Understanding funtion of jointer table gibs

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Forum topic by Woodyvolt posted 04-05-2018 12:48 AM 6694 views 0 times favorited 4 replies Add to Favorites Watch
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81 posts in 1401 days

04-05-2018 12:48 AM

I have a JJ6CSX Jet jointer. The infeed table is hard to change and I have recently broken and replaced the yoke that lowers and lifts the table. I have cleaned and lubricated all parts that could be causing the problem with no change. The problem is not the table lock as I have checked that.

The only conclusion that I have, is that the problem could be the table gibs which I don’t have a clear understanding of their function.

My question is what is the function of the gibs, how do you set them, and physically how do they cause the table to change position. Are they shaped to make these changes?

Hope my description is clear in what I am trying to better understand.


4 replies so far

View Richard Lee's profile

Richard Lee

438 posts in 2015 days

#1 posted 04-05-2018 12:59 AM

Pictures would help,but if your gib screws are tight you can break things trying to adjust the table.
Gibs are usually secured with set screws.
There are 2 types of gibs tapered and straight,straight gibs will have screws perpendicular to the gib and tapered will have an adjusting screw on either end of the gib.

The pic is a straight gib style.

View Aj2's profile


4066 posts in 3038 days

#2 posted 04-05-2018 03:21 AM

The gib screws should be tight but not so tight that you cannot move the tables. They are not for adjusting table coplaner although they sometime do affect it. And that a whole different kettle of fish.
Dovetail way jointers should never be lifted from the ends of the tables but many do.
Look for another jointer if your tables dont line up with the gibs adjusted right.

-- Aj

View Loren's profile


11269 posts in 4888 days

#3 posted 04-05-2018 03:33 AM

The gibs on one side at least serve as a buffer
so the set screws don’t gall the soft iron of
the dovetails. The gibs are hard steel. I had
a jointer with gibs on only one side, where
the screws were. They compensate for wear
and manufacturing variances. The gib adjustment
screws shouldn’t be cranked down super tight.
If they need to be cranked down to remove
play in the table then there’s another problem
that would probably be best addressed with

View Woodyvolt's profile


81 posts in 1401 days

#4 posted 04-06-2018 02:10 PM

Thanks to all that helped. I spent some time with the jointer yesterday and got it in good working condition. The information provided gave me an understanding of the gibs and settings. I had them cranked down too hard causing my problem.

The picture gave me a much better understanding of the parts of the areas that I was having a problem with.

Thanks again.

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