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I am not sure what particular model was for sale and I do not own a Kundig. ?However, I am familiar with the features of this brand. ?When comparing certain Kundig models to Hammer and large older units, there are certain UNIQue features.
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With the infeed and outfeed fences along with the ability to move wood along the table, you can have the edge sander function like a jointer, only for edge sanding. ?Like with a jointer you can adjust the amount of removal. ?This way of sanding allows you to edge sand boards without a length limit while lowering the footprint of the actual machine. ?With the actual sanding limited to a small area at a time, that greatly facilitates dust collection. ?I have seen a massive edge sander in use and what a dust making machine! ?For machines where the fence flips up, you can have access to more of the belt similar to models that do not have fences.
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Certainly they are more expensive than a Hammer but I think they along with Langzauners are very different machines. ?I included a link to a demo video.