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I think you should do more to get more strokes
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(11-30-2018, 12:30 PM)C. in Indy Wrote: Philosophers:
Sorry if this has been treated before, but I keep thinking the rotary blades on power planers and jointers are really hitting the work at angles more like scraping than planing.
I hardly ever use my power Jointer, but I recalled the blade bevel honing was supposed to be in the 37.5-45 degree range, and it hits the work "bevel down" at what would seem to me to be about 90 degrees "bedding angle". So I think it's a scraper.
Typical power planed boards, I would say, avoid tearout to an impressive degree, but they don't have the "sheen" that you get with low angle planing.
Your thoughts ?
Chris
.......................
Might be considered a "wedging" action.
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Thanks, All, for your contributed ideas and good humor.
I guess "asymptotically" if the depth of cut is keep << 1/32", it could be a bit of a scraper, like a scraping Lathe hand tool. But for any appreciable depth of cut, the wedging and cutting effects will be unfriendly to reversed grain.
By the way, I was almost refreshed on a project lately to do some sanding. I had been so caught-up in the ideal of perfectly planed surfaces that I forgot that sandpaper isn't always bad
Chris
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No. They’re cutting tools.
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(11-30-2018, 12:30 PM)C. in Indy Wrote: Is a Power Planer really a power Scraper ?
Chris
No
Steve
Mo.
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I do not understand what people are thinking. When the material is fed into the cutter on a power jointer or planer the cutting action takes place near the apex of the rotor holding the knives. The material encounters the knife edge at an angle not much different than that of a hand plane. Problem with the power tool and tear out is that there's not much of a way to have a tight mouth.
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More like a controlled powered chipper with a feeding table underneath.
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I would think it would be more of a power shearer.
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both a planer and a jointer use the same cutting action as a plane. There are power metal scrapers, but I don't think I have heard of a power wood scraper.
