Unwanted bows in a jointer

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Forum topic by Konomigon posted 01-01-2010 09:49 PM 1713 views 0 times favorited 6 replies Add to Favorites Watch
View Konomigon's profile


55 posts in 3194 days

01-01-2010 09:49 PM

HI All and Happy New Year!

I am having a problem with my jointer. Its a small six inch delta bench top model, JT160 I think. Anyway, it seems to cut very smooth, but the problem is that I cannot get a flat edge. When I put two jointed edges together there is up to a 1/16 inch gap in the middle. The ends seem to meet up though.

It seems to work ok with smaller lenghts, about 15 inch boards, but I’m trying to joint boards for a table top, maybe 50 inches long. Is this too long?

Any suggestions???

Thanks in advance!

-- Kris

6 replies so far

View Russel's profile


2199 posts in 3907 days

#1 posted 01-02-2010 12:27 AM

I have a Delta benchtop jointer as well, and I’ve found that 50 inches is too long. There just isn’t enough consistent support to get a good edge. I haven’t had reliable results with anything over 36 inches.

-- Working at Woodworking

View Konomigon's profile


55 posts in 3194 days

#2 posted 01-02-2010 06:01 AM

Thanks for the advice. I kind of had a feeling that this was the case :(

-- Kris

View skidiot's profile


73 posts in 3613 days

#3 posted 01-02-2010 06:24 AM

There was a thread the other day about this problem. They said if you carefully set up a roller stand on each end of your jointer you can joint boards of any length.

-- skidiot northern illinois

View Konomigon's profile


55 posts in 3194 days

#4 posted 01-02-2010 06:29 AM

Thats a great idea! I have been meaning to get some of those for other uses too. The only problem I have is that basement/workshop is very uneven. It is an old dirt basement that the previous owners had bricked and then very hastily covered with a very thin layer of cement. I think I could find a good place for it with some shims and a careful setup.

-- Kris

View patron's profile


13600 posts in 3309 days

#5 posted 01-02-2010 06:38 AM

check your outfeed table ,
if it is not dead on with the cutterhead ,
it wont cut absolutely flat .
to high , and the wood is crowned in the middle ,
to low , and it is bowed in the middle

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View bhack's profile


349 posts in 3688 days

#6 posted 01-02-2010 06:45 AM

I have the same machine. As patron said the first thing to check is the cutters even with the outfeed. I aligned mine with a dial indicator and get very good joints. If the board is longer than thirty inches or so be sure to keep constant pressure (on infeed and outfeed) while feeding.

-- Bill - If I knew GRANDKIDS were so much fun I would have had them first.

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