I can second Netanel on finish from Tersa. It is smooth and in raking light you can see the blade mark lines but not feel them. I go to 180 (unless need lower grit finish) and do a few swipes to remove milling marks.
It does bother me that the blades nick easily. I thought I was getting nicks due to not being careful about what I plan. So plan was to get a new set and use it judiciously on final planning. Well I did that but nicked blade on first pass on glue line. A huge benefit of a Dual 51 is to be able to joint plane glueups. One can shift blades but still annoying.
Tersa finish is great. The chip volume is high which may be an issue for business but as David said, it makes lighter bags. I am not sure which way I will go if there is another planer in my life.
FWIW, few yrs back I read on Sawmill Creek that dummy blades are available for purchase, not recommended to use older worn blades as dummy blades and surprisingly there is a place that sharpens Tersa carbide blades.
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On Mar 27, 2025, at 1:16?AM, netanel.belgazal via groups.io <netanel.belgazal@...> wrote:
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Yes, you can see the difference between Tersa and spiral. You can easily go from planer directly to 150-180 (my final grit when using hardwax)
with spiral I had to go down to 80-100 to remove some minor milling marks.?
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60 gallon can handle it, it depends on how frequent you are willing to empty it. I can easily fill a 35 gallon in a single milling operation.