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Sharpening Planer Knives

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Forum topic by TheWoodenOyster posted 07-29-2014 08:11 PM 524 views 0 times favorited 12 replies Add to Favorites Watch
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TheWoodenOyster

976 posts in 658 days


07-29-2014 08:11 PM

Topic tags/keywords: planer jointer

I have a project coming up with some curly maple involved. I don’t sharpen my planer knives much, but I do replace them every once in a while. I am a little worried that my dull knives might ruin this curly maple, so I thought I would ask:

Is sharpening planer knives worth it? Or should I just buy new ones?

My sharpening tools consist of stones and a strop, no machines. I can and do sharpen hand tools well, but have never tried to sharpen jointer or planer knives.

-- The Wood Is Your Oyster


12 replies so far

View SamuraiSaw's profile

SamuraiSaw

486 posts in 687 days


#1 posted 07-29-2014 08:19 PM

You don’t say what kind of planer you have. Are they disposable knives?

Unless you have a good setup, I wouldn’t try to sharpen planer knives. Too difficult to keep them even. There are a number of options in DFW for getting them sharpened. Give me a shout and I’ll see if I can help you.

-- Artisan Woodworks of Texas.... www.awwtx.com

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CharlesA

1911 posts in 520 days


#2 posted 07-29-2014 08:23 PM

I took the advice of Bob Kloes and dampen the face and skew the board as much as possible. Worked well on my Ridgid lunchbox. I’ve put a fair amount of curly maple through that way.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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TheWoodenOyster

976 posts in 658 days


#3 posted 07-29-2014 08:36 PM

Samurai – I have a dc 33. And I suppose they are disposable???, but they aren’t the double sided sort that come with lunchbox planers. Samurai, I’ll PM you about places to get knives sharpened.

Charles – Hadn’t thought of skewing. That is a good call. I was planning to dampen with alcohol.

-- The Wood Is Your Oyster

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CharlesA

1911 posts in 520 days


#4 posted 07-29-2014 08:40 PM

Here is what he wrote to me:

You can wet the wood before you plane, that helps some. Not soak it, but run a wet rag over the board before planing. Also running at a skew can help some. Run your hand over the board, its like cat’s fur. You will feel which way to run the piece with the grain. Just some ideas.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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TheWoodenOyster

976 posts in 658 days


#5 posted 07-29-2014 08:42 PM

What are you wetting with? I assume mineral spirits or alcohol. I don’t know if alcohol would even stay wet long enough to feed it through?

-- The Wood Is Your Oyster

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CharlesA

1911 posts in 520 days


#6 posted 07-29-2014 08:44 PM

water

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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TheWoodenOyster

976 posts in 658 days


#7 posted 07-29-2014 08:45 PM

Huh. Ok I will give that a shot.

-- The Wood Is Your Oyster

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CharlesA

1911 posts in 520 days


#8 posted 07-29-2014 08:46 PM

Seems odd to me to, to put water on a board and run it through a planer, but it works.

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

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TheWoodenOyster

976 posts in 658 days


#9 posted 07-29-2014 08:54 PM

Me too. But hey, I’ll try anything once

-- The Wood Is Your Oyster

View Planeman40's profile

Planeman40

503 posts in 1484 days


#10 posted 07-29-2014 10:11 PM

Planer knives aren’t expensive and getting them sharpened isn’t expensive. Buy another set of new knives and send the old ones out to be sharpened. And here is why you want to send them out. A professional sharpener has the equipment to sharpen each blade taking the exact same material off each one so they all end up with the same blade depth after sharpening. This is important. As long as you don’t alter the blade height adjustment on the planer, the sharpened blades can be re-installed with no worries abut adjusting the blade height. They will all be the same. If you do it yourself you will never get each blade the same and will have to go to a lot of trouble re-adjusting the blade height of each blade using a dial test indicator. This is not to say you can’t give the blade a little touch-up with a sharpening stone while they are in the planer. But more than a little touch-up will present problems. And one other thing. When installing the new or re-sharpened blades, always cover the sharp edge with a couple of layers of masking tape. You can get a nice gash if you don’t!

Planeman

-- Always remember: It is a mathematical certainty that half the people in this country are below average in intelligence!

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bigblockyeti

1737 posts in 444 days


#11 posted 07-30-2014 03:43 AM

I’m 99% certain the DC 33 came with non-disposable blades and would only have them if someone retrofitted such a blade system into the machine at some point.

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TheWoodenOyster

976 posts in 658 days


#12 posted 07-30-2014 04:35 AM

Bigblock, I think you are right. I just sort of assumed all planer knives were “disposable”, but these are pretty hefty and look like they ought to last a while.

-- The Wood Is Your Oyster

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