what condition are your wheel belts in? If the band is hitting the wheel due to worn out belts, or riding against the roller guide shoulder then you will break bands quickly.

Just check the potential obvious places too.
When I called Woodmizer Maine with a blade problem, the first thing he asked was the condition of the tire belts.  He also said to check the condition of the drive belts.  A slipping drive belt will slow down the speed of the blade.
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Offline Cumberlandcat

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Re: Did I make a mistake
« Reply #10 on: January 03, 2021, 02:52:18 PM »
Thanks for all the help. The burr is heavy on every gullet. On one side and thatís the side Iím getting pitch build up. 
Belts are new or have 10 hours on them. This was the first sharpening on these and usually I donít push my blades hard. I try to pull them long before they are dull. Iím going to see how quickly I can get new blades. Just didnít know if I was missing something obvious. And Iím not throwing the gentleman under the bus. 
Thanks 
Lt40 super wide, 3 Stihl saws, Mahindra 4530
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Self built heated kiln with evaporators

Offline PA_Walnut

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Re: Did I make a mistake
« Reply #11 on: January 03, 2021, 03:47:36 PM »
Looks at your guides and see if it looks like the blade is riding on them. If so, heats up blades and will cause breakage too.

Pitch buildup causes all sorts of evil.

  • Be sure that the lube is going on the teeth area of the blade, and not just the back of blade. 
  • Add Pinesol to tank along with dish soap...LOTS of it. I discovered I was being stingy with the soap and adding LOTS really help. I put about 1/2 a small retail bottle in per tank.
  • As others mentioned (or will). Diesel helps. I use the soap/sol combo and use a squirt bottle to hit the blade a bit if buildup starts gaining on me. If I sawed pine more often, I'd put a little aux tank/sprayer on with diesel.
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Offline KenMac

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Re: Did I make a mistake
« Reply #12 on: January 03, 2021, 06:19:02 PM »
Just a question here. Does the guy who sharpened your bands have the proper cam, CBN wheel, or whatever he needs to sharpen your profile blades? If not, that would possibly cause issues.
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Offline terrifictimbersllc

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Re: Did I make a mistake
« Reply #13 on: January 03, 2021, 07:03:56 PM »
Hard to imagine that something in a sharpening process contributes to blade breakage and residue buildup.   Maybe if it wasnt sharpened well at all and continued use was like pushing a dull band.  But you would have noticed if the blades didn't saw like they had been sharpened (?).

Buildup on the burr side seems like a coincidence.  The burr side would be the inside of the blade on my sharpener.  The inside of the blade is where most buildup occurs (between band and band wheel).  And isnt the burr gone after sawing one board?

Don't have an answer as to what it is though.
DJ Hoover, Terrific Timbers LLC,  Mystic CT Woodmizer Million Board Foot Club member. 2019 LT70 Super Wide 55 Yanmar,  LogRite fetching arch, WM BMS250 sharpener/BMT250 setter.  2001 F350 7.3L PSD 6 spd manual ZF 4x4 Crew Cab Long Bed

Offline Brad_bb

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Re: Did I make a mistake
« Reply #14 on: January 03, 2021, 08:13:56 PM »
7/10 breaking is not normal at all.  I've had 3 or 4 bands break in the 6 years I've been milling.  I only use WM resharp.  But from what you guys are describing, seems like a burr in the gullet could catch sawdust/buildup.

Is this a mill that has a tension dial gauge?  Have someone watch it as you're sawing and see what  happens?  Does it change?
Anything someone can design, I can sure figure out how to fix!
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Offline tawilson

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Re: Did I make a mistake
« Reply #15 on: January 03, 2021, 09:28:21 PM »
That burr is normal after sharpening.  I rub it off with a piece of hardwood before setting to make the set more accurate. 
Tom
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Offline Bradm

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Re: Did I make a mistake
« Reply #16 on: January 04, 2021, 05:09:42 PM »
There are burrs and then there are what was this guy thinking type of burrs.  All grinding on steel will leave a burr (18 years and counting experience grinding metals), but heavy and dry hogging will leave a burr that can only be removed by further grinding as well as causing a hard spot along the contact patch between the grinding wheel and band.

Do you have a picture of the burr and a side by side comparison of a new band and a suspect band?


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