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Sharpening "throw away" planer blades

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Forum topic by TimH posted 1965 days ago 5069 views 0 times favorited 15 replies Add to Favorites Watch
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TimH

36 posts in 2164 days


1965 days ago

Hello everyone,

I have a DW planer with the “throw away” blades. Do anyone sharpen these like you would a good set of blades or do you all just bite the bullet and buy a new set? If you do sharpen them….what’s the easiest way to sharpen such a long piece of steel so its decently sharp? Thanks for the advice!


15 replies so far

View Greg Wurst's profile

Greg Wurst

781 posts in 2463 days


#1 posted 1965 days ago

Throw-away blades are usually such that they won’t index properly if they are made any smaller by sharpening. That said, if you can adjust the height of the blades to where they are supposed to be I don’t see why they can’t be sharpened. You can either pay someone to sharpen them or use something like a Tormek or Jet wetstone sharpener with the planer blade jig.

-- You're a unique and special person, just like everyone else.

View Julian's profile

Julian

880 posts in 2156 days


#2 posted 1965 days ago

DW blades are throw aways. There is no adjustable indexer and if you were to sharpen them, the blade would be a different height than the feed rollers, so the wood wouldn’t feed into the planer.

-- Julian, Park Forest, IL

View TimH's profile

TimH

36 posts in 2164 days


#3 posted 1965 days ago

makes sense…I just have a hard time throwing stuff away like that…..guess I should have thought about that before I bought it. Anyone have any good sources to buy them at a reasonable price?

View Ampeater's profile

Ampeater

391 posts in 2378 days


#4 posted 1964 days ago

Why don’t you give it a try and see what happens. I think that it would work fine if you were able to get them sharp without introducing any waviness into the edge of the blade. These planers can be adjusted to take a very heavy cut, so I don’t think it would be a problem if you only remove a few thousands.

-- "A goal without a plan is a wish."

View YorkshireStewart's profile

YorkshireStewart

1106 posts in 2532 days


#5 posted 1964 days ago

Before I got my ‘resharpenable’ blades, I regularly honed the disposable blade with diamond hones. They wouldn’t cope with a heavy re-grind, but as Ampeater says, a few thou is acceptable. I routed a slot in a length of hardwood to hold the blade snug & mounted the wood in the vice. The top was angled identical to the grind angle of the blades, thus giving me a guide for the diamond hone. There should be no risk of upsetting the balance if you’re removing such a small amount.

-- Res severa verum gaudium - True pleasure is a serious business. http://www.folksy.com/shops/TreeGems

View TimH's profile

TimH

36 posts in 2164 days


#6 posted 1964 days ago

Thanks for all the help. Yorkshire, I like you idea. I’ll give it a try.

View 8iowa's profile

8iowa

1489 posts in 2392 days


#7 posted 1963 days ago

I don’t know this for sure, but being designed to be disposable, the hardness of the edge may not go very deep in the steel, eliminating all but a light honing.

Even though my planer blades cost almost twice as much, they can be sharpened down a full 1/16”, giving me years of use. I have a jig that enables me to sharpen them on the conical disk sander, taking off just a few thousanths of an inch at a time.

-- "Heaven is North of the Bridge"

View Ampeater's profile

Ampeater

391 posts in 2378 days


#8 posted 1963 days ago

BIowa – What kind of jig do you have?

-- "A goal without a plan is a wish."

View brackett's profile

brackett

3 posts in 1963 days


#9 posted 1963 days ago

I wish you all the luck sharpening the blades. I ran into the same problem and needed new blades ASAP, so bit the bullet and bought new ones for around $30 on ebay. Best price I could find. However, there are services that sharpen in metropolitan areas that work a lot with knives. I called around and got a bid for about 46 cents an inch. Two 12.5 inch blades makes that price sound nice, but the dude wouldn’t do it while I waited, and the drive would have made up the cost.

If for any reason it doesn’t work out, I’ve heard that the hardened steel makes for great marking knives if you’re of the mind to put the sweat into cutting those puppies down.

Steve

-- Steve from the soil

View Handi75's profile

Handi75

371 posts in 2105 days


#10 posted 1963 days ago

Look on the net or woodworking sites for a Planer Blade Sharpening Jig.

I think the Blades are 15 or 20 Degree Bevel, can’t remember right off hand… I’ve seen a Sharpening Jig before, easily made out of a 2×4 I think it was, with bevels cut in it to hold 2 blades, and you sharpen it with a Sanding block at a 90 while the blades sit at a 15 to 20 in the jig.

I’m sure just a Light Sharpening should be suffice, I’m not 100% educated in Woodworking yet, still wet behind the ears, but I don’t see why it wouldn’t if it was a light sharpening.

Handi

-- Jimmy "Handi" Warner, http://www.facebook.com/HandisWorkshop, http://www.facebook.com/HandisCreations, Twitter: @Handisworkshop, @HandisCreations

View 8iowa's profile

8iowa

1489 posts in 2392 days


#11 posted 1963 days ago

ampeater:

It’s Shopsmith’s Planer/Joiner knife sharpener; http://www.shopsmith.com/ownersite/itemfind.htm?item=555471&Submit=Find+Item
I’ll never have to send knives to a sharpening service again.

I see that you are in Tipp City. Shopsmith is practically “next door” to you.

-- "Heaven is North of the Bridge"

View papadan's profile

papadan

1136 posts in 1999 days


#12 posted 1962 days ago

I have a Ridgid that uses the dispossable blades. They are reversable so they last a long time. My old blades become knife blades with a little regrind and handle additions. LOL

-- Carpenter assembles with hands, Designer builds with brains, Artist creates with heart!

View Bagman's profile

Bagman

2 posts in 1961 days


#13 posted 1961 days ago

Have the Dewalt too. To get a really good sharpening job around here was about the same as buying new blades (remember , you’re looking at 3 blades, 2-12.5 inch cutting surfaces per blade, which equals 75 inches of cutting surface) Even if you do your own sharpening IMHO you’ll have fewer problems simply buying new since you can’t adjust the position of the blade. Or sell the Dewalt and buy a new planer with regular blades.

View Deulen's profile

Deulen

37 posts in 1537 days


#14 posted 1418 days ago

Hello fellow woodworkers, The new! “Deulen Jointer/Planer Knife sharpening jig will sharpen throwawy planer knives as well as regular planer knives. They will remove nicks sharpen and hone to a razor sharp edge in minutes. Quit throwing them away. Send them to me and I’ll sharpen them in 15 minutes to a razor sharp edge. You can usually sharpen them two more times before tossing them. I’ve sharpened a set of 18” woodmaster throwaway knives twice now. They will sharpen longer knives by putting them end to end. You can get yours at: www.exoticwoodveneerplus.com or deulentools.com. Sincerely, Dan Deulen

-- Daniel M Deulen

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hammbone

5 posts in 945 days


#15 posted 945 days ago

YOU CAN SHARPEN THEM BY USING A THICK PIECE OF GLASS WITH FINE SAND PAPER ON IT .LAY THE BLADE FLAT ON ITS BACK AND MOVE IT AROUND THIS ALSO DOES NOT EFFECT THE HEIGHT AND WILL PUT A GOOD EDGE ON IT IDO THIS TO MY RYOBI BLADES HAVE NOT REPLACED THEM YET.

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