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- Newsgroups: rec.woodworking
- Path: sparky!uunet!spool.mu.edu!sdd.hp.com!usc!elroy.jpl.nasa.gov!decwrl!adobe!usenet
- From: bennett@adobe.com(Bennett Leeds)
- Subject: Re: How to get a square edge
- Message-ID: <1992Dec22.235513.10307@adobe.com>
- Sender: usenet@adobe.com (USENET NEWS)
- Reply-To: bennett@adobe.com
- Organization: Adobe Systems Incorporated
- References: <1992Dec21.123736.9479@iccgcc.decnet.ab.com>
- Distribution: na
- Date: Tue, 22 Dec 1992 23:55:13 GMT
- Lines: 36
-
- carrd@iccgcc.decnet.ab.com writes
- > I've run into this problem alot when dealing with long pieces of wood
- > (> 5') and thought I'd ask the wisdom of the net. The problem I refer to
- > is getting a true edge on a board when the deflection of the warp is
- > only about 1/2 - 1 inch over the entire length. The bed on my jointer
- > (Jet 6") is too short to detect the curve, thus all I end up with is a
- > curve on a smaller width board.
-
- You should be able to successfully joint a 6' board on your jointer.
- With a 1/32" depth of cut, it may take 32 or more passes to get rid
- of a 1" edge curvature. A shorter bed may slow things down still more, but
- you should be able to get it flat.
-
- The first thing to look at is your technique. If the edge is concave, you
- should be pressing down on the outfeed side as soon as you have enough wood
- on the outfeed table. Each pass should remove material at the ends of the
- board until they're reduced to be in line with the middle. If the edge is
- convex, then you should try to prevent the board from rotating slightly as
- you're pushing it through the jointer; basically each pass will flatten the
- middle a bit more until it's in line with the ends.
-
- If improved technique doesn't help, then perhaps the jointer needs adjustment.
- The infeed and outfeed tables need to be parallel to each other in both
- directions, as well as parallel to the cutterhead. The outfeed table should be
- flush with the peak of the knives (either adjust the table or adjust the
- knives). If the outfeed table is too low (knives too high), you'll get a curved
- edge, or get some snipe at the very end of the pass. If the table is too high,
- the wood will bump into it.
-
-
- > Anyone come up with a slick way around this problem?
-
- If you have a tablesaw, you can build a long sliding table jig for it.
-
- - Bennett Leeds
- bennett@adobe.com
-