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Jointer knives shift after tightening screws

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Forum topic by Goodsh posted 04-22-2015 03:00 PM 809 views 0 times favorited 12 replies Add to Favorites Watch
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Goodsh

57 posts in 1387 days


04-22-2015 03:00 PM

Topic tags/keywords: jointer knives setting

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.


12 replies so far

View BroncoBrian's profile

BroncoBrian

435 posts in 1425 days


#1 posted 04-22-2015 03:11 PM

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.

-- Bigfoot tries to take pictures of me

View SirIrb's profile

SirIrb

1239 posts in 697 days


#2 posted 04-22-2015 03:25 PM

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

-- Don't blame me, I voted for no one.

View Aj2's profile

Aj2

692 posts in 1264 days


#3 posted 04-22-2015 03:27 PM

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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MrUnix

4241 posts in 1665 days


#4 posted 04-22-2015 03:31 PM

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

-- Brad in FL - To be old and wise, you must first be young and stupid

View pintodeluxe's profile

pintodeluxe

4859 posts in 2280 days


#5 posted 04-22-2015 03:40 PM

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.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View rwe2156's profile

rwe2156

2198 posts in 947 days


#6 posted 04-22-2015 03:57 PM

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?

-- Everything is a prototype thats why its one of a kind!!

View SirIrb's profile

SirIrb

1239 posts in 697 days


#7 posted 04-22-2015 04:39 PM

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


-- Don't blame me, I voted for no one.

View Ghidrah's profile

Ghidrah

667 posts in 689 days


#8 posted 04-22-2015 04:44 PM

I’ve been checking my planer and jointer knives after 5 minutes of use since I bought both just out of fear. Its been a ritual since the early 90s.

-- I meant to do that!

View Goodsh's profile

Goodsh

57 posts in 1387 days


#9 posted 04-22-2015 05:34 PM

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.

View rwe2156's profile

rwe2156

2198 posts in 947 days


#10 posted 04-22-2015 05:58 PM



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.

-- Everything is a prototype thats why its one of a kind!!

View rwe2156's profile

rwe2156

2198 posts in 947 days


#11 posted 04-22-2015 06:01 PM



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.

-- Everything is a prototype thats why its one of a kind!!

View BroncoBrian's profile

BroncoBrian

435 posts in 1425 days


#12 posted 04-22-2015 07:12 PM

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.

-- Bigfoot tries to take pictures of me

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