Jointer adjustment

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by flatboarder posted 10-22-2010 06:38 AM 1937 views 0 times favorited 6 replies Add to Favorites Watch
View flatboarder's profile


100 posts in 3367 days

10-22-2010 06:38 AM

Topic tags/keywords: jointer

I’m sorry people if this sounds redundant, but I’m still looking for someone that has the Delta DJ30 12” Jointer. It definitly does not work right when I set it up as per the owners Manual. Which states to set the out feed table at .015 above the cutter head body. And then set the knifes according to that. When I do this It beats the heck out of the bottom of the wood. Tear out, so on ans so on. Is there a basic common rule for setting straight knife on jointers. Certainly there has to be guide line for how far the knives should pertrude past the chip breaker. Im also curious about the angle at which the knife is striking the wood. Maybe there’s a test I can do to see where the knives are making contact with the wodd v’s where it should contact. Thanks for all your help I really do appreciate it so much. The knives are ground at 40 degrees is this common are abnormal?

-- Ive cut this board three times and its still too short?

6 replies so far

View childress's profile


841 posts in 4053 days

#1 posted 10-22-2010 05:51 PM

well, I don’t have a delta, but my manual say’s the table should be set .060 above so when the blades are in, it’s flush. Then if you sharpen, you need to lower the back table obviously. Probably different knives so the numbers might be different, but I can’t imagine a 45 thou diff. Why don’t you try to raise to .040 and set the knives flush with that and see what happens?

-- Childress Woodworks

View JJohnston's profile


1622 posts in 3802 days

#2 posted 10-22-2010 06:28 PM

I looked at the manual, and your machine is almost exactly the same as a Grizzly G0490 (which I have), except the Grizz is 8” wide and 4-knife. There is no mention in my manual of a particular height of outfeed table above the cutterhead; it only says the outfeed table must be parallel, crosswise, to the cutterhead and tangent to the knife arc. What I did initially was to leave the outfeed table where it was set from the factory, check it for parallel, then remove and reset the knives carefully to match it. If you like, I can measure the height this evening. In the meantime, try the .040 or even .060 and see what happens. What kind of measuring tools are you using? Can you describe your blade setting procedure?

Edit: I see you have a Oneway gauge. That’s what I use. Should be fine.

-- "A man may conduct himself well in both adversity and good fortune, but if you want to test his character, give him power." - Abraham Lincoln

View Lee Barker's profile

Lee Barker

2172 posts in 3361 days

#3 posted 10-22-2010 06:40 PM

Something’s wrong here.

What is your depth of cut? It sounds like you’re taking a pretty big bite.

In general theory, the knife height should be very close to the height of the outfeed table, and the infeed table about, say, a 64th below that.

The knives should be parallel to the outfeed table surface and the knives should all be the same height.

Going from those basic requirements, is there anything in what you have that doesn’t seem to fit?

-- " his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View RexMcKinnon's profile


2593 posts in 3706 days

#4 posted 10-22-2010 06:51 PM

Go to see EP 118 on TheWoodWhisperer website. He goes in depth on jointer setup.

-- If all you have is a hammer, everything looks like a nail!

View flatboarder's profile


100 posts in 3367 days

#5 posted 10-23-2010 01:18 AM

I believe that someone damaged the cutter head by torquing down too much on the locking bar screws. When the machine first got here i checked everything pout with my one way multi gauge” sounds like an advertisment dont it” here is what I found. The cutter head body was tweeked so hard that with the dial gauge sitting on the cylinder at the very back of the solid part in between the knives it started at .033 and when I turned the cutter head with the noe way gauge still making contact it would rise to .038 and .039. It was the same accross the width ot the cutterhead plus or minus .002 but no more that .002. I had to loosen the gib screws with a 21” cheater bar. I believe that because I’m not even remotlely make the screws that tight, so the chattering on the bottom of the stock is probaby from the knives flexing in the cutter head body. Delta is sending me a new cutter head. The have been real goodso far. Still the majic question is one that I will just have to play with until I find the sweet spot.

-- Ive cut this board three times and its still too short?

View Doer's profile


22 posts in 3334 days

#6 posted 10-27-2010 10:25 PM

I have a 1960’s model Powermatic Jointer and my manual also stated that the blades should extend just a short distance from the cutter head (which is the same thing as setting your outfeed table .015 above the cutterhead and setting the knives level with the outfeed table. When I did this, the wood contacted the adjusting screws for the knives. I raised the blades (and the outfeed table), problem solved and I have been running this machine for 30 years. I think the manufacturer wants us to keep the extruding portion of the knives as low as possible, but when our product rubs the head, muy no bueno.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics