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Jointer set up question

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Forum topic by Craig posted 06-27-2011 05:05 AM 1067 views 0 times favorited 3 replies Add to Favorites Watch
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Craig

28 posts in 2046 days


06-27-2011 05:05 AM

Topic tags/keywords: jointer

I recently bought a used Jet jointer (JJ-6CSX) off craigslist and have been setting it up. I have the outfeed table set, the fence squared up but have a question about the blades. The outfeed table checks square and flat to the fence, using a one-way gauge base, no gap across the table perpendicular to the fence. When I set the blades parallel to the outfeed table, there is a pronounced “dip” between the jack screws, on the order of 0.003”, with the knives parallel at the screws. Is this a knife issue? The jointer came with a new set of knives that I haven’t replaced yet. I’ve been getting used to the jointer to figure out feed rate, hand pressure and all that, but the dip has me puzzled. This is my first jointer btw, so the help is appreciated.

Other than that, I’ve gotten the table and fence waxed, the knives are parallel to the outfeet table (at least at the jack screws) and the tables appear parallel (I need to get a better straight edge). Anything else to check? The jointer came with a new set of Jet knives and a mobile base, so if this dip isn’t an issue, I’m happy.


3 replies so far

View TomHintz's profile

TomHintz

207 posts in 2861 days


#1 posted 06-27-2011 08:30 AM

That could be simple wear if the previous user did not move the fence around when doing edge jointing. 0.003” is actually not that much for wear. I guess I would try the newer set of knives to see if that dip disappears. I suspect that it will. If that happens you can get the original knives sharpened to get rid of that wear.

-- Tom Hintz, www.newwoodworker.com

View philip marcou's profile

philip marcou

262 posts in 2059 days


#2 posted 06-27-2011 10:51 AM

Craig,
How did you arrive at .003”? If it is as little as you could simply joint the blades with a diamond or oil stone , by hand. (That is if I understand correctly what you mean by a “dip between the jack screws”).
You really do need to have a reliable straight edge when setting up a jointer-otherwise it is just time consuming trial and error….

View Sawdust2's profile

Sawdust2

1467 posts in 3550 days


#3 posted 06-27-2011 11:28 AM

Simple, inexpensive and accurate way to set your knives.

http://lumberjocks.com/projects/28505

Lee

-- No piece is cut too short. It was meant for a smaller project.

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