Sometimes I get calls about excessive marking or indentions in wood being planed by the top head. This is called "chip dent" or sometimes "hammermarks". It causes a flaking appearance to the wood. This occurs more in some species of wood than others. And sometimes very old wood will do this. In particular, Larch, is a wood this can be excessive in. Sometimes, the weather, such as high humidity can enhance this, so some shops take wood prone to do this straight from the kiln to milling whenever possible to help reduce this. This is a difficult problem to solve.
These marks come from the chips being caught between the planer knives and the wood and being pressed into the wood surface. The length of the chip that the knife is making and the amount of suction you have on the top head and the grain of the wood or type of the wood can all affect this. Some owners have experimented with putting a back bevel on the planer knife so that you have more of a chisel point on the knife in order to reduce this. It has also been recommended to put compressed air on the back of the head to blow these chips off before they come around the head again. Of course, having a good vacuum system on this head is a must.
I recently talked to a PH260 owner that was able to reduce this successfully in a recent project that he did on Larch wood. Brian Williams of New York told me what he was able to resolve this problem and produce some beautiful wood on the PH260. He did say it took some experimenting to get the problem to go away. But, he finally settled on projecting the knives out a little longer (20-40/1000s) and increasing the feed speed until this marking dissappeared. The longer knives makes for a bigger fan perhaps to move those chips out and the speed helps this as well.
This is one of the hardest problems to solve when encountering this in these woods that are prone to this phenomenom and I really appreciate Brian sharing his experience with me on reducing this hammer marking when planing Larch.
If you have had this happen in your planing and have some success with reducing it, please comment here. There is a way to leave comments on this blog, so feel free to share your experiences.
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