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The Forestry Forum

General Forestry => Sawmills and Milling => Topic started by: Patrick NC on May 24, 2022, 06:59:31 PM

Title: Pitch on top of blade only
Post by: Patrick NC on May 24, 2022, 06:59:31 PM
How come pitch only sticks to the top of the blade and the bottom is clean? Is it because sawdust gets compressed between the bandwheels and the blade, or is there another reason?
Title: Re: Pitch on top of blade only
Post by: Magicman on May 24, 2022, 08:25:38 PM
Yup, it gets smashed between the blade and bandwheels. 

I have never seen buildup on the bottom of a blade which led me to close the opening on the lower LubeMizer nozzle several years ago.
Title: Re: Pitch on top of blade only
Post by: terrifictimbersllc on May 24, 2022, 08:26:40 PM
Maybe sap gets squeezed out of the wood (sawdust) and spread out onto the blade. 
Title: Re: Pitch on top of blade only
Post by: Crossroads on May 24, 2022, 08:51:04 PM
My theory is the pitch flakes/peels off the outside as the band flexes. 
Title: Re: Pitch on top of blade only
Post by: KenMac on May 24, 2022, 09:03:38 PM
Maybe it's like a tire is only flat on the bottom?  
Sorry, Howard's devil paid me a visit, too.
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