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HELP!!! Jointer Set-up

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Forum topic by John_G posted 02-16-2017 02:23 AM 660 views 0 times favorited 7 replies Add to Favorites Watch
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John_G

165 posts in 2530 days


02-16-2017 02:23 AM

Topic tags/keywords: jointer machines alignment

Hello Everyone.

I’m having a real problem getting my jointer all set up again. I’ve had it working just fine in the past. I took the knives off and sharpened them and put them back in. Now when i run a board through it ramps up and comes off the bed of the out feed table. This causes it to rock slightly and stop cutting. I though maybe the beds were out of alignment so i used a level (the straightest thing i had) and thought that the front of the infeed was about .011 lower which would cause the ramping. I added some blue tape just to see if it helped. The knives are flush with the out feed table. It’s still ramping when i run a board through it. i’m at a loss as to what to try. We had this jointer for years at my parents house and had the exact same problem. I though i had it fixed by making the knives flush with the out feed table but now it’s back again. Are they supposed to be slightly higher, slightly lower, perfectly even????

Any helps, ideas, and advice you all could give me would be greatly appreciated.

Thanks Everyone.
John Gray

-- John Gray


7 replies so far

View TungOil's profile

TungOil

747 posts in 334 days


#1 posted 02-16-2017 02:40 AM

I set my jointer knives just slightly above the outfeed table height. Just high enough that the knife will lift a straight edge laid on the outfeed table and move it about 1/16” when the cutter head is rotated (by hand of course!). Check this in several places across each knife, if you sharpened your own knives the edge might be slightly out of true.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

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Aj2

1178 posts in 1637 days


#2 posted 02-16-2017 02:19 PM

You may have added too much sharpness angle to the knives.If your bevel angle starts going past 45 the heel of the bevel starts hitting the wood.
That’s my guess since you have checked the setting of the machine carefully.
My first jointer was a craftsman with the fixed outfeed table.Talk about aggravation!
Good luck

Aj

-- Aj

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MerylL

70 posts in 1210 days


#3 posted 02-18-2017 05:38 AM

I’m going to suggest something not necessarily intuitive: Look up and download the PDF Manual for a jointer. I bought a used Jet JJ-6csx jointer. The PDF has an excellent section on how to set up that jointer. While the actual “screws, knobs and bolts” will be different, the CONCEPT is solid across any model. I had to undo some damage on mine, including deep rust of the cutterhead and blades. I self-sharpened using a Deulen jig. I have given it some use since, and it is a beauty. My first jointer, btw. I milled down a band-sawed piece of maple firewood for a gauge for adjusting the (also damaged) planer I got cheap in that same sale. It milled off a ton of maple with ease. Let us know!

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JBrow

1275 posts in 759 days


#4 posted 02-19-2017 12:48 AM

John_G,

If all three knives are set even with the outfeed table across the width of the outfeed table, as described by TungOil and the heel of the bevel does not rise above the outfeed table, as described by Aj2, then I can only think of one other cause. The infeed table could be angled and thus not co-planar with the outfeed table. If the infeed table is higher at the cutter head than at the opposite end of the infeed table, this slight angle might produce the affect you are seeing.

Coplanar outfeed/infeed tables can be checked reasonably accurately with a straight 4’ (or better yet, 6’) level. The infeed table could be raised so that the infeed table is even with the outfeed table at the cutter head. After moving the knives out of the way, the level should set flat and in full contact with both the infeed and outfeed tables all along the infeed table. One end of the level should be positioned as close to the end of the infeed table as possible while remaining on the immovable and un-adjustable outfeed table. If the level rocks anywhere across the width of the bed or daylight is seen under the level on the outfeed table, then the infeed table is not co-plane with the outfeed table.

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John_G

165 posts in 2530 days


#5 posted 02-19-2017 09:33 PM

thanks for all your suggestions everyone. i ended up just moving the knives up a bit just like TungOil suggested and that seems to have fixed it. I think there’s still an alignment issue with it but moving thing up just a hair seems to have either solved that or just covered it up. Either way things are coming off it 90deg now and NOT ramping up up the end of the outfeed table.

-- John Gray

View Aj2's profile

Aj2

1178 posts in 1637 days


#6 posted 02-20-2017 01:32 PM

Good to hear nice catch ting oil.
Might want to start looking for a jointer with a adjustable outfeed table.That way you can lower the outfeed table esp when the knifes start getting dull but still cut.
I had a similar jointer for many years before the Internet.Theres no need to suffer anymore :)

Aj

-- Aj

View JohnDon's profile

JohnDon

66 posts in 1008 days


#7 posted 02-21-2017 12:13 AM

Get a copy of “Care and Repair of Shop Machines” by John White. He gives a practical, clear, and extensive description of jointer setup and adjustment, along with other woodworking equipment. I can’t recommend the book highly enough.

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