I just bought a new blades for my DeWalt 733 planer (12 1/2"). Lowe's has them for about $40/pair.
I plan to take the old set to a blade sharpening shop and have them freshened up. Does anyone have an idea of what this will cost? I haven't a clue, but if it would be anywhere near $40 I know what I would do instead.
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I can't say what your local sharpeners charge (call them, if you have one ?) but planer knives here are $0.50 inch. So the pair for your 733 would run $12.50 at my shop. I would call that very cost effective since those can be sharpened several times.
And since this seemed to get ignored after I went to the trouble of making the videos (did that mainly for my facebook business page) I will link it in this discussion. Me doing it... Sharpening planer knives.
It isn't cost effective in my area either. So I bought the Mak wet stone wheel 15+ yrs ago for planer and jointer blades. I was never happy with the results. It does chisels and hand planes like no tomorrow, scary sharp like or better.
The cost of double sided blades came down so much that I just flip then toss them when they're toast. I clean and give an occasional slide against a hand stone. I do a light sand on stock to remove sap and sand and always check used lumber for metal. I can make a set last a yr