New Jointer Knives?

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Forum topic by jasonallen posted 12-18-2013 03:49 PM 1547 views 0 times favorited 9 replies Add to Favorites Watch
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192 posts in 1861 days

12-18-2013 03:49 PM

I bought a Rockwell 6 inch jointer at a garage sale awhile back. It is pretty old but in good working order. Except for the knives. They are terrible. They are chipped really bad and it looks like someone tried to sharpen them but failed miserably because they are also curved from side to side. It is totally unusable. I have heard that replacing the knives is pretty difficult. Any tips or suggestions?

-- Skill and confidence are an unconquered army.

9 replies so far

View MT_Stringer's profile


3183 posts in 3472 days

#1 posted 12-18-2013 04:06 PM

Did you check ereplacement

-- Handcrafted by Mike Henderson - Channelview, Texas

View horsch's profile


42 posts in 2906 days

#2 posted 12-18-2013 04:23 PM

Infinity sells jointer knives in a variety of lengths and thicknesses. You might be able to find something that would fit there. Amazon also seems to have quite a variety. Good luck.

View muleskinner's profile


928 posts in 2677 days

#3 posted 12-18-2013 04:42 PM

Not that difficult. Usually the hardest part for an old machine is getting the old knives out. You’ll need a slim open end wrench to get to the locking bolts. Generally clockwise to loosen. Lots of sources for replacement knives (Amazon is a good place to start). If I remember correctly those old Delta/Rockwells take a 6 1/8×5/8×1/8 knife. Measure the old ones to make sure.

-- Visualize whirled peas

View DaddyZ's profile


2475 posts in 3281 days

#4 posted 12-18-2013 04:45 PM

-- Pat - Worker of Wood, Collector of Tools, Father of one

View jasonallen's profile


192 posts in 1861 days

#5 posted 12-18-2013 08:28 PM

Is there anything difficult about getting the new knives back in correctly? That is the main thing I am worried about.

-- Skill and confidence are an unconquered army.

View muleskinner's profile


928 posts in 2677 days

#6 posted 12-19-2013 12:48 AM

I have an older Delta/Rockwell 6” jointer that in all likelihood is similar to yours.(I don’t think they’ve really changed much over the years) Never had any problem getting the knives back in. Takes a little fiddle faddling around to get them set right once they’re in, but nothing overwhelming. Google ‘setting jointer knives’ and you’ll get a ton of instructions and techniques. Good luck.

-- Visualize whirled peas

View Planeman40's profile


1332 posts in 3002 days

#7 posted 12-19-2013 05:51 AM

I have a Rockwell (Delta) 6 inch jointer and love it! The trick to changing jointer knives is to leave the adjustable blade leveling screws alone. Jointer knives are a set and each knife in the set is ground so that the blade height is exactly the same on each knife. Also, when jointer knives are professionally sharpened, the exact same amount is ground off on each blade to retain the common blade height. Just take the old blades out and insert the new ones in and tighten good. Then use a steel straightedge to check the outfeed table to make sure it is at the same height as the knives. If not, adjust to make it so.

When you monkey with the blade height adjustment screws, that is when you have to go to a lot of trouble to re-set each blade height with a dial indicator. A real pain, but not too bad.

One last comment. Be SURE to cover each new blade edge with two layers of masking tape before installing. These blades are razor sharp and one little slip in tightening the blades down can give you a deep gash in the hand!


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

View Holbs's profile


2041 posts in 2270 days

#8 posted 12-19-2013 06:00 AM

take a peek at my jointer cleanup blog. i have a 6” rockwell delta jointer as well. it was oddly… a fun experience to take everything apart (knives included), clean it all out, and put back together. i did have to grind down a open box wrench so it would fit into the knife holding bolt cavity.

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

View jasonallen's profile


192 posts in 1861 days

#9 posted 12-20-2013 05:13 AM

Thanks for all the information.

-- Skill and confidence are an unconquered army.

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