Jointer Malfunction/User malfunction

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Forum topic by justwingit posted 05-18-2019 01:42 AM 446 views 0 times favorited 8 replies Add to Favorites Watch
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25 posts in 292 days

05-18-2019 01:42 AM

Hey all I got this 6 inch delta jointer used. I ran a few boards 10-12 through it over the last few weeks sporadically. Tonight I ran a little walnut through it. I made one pass taking off a 1/4 inch maybe, then wanted to do a thin repeat pass, so I turned the dial down to what you see. Turned it on before I even got the wood set there was a pop/bang and I ran like hell. The 2nd photo is of what’s left of the jointer.
So 1. Should I throw it out or try to repair it (though my confidence is shaken)
2. Did I do something wrong – or maybe I did something wrong, what was it?
3. What new? jointer should I buy. Ie what’s the best value out there for entry level stuff. Is it really worth doing 8 inch over 6? Should I buy another used, Im a little concerned now….

Any criticism, help or opinions welcome!

8 replies so far

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25 posts in 292 days

#1 posted 05-18-2019 01:44 AM

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25 posts in 292 days

#2 posted 05-18-2019 01:44 AM

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3263 posts in 3188 days

#3 posted 05-18-2019 02:44 AM

I looks like the knife was properly secured. The last guy that put the knives in didn’t secure them. That is my opinion. Running isn’t a bad plan when things start coming apart. The jointer is probably the 2nd most important tool in the shop and I wouldn’t want to be without one. Bigger is always better as long as you have the space. The longer the bed the better the jointer will work for you.

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1426 posts in 952 days

#4 posted 05-18-2019 02:55 AM

If you had it cutting a 1/4”, it was a lot to ask of that little jointer. Multiple passes of a much finer setting would do the job and not damage the machine. Some power tools just don’t hold up very well to “hogging” the wood.

Whatever jointer you end up getting or, if you repair the one in your pictures, I would first get an operator’s manual for it and study it. Lots of good info in the manual and it should give guidance on things like safe operating practices and setting depth of cut, etc.

-- "I build for function first, looks second. Most times I never get around to looks." - Mike, western Colorado

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7480 posts in 2711 days

#5 posted 05-18-2019 03:02 AM

From the picture – it appears one of the screws holding the knife in place came loose and smacked the table.

To fix it, you might be able to bend back the knife lock bar and replace the screw… I don’t think the chip in the table will prevent you from using it – or at least it shouldn’t.


-- Brad in FL - In Dog I trust... everything else is questionable

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439 posts in 884 days

#6 posted 05-18-2019 03:54 AM

Looks like aluminum or magnesium alloy tables, could have been worse had it all been iron. The lock bar screw indicated by MrUnix was either loose or partly stripped. That way too heavy 1/4” pass on walnut finished it off, when you adjusted for the light pass and turned it back on the screw caught the edge of the table ripping a chunk out and twisting the lock bar back. Look under the jointer should be a well damaged screw there.

Probably not worth rebuilding a light jointer like that, that bearing may not be healthy any more either. Your table edges around the cutter head look worn, and I wouldn’t run the jointer with a hole like that near the cutterhead. If you can find a older North American made 6 or preferably 8” jointer, that would be my preference. If not maybe a Grizzly, Other US posters could give you better suggestions than I can.

If you rebuild you might want to read this first:

Scroll down to the bottom of the page.

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6389 posts in 1497 days

#7 posted 05-18-2019 04:10 AM

looks like the delta bench top I had years ago,definitely not designed to take 1/4” cuts in walnut.i think brad is right about the screw coming loose and causing the blow up.if this is the model I think it is id chuck it and move on and call it a learning experience.your lucky it could have been a lot worse.

-- sawdust the bigger the pile the bigger my smile-larry,so cal.

View justwingit's profile


25 posts in 292 days

#8 posted 05-18-2019 01:35 PM

Thank you all for your well thought out advice. I’ll let someone else have the jointer and get looking for a “new or new to me one”. and ill double check the screw tightness for sure, while im making much lighter passes. It didn’t seem to have a problem during the pass, but I guess that’s the craziness of power tools, they do so much and so quickly that they can DO lots of things, just sometimes they are things that are beyond the safety of the machine.
thanks all,

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