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- Newsgroups: rec.woodworking
- Path: sparky!uunet!sun-barr!cs.utexas.edu!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!cbnewse!jrdailey
- From: jrdailey@cbnewse.cb.att.com (j.rex.dailey)
- Subject: Re: Scraping/Burnishing versus Sanding
- Organization: AT&T
- Date: Thu, 19 Nov 1992 03:44:09 GMT
- Message-ID: <1992Nov19.034409.26400@cbnewse.cb.att.com>
- References: <Bxx494.Dr6@hpuerca.atl.hp.com>
- Lines: 50
-
- From article <Bxx494.Dr6@hpuerca.atl.hp.com>, by jp@hpuerca.atl.hp.com (John Pierce):
- >
- > Hi, gang!
- >
- STUFF DELETED
- >
- > I noticed that the scraper made the edges glossy, even on end grain. The
- > smaller the surface area, the glossier it was. I looked and wondered.
- >
- > Then it hit me. In Frank Klausz's Wood Finishing video, he did a demo on
- > a piece of walnut with "wild grain." He planed it, then scraped it,
- > then sanded. He explained that he sanded it because the scraper "crushed
- > the fibers."
- >
- > Of course! When you use a scraper, the scraper does more than just cut
- > grain with the burr, it actually burnishes the wood by compressing the
- > fibers. Remember, the burr is sharp on the cutting edge, but rounded on
- > the part that follows. That's why it looks so good.
- >
- STUFF DELETED
- >
- > So, I'd think that is why Frank Klausz uses sandpaper after scraping: not
- > to smooth, but to rough up the surface to allow a better bond. This would
- > open the fibers and allow the finish material to either penetrate more
- > deeply (for oil, etc) or to grip more area (for a surface finish).
- >
- > And if you *want* a burnished (less porous) surface, use the scraper, or
- > even burnish with a polished burnishing tool of some sort.
- >
- > Are these thoughts off base? Hmm...it will be interesting to see what
- > discussion will come after this.
- >
- >
- > ---
- > #################ANY#OPINONS#HERE#ARE#MY#OWN####################
- > John Pierce
- > Atlanta Technology Center
- > jdp@itpg004.atl.hp.com
- > (404) 850-2492
-
- John,
-
- The last thing Frank Klausz does to the piece of walnut is to sand it
- BECAUSE (using his words) "the wood will accept the stain or finish more
- evenly on a freshly sanded surface". While the scraped surface looks
- great, the sanded wood pores are not burnished and are more open. So they
- will more uniformly take the stain or finish being supplied.
-
- Rex Dailey
- jrdailey @ cbnewse.cb.att.com
-