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Walnut burn marks

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Forum topic by FlyFisher70 posted 10-20-2014 01:26 PM 1140 views 0 times favorited 16 replies Add to Favorites Watch
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FlyFisher70

12 posts in 784 days


10-20-2014 01:26 PM

Topic tags/keywords: walnut burn marks

I am new to woodworking, so this may sound like a dumb question… I have a couple large walnut slabs that that I am making into a kitchen table. The shop teacher at the local high school allowed me run the slabs through their planer and giant belt sander. I only took off as much as he recommended each pass, but the knots and and couple other spots have burn marks from the process. His parting comment was “Have fun sanding those out!” I have been sanding them for hours with 100 grit sand paper, but haven’t reached much progress, if any at all…

Is there something that I am missing, or are those burned knots pretty much there for good? Any advice would be helpful.

Thanks

-- Woodworking; there is no app for that.


16 replies so far

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AnonymousRequest

861 posts in 1014 days


#1 posted 10-20-2014 01:30 PM

Start with 40 grit.

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Gshepherd

1727 posts in 1667 days


#2 posted 10-20-2014 04:33 PM

Resurface and a little faster, Sanding out of the knot good luck. remember knots are harder than the rest of the wood. Going to to slow you will get burn marks. Shop teacher being a lot of help I see.

-- What we do in life will Echo through Eternity........

View mahdee's profile

mahdee

3553 posts in 1233 days


#3 posted 10-20-2014 05:15 PM

Try some mineral spirit on the surface and see if the burn marks blend in with the rest of the wood. If it doesn’t, apply some water over the area to raise the grain and either use a scrape card or hand-sand it off.

-- earthartandfoods.com

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JAAune

1646 posts in 1782 days


#4 posted 10-20-2014 06:24 PM

It’s always possible that the equipment isn’t kept in optimal maintenance so running the boards again may not help at all. Planer knives can be dull and belts can get clogged. That’s especially likely to be the case in a high school shop where budgets are tight and well-tuned equipment doesn’t pay for itself.

I’d second the advice given by Mr. Jinx. Card scrapers are much faster than sandpaper.

-- See my work at http://remmertstudios.com and http://altaredesign.com

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gfadvm

14940 posts in 2155 days


#5 posted 10-21-2014 12:17 AM

I’m with Jinx. Do the MS and see if they need further sanding. The knots usually look pretty black when finished.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

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FlyFisher70

12 posts in 784 days


#6 posted 10-22-2014 07:11 PM

Thanks for the advice, I will have to give a try.

-- Woodworking; there is no app for that.

View retfr8flyr's profile

retfr8flyr

327 posts in 1134 days


#7 posted 10-22-2014 07:52 PM

Another suggestion is, if you have any cabinet making shops in your area, usually the will run something through their big belt sanders for a few bucks. Their equipment would most likely be in much better shape than a high school shop.

-- Earl

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buildingmonkey

242 posts in 1013 days


#8 posted 10-23-2014 12:33 AM

Was talking to a young guy the other day who graduated high school about 5 years ago, he said they now have a widebelt sander at the local high school. He told about the thickness gauge was not set correctly, and kids would run their panels into the sander, where they would stop and it would cut a deep burn in the surface. So, what was said about school shops is probably true.

-- Jim from Kansas

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Logan Windram

303 posts in 1927 days


#9 posted 10-23-2014 12:51 AM

Knots are essentially end grain, and of you put the end grain on a disc sander it burns very quickly. I assume that drum sander it the culprit. My guess, be patient and sand on!

I think the fibers get burned deep, so it may take awhile

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firefighterontheside

13497 posts in 1322 days


#10 posted 10-23-2014 01:05 AM

Why don’t you show us a picture. May help.

-- Bill M. "People change, walnut doesn't" by Gene.

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FlyFisher70

12 posts in 784 days


#11 posted 10-23-2014 10:03 PM

I called a few cabinet shops, but no luck yet. I will keep trying. Patience is a virtue, especially with sanding. Here are a couple pics of where I am at now. They look better, but not quite where I was hoping they would be.

-- Woodworking; there is no app for that.

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a1Jim

115202 posts in 3042 days


#12 posted 10-23-2014 11:21 PM

If you don’t have much more burn as to what’s is shown in the photos,try using a random orbital sander start with 60 grit and see if that will get rid of the burn marks.

-- http://artisticwoodstudio.com Custom furniture

View mahdee's profile

mahdee

3553 posts in 1233 days


#13 posted 10-23-2014 11:34 PM

I don’t see any burn marks on that slab…You are good to go.

-- earthartandfoods.com

View AnonymousRequest's profile

AnonymousRequest

861 posts in 1014 days


#14 posted 10-23-2014 11:39 PM

After seeing it, I’d let it be. The darkness looks natural to me.

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firefighterontheside

13497 posts in 1322 days


#15 posted 10-23-2014 11:49 PM

I don’t think those are burn marks or you got rid of them. Try wiping some mineral spirits on there and see what it looks like.

-- Bill M. "People change, walnut doesn't" by Gene.

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