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Danny Harvey

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A recent thread mentioned the use of VA in sawmills. Although we con't have any of the really big mills around here we do have several of considerable size and it has been my experience that, as an industry, sawmills don't widely utilize predictive maintenance techniques.

Is there a resource for information on sawmill-specific uses for vibration analysis?
OLi

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Correct, sawmills are black holes regarding pdm here. We have worked many years to improve that with minimal result and a very few have "seen the light" and had very good result with limited effort. The rest are thinking it is a side kick to the farm and shut down for coffee break..... despite they run 2 shift or more.... and are in fact a process industry. So monitoring is just the normal, bearing condition, looseness and unbalance etc. You may like it better to collect data while not sawing if you are allowed to. It was so much easier with papermills, there are companies that compared maintenance cost btw. paper and saw mills in respect to passed volume and sawmills are a disaster.
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Noknroll

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Reply with quote  #3 
I was involved in Sawmill VA about ten years ago and it was valued by the millers. As Oli said the usual suspects, bearing faults, unbalance, alignment etc. The log handling equipment is better if you can run it with out the logs banging about.
JuddJones

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Quote:
Originally Posted by Danny Harvey
A recent thread mentioned the use of VA in sawmills. Although we con't have any of the really big mills around here we do have several of considerable size and it has been my experience that, as an industry, sawmills don't widely utilize predictive maintenance techniques.

Is there a resource for information on sawmill-specific uses for vibration analysis?


I am not aware of any resources specifically for VA in sawmills. The sawmill industry is an interesting mix of state of the art sawmills (where I worked) to 1950's technology (where I started out of high school). The culture at these facilities somewhat mirror the age of the technology used. The smaller old school mills will take noisy pillow block bearings off higher speed machines (1800-3000 RPM), and save them to install on slow speed conveyors because they still have life. Keep in mind, noisy to them isn't heard with a screwdriver to the ear in quiet environment, they are badly spalled bearings.

Most every sawmill I have had experience with recently, that has something resembling a reliability program is very early stage. The culture in most mills is a couple decades behind what we are used to in Petrochemical and papermills. The increase in technology, and the corresponding exponential increase in the rate at which they can mutilate tree carcasses is causing them to be more reliability focused. The impacts involved with the large logs and cants banging the equipment make monitoring difficult. Also, the robust nature of the equipment can make mounting sensors in a place where they will survive and provide a good signal a challenge. A vibe guy on the off shift running and monitoring the equipment with no lumber in the process offers the best bang for buck in my opinion. 
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