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Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? Static charge on wood Question
Forum Responses
From contributor D: The idea above might work but I wouldn't want to keep a grounding braid on a spinning shaft. I would check the ground on the planer. I sometimes find three phase machines without a good ground. Same with your moisture meter. Then, make sure the moisture meter and planer are tied together. A couple months ago, I put a post up that points out that you can blow up Wagners with static by sliding them around on dry wood.
My grounding pole is 8 feet long, driven in 8 feet of shell. When we have a dry spell like now, I get a lot of static off my planer and tablesaw. A guy told me to pour a bucket of water where the grounding rod is when it's dry out. Works for me. From the original questioner: Thanks for the input. Our electrician will be coming in to check the grounding on our planer and cutter head. I would warn anyone operating an in-line moisture meter to check out the static charge on their wood. It took us months to realize that it might be the cause of our incorrect readings. This after various attempts to correct other things that had no real affect on the meter. Do you have metal rolls exiting the planer? These need to be grounded. The static can be eliminated by using with a high humidity or even a moisture mist. This static is not common on higher MC lumber, so your wood has been somewhat over-dried. Over-dried wood with a high speed planer will be a problem. Gene Wengert, forum technical advisor
From contributor D: Wood in the 5% to 8% range can contribute to static discharge. I've seen the problem with capacitive meters. But you are right about the rollers. They also should be tied to the planer and moisture meter. From the original questioner: We thought about introducing more moisture to the planer booth, but that adds more variables to the mix. Will surface moisture alter the readings? Will applying a mist increase surface checking? Will a moist environment cause problems with our bearings and equipment? The wood is dried between 6 and 8% moisture. The problem is more extreme the drier the wood, but it is still there when the wood is at 7%. We would love to run our product at higher moisture contents since it runs better through the plant, but our product is shipped to very dry climates and we would have quality problems if our product was manufactured at a higher moisture content than it is used in. We will work on the grounding. We did try metal brushes that are actually drum brushes that worked well for removing small amounts of static. They have metal that runs from the brush through the handle with a loop on the top. Just attack a grounding wire and voila - an inexpensive and effective way to remove small amounts of static from the surface. Unfortunately, in about 4 inches, the static contained in the core of the wood rose back up. We have heard they have worked well in other applications. Two brushes at your local music shop are about $15.00.
The comments below were added after this Forum discussion was archived as a Knowledge Base article (add your comment). Comment from contributor A:
In terms of wood "insulating" properties this is not necessarily so. It is best to think of wood as a dielectric and in this way the wood should be able to be discharged. The rate at which you discharge the wood can depend on the type of deionizer you purchased. Your planer should not be the cause of your static buildup. To pinpoint the source you can rent an electrostatic field meter and measure the charge on the wood and trace its path throughout your facility. Then you will see exactly where the charge has buildup. Have you reviewed the related Knowledge Base areas below? 
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