Reply To: moulding plane will not cut smoothly.
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This can be an issue with the wedge. The wedge needs to be tight against the side of the mouth and tight against the back of the blade. It needs to taper to an edge or point. When these conditions fail, the emerging shaving can be trapped or misdirected by the tip of the wedge. The result is jamming. I doubt you need to widen the mouth, but you can inspect all of the exposed surfaces in the throat / escapement to make sure there are no projections that could be catching the shaving. This is unlikely, but I have seen it.