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My jointer has the springs for setting height and I have successfully set the knives twice now but after limited use it seems like the knives are getting pushed down further and the blades are now lower than the outfeed table (originally set ever so slightly above the outfield). The first time it happened I thought it was perhaps because I hadn't done a good enough job of cleaning of the oil from the knives after delivery so they were able to slide down even after tightening but now it has happened again. How tight should I make the bolts? I thought I tightened it as much as I could but maybe my wrench is too short and I don't have enough leverage to make it tight enough.
 

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I strongly suggest watching this video for jointer setup:

http://www.thewoodwhisperer.com/videos/jointer-setup/

I bought the One-way gauge Marc suggested and it is awesome! I am a perfect .0015 across the length of the cutterhead. Watch the entire video or jump to about 23 min where he starts the blade setup. My jointer is now perfect on the cutterhead, and within .0001" across the length of the tables for coplaner.
 

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1. Clean everything.
2. tighten the knives semi snug-1/32 turn with a wrench.
3. using a wooden mallet and dial indicator, GENTLY tap the knives down to 0.

I have and you can stone the knives level to the outfeed table if they are high (high being .001 -.002). I wrap half the stone with paper and set the paper wrapped part on the outfeed table. Set the infeed table to the same plane as the outfeed table. Then clamp a board about 2 inches from the cutterhead on the in feed table. start the jointer and slowly lower the stone while against the board then draw it side to side. It will damage the stone and maybe your fingers if you are careless. The lowering is like closing an angle: you have the end of the stone on the outfeed table at 45 degrees and lower the "open" end towards the infeed table…slowly. It is scary.

#LoveYourJointer
 

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Are you sure the knives are pushed down? Maybe they are just dulling faster than you would like.My first jointer was a craftsman with outfeed table fixed,The knives were very plain carbon steel and dulled quickly,took me sometime to figure this out.Aj
 

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Doubt they are slipping down… sounds like normal wear. Particularly noticeable on newly sharpened knives where the thin leading edge is worn down rather quickly.

Cheers,
Brad
 

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It sounds like something is amiss. I have never had to reset my jointer knives between sharpenings. I use the jointer pal, which is a simple magnetic jig to set the knives. I use a sturdy wrench that I ground thinner to fit in the cutterhead slots. The tiny wrenches made for tightening jointer blades are pretty flimsy.

Ultimately, the quality of the cut will tell you what to do. If your knives are lower than the outfeed table, the board will hit the outfeed table nearly every time. This must be adjusted for by either lowering the outfeed table a small amount, or resetting the knives.
 

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Obviously the nuts are not tight enough.

I think you're on the right track about a possible wrench issue.

On both my jointer and my planer (Grizzly) I've had problems with regular wrenches because they are too wide to fit in the slot to tighten the nuts so I ground the sides down because I had extra 12mm wrenches.

Its possible to have the wrench get wedged between the bottom and the nut as you tighten and this will feel like its tight, when in fact it is not.

....now why do I know this?
 

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for the nuts not to be tight-that sounds like the accident of the year about to happen. Knife fly out?
Obviously the nuts are not tight enough.

I think you re on the right track about a possible wrench issue.

On both my jointer and my planer (Grizzly) I ve had problems with regular wrenches because they are too wide to fit in the slot to tighten the nuts so I ground the sides down because I had extra 12mm wrenches.

Its possible to have the wrench get wedged between the bottom and the nut as you tighten and this will feel like its tight, when in fact it is not.

....now why do I know this?

- Robert Engel
 

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Discussion Starter · #10 ·
Thanks for the responses. Normal wear and tear would make the most sense and I hadn't even thought of that (duh). I had a hard time thinking they weren't tight enough (which, yes, was a scary thought!).

What's normal for wear on new knives? These were new from the manufacturer (Rikon) when I initially set them. Maybe they're really cheap. After initially setting them I used them for maybe 30 bd ft and then had to reset them because they were lower than the outfeed. After resetting them I ran maybe 20 bd ft and they were fine, let the jointer sit for a few months without using it and then ran another 20 ft and now they are lower than the outfeed table again (board is jamming against the table). I set them to be about .003 above the outfeed table both times. When initially set everything works great but over time boards start getting tapered and then hitting the outfeed table. I'm going to set them again but I sure hope this is the end of it. I've spent more time setting the knives than I have using them.
 

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for the nuts not to be tight-that sounds like the accident of the year about to happen. Knife fly out?

Obviously the nuts are not tight enough.

I think you re on the right track about a possible wrench issue.

On both my jointer and my planer (Grizzly) I ve had problems with regular wrenches because they are too wide to fit in the slot to tighten the nuts so I ground the sides down because I had extra 12mm wrenches.

Its possible to have the wrench get wedged between the bottom and the nut as you tighten and this will feel like its tight, when in fact it is not.

....now why do I know this?

- Robert Engel

- SirIrb
The won't fly out unless they are really loose the slot is tapered.
 

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Thanks for the responses. Normal wear and tear would make the most sense and I hadn t even thought of that (duh). I had a hard time thinking they weren t tight enough (which, yes, was a scary thought!).

What s normal for wear on new knives? These were new from the manufacturer (Rikon) when I initially set them. Maybe they re really cheap. After initially setting them I used them for maybe 30 bd ft and then had to reset them because they were lower than the outfeed. After resetting them I ran maybe 20 bd ft and they were fine, let the jointer sit for a few months without using it and then ran another 20 ft and now they are lower than the outfeed table again (board is jamming against the table). I set them to be about .003 above the outfeed table both times. When initially set everything works great but over time boards start getting tapered and then hitting the outfeed table. I m going to set them again but I sure hope this is the end of it. I ve spent more time setting the knives than I have using them.

- Goodsh
I've never heard of knives wearing that much that fast.
I've replaced and used knives in my jointer for 25 years and never had to adjust the outfeed table because the knives wore down.

I wonder if you've got issues with the tables getting out of adjustment.

Try some better quality blades, but I can't see how that's the problem.
 

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Watch that video. There might be screws below the knives that keep them from pushing back in. Not familiar with that jointer but most knives install the same way.

Robert's nut suggestion is also a good one. You might think they are tight but be wrong.
 
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