Jointer trouble - DJ 15

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Forum topic by DavidTTU posted 04-11-2017 10:13 PM 971 views 0 times favorited 8 replies Add to Favorites Watch
View DavidTTU's profile


141 posts in 1784 days

04-11-2017 10:13 PM

Topic tags/keywords: delta jointer dj 15 fence out of square delta fence out of square

I have a Delta DJ-15 Six ” jointer. I am having a hard time getting my fence set up square. I am trying to isolate the problem so as not to move forward and create two problems by diagnosing this wrong.

The problem- My jointer fence is only square to the infeed or the outfeed table.

Some pictures illustrating the problem. The fence was set square to the infeed table for these pictures. Sorry if the pictures are not clear enough to see.

Square showing the infeed side is square to the fence at the furthest end of the table.

Square showing the infeed side is square to the fence near the cutter head.

Square showing the outfeed side is not square to the fence near the cutter head

Square showing the outfeed side is not square to the fence at the furthest end of the outfeed table.

I have checked both the tables and the fence for twist. I checked the tables using winding sticks and could not spot any visible twist. I checked the fence for twist using an accurate machined straight edge and feeler gauges. I could not locate any twist, but I am not sure if that is the appropriate way to gauge it.

I have noticed that the fence drags in one specific spot on the table. Does anyone know if this is normal?

Here are two photos showing this.

I have checked the tables for coplaner and they seem set up correctly. Again using a straight edge and a set of feeler gauges. I would be happy to try anything again if someone has a suggestion.

Finally here is the problem shown in reverse. This time the fence was set square to the outfeed table.

Set square to the outfeed table

-- -David -- Lubbock, TX

8 replies so far

View TheFridge's profile


10351 posts in 1634 days

#1 posted 04-11-2017 10:16 PM

I’d worry about it at the head and at the end of the outfeed toable.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View DavidTTU's profile


141 posts in 1784 days

#2 posted 04-11-2017 10:17 PM

Fridge are you saying to set the fence square at those two points? and not worry about it being square to the infeed as much?

-- -David -- Lubbock, TX

View Aj2's profile


1730 posts in 1946 days

#3 posted 04-11-2017 10:48 PM

That’s how I set my fence – square to the out feed table just past the head.Then apply pressure there when jointing a edge.
Good luck

-- Aj

View DavidTTU's profile


141 posts in 1784 days

#4 posted 04-12-2017 01:18 PM

Thanks AJ. I tried setting the fence to the outfeed table and I am still not getting square results.

-- -David -- Lubbock, TX

View HokieKen's profile


6298 posts in 1287 days

#5 posted 04-12-2017 02:39 PM

What you ultimately need, is the fence square to the cutters. If you set your fence square to the outfeed and it’s square down the full length of the outfeed table, then your cutter and your outfeed table may not be coplanar. If that’s set right, then you may have some flex in your fence mechanism that’s allowing it to move out of square when you apply pressure.

-- Kenny, SW VA, Go Hokies!!!

View DavidTTU's profile


141 posts in 1784 days

#6 posted 04-12-2017 03:36 PM

Thanks Kenny! I will look into those two ideas.

-- -David -- Lubbock, TX

View pintodeluxe's profile


5757 posts in 2961 days

#7 posted 04-12-2017 06:15 PM

I would suggest a detailed re-check of the whole system, not just the fence.

1. First make sure the fence is flat within .005” with a quality straightedge. Check in a straight line and check diagonally. If the fence is warped or bowed, no other adjustment will fix it. If you pass this test, go to the next step.

2. Second check the jointer tables for coplanar within .002-.004”
The tables adjust individually at all four corners (eight corners in all). Imagine two toy aircraft carriers floating in a bathtub. If the water is flat and calm you could put a fence on both boats and it could be set square.
However if you push down on one corner of one boat, you will not read square on one boat.

If you don’t pass this test, reset your jointer tables to coplanar. Make sure the knives extend the appropriate distance from the cutterhead (straight knife models only, does not apply to helical heads). I recommend thewoodwhisperer videos, but there are many good resources.

3. You can do a lot better than the pictures you show. However when you are adjusting, I wouldn’t worry about dead perfect. If the fence is straight within .005 and the tables are within .002-.004 at most, then it will never translate to being out of square on your workpiece. Ultimately that is my goal, a flat and square workpiece.

Good luck!

p.s. while you’re at it check your square for square! The old trick of drawing a line, flipping the square and drawing another line has revealed many of my old squares as faulty.

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

View DavidTTU's profile


141 posts in 1784 days

#8 posted 04-12-2017 08:58 PM

Thanks for the help Willie. I will go back and try all of that. I will check back in tomorrow and let you know how it goes.

-- -David -- Lubbock, TX

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