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Thread: scraping / tear out
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18th June 2006, 12:05 PM #1
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scraping / tear out
Hello all, maybe some one can help.
I have a piece of seasoned red cedar 450/300/12 which I have flattened & squared from a thicker piece to make a box lid. The piece was cut from a limb & has two knots which give it "character" but make it very cranky to plane.
Problem is I keep getting tear out . The board was cut on a bandsaw, flattened with a #7, then a sharp LA62 , then 112 scraper and finally card scraper & sand paper. All the above leave a degree of tear out but with 180 paper I get rid of one lot & open up another mostly on the underside of the knot in the softest wood. The knots proper are hard & plane perfectly.
This wood isnt whispering, its hissing. Its:mad:
Whats the answer? Any help will be appreciated, thanks , Bill.
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18th June 2006, 12:17 PM #2
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glue size (diluted PVA) before scraping or sanding
the glue will make the softer fibres stiff enough to cut with the sand paper
ian
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18th June 2006, 09:30 PM #3
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Cedar (Toona spp.) can be a real mongrel at times. There are pieces that are better just chucked in the fire. It sounds like you could be dealing with a piece in which there is significant reaction wood, in which case you are wasting your time scraping (cedar is rarely hard enough to scrape, at the best of times) .
However, you seem to want to persist, so if you can't get it to the stage of being able to sand from 220 grit or finer with a sharp plane, then try the other Ian's suggestion of glue-sizing. Use a glue which sets hard (hide glue), and make it very dilute. Take it to as far as you can with a very sharp blade, then apply the sizing before the final grit or two, (make sure it is well cured before you get stuck into it with the paper or you'll get a lot of clogged bits of paper and a very short temper in no time flat!).
Good luck,IW
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19th June 2006, 07:24 AM #4
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Thanks to you both. I will try the PVA idea & see how it goes. Regards, Bill
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19th June 2006, 06:53 PM #5
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I work with red cedar and spruce for my guitar tops and often have problems with grain runout. I find that scraping with the scraper at an angle to runout direction can help. Also make sure the scraper is sharp.
It sounds like the cedar youre working has some mongrel runout in it..might be more time effective to find a better piece.Whatever note you blow youre never more than a semitone away from the correct one....(Miles Davis)
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