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Forum topic by alumitim posted 01-21-2014 02:50 AM 1065 views 0 times favorited 20 replies Add to Favorites Watch
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alumitim

21 posts in 1084 days


01-21-2014 02:50 AM

Topic tags/keywords: jointer joinery

I am very recent into woodworking. I purchased a used Craftsman 4” jointer on craigslist and tonight I attempted to use it for the first time (after much research). I am using aspen that is 2” thick. The problem that I am running into is that when I attempt to joint the edge of a board it is finishing out with an arch in it (Cutting more in the middle and not as much on either end). I checked the knife adjustment and infeed/outfeed table adjustment. They seem to be good. I am fairly certain that it is technique related, but I am not sure. Any help is greatly appreciated.

-- Tim


20 replies so far

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paxorion

1102 posts in 1510 days


#1 posted 01-21-2014 03:09 AM

Sounds like either snipe or a table co-planer issue. http://www.newwoodworker.com/jntrprobfxs.html

-- paxorion

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jerif

17 posts in 1063 days


#2 posted 01-21-2014 03:15 AM

Sounds like your diagnosis is correct, if the tables and knives are properly adjusted, it must be your technique. There is a learning curve with a jointer, I know because I’ve made the same errors.

Make sure you are not putting so much downward pressure on the boards that you are bowing them. Also make sure that after the first couple inches, the downward pressure is concentrated onto the out-feed table.

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alumitim

21 posts in 1084 days


#3 posted 01-21-2014 03:22 AM

Thanks, I will give it another shot. I decided to learn on a finish piece (smart I know). Maybe I will get some scrap and try to figure it out. The piece I am using is 9” wide and 2” thick so I don’t know if I am bowing it, but I very well may be applying too much pressure to the in-feed table.

-- Tim

View tefinn's profile

tefinn

1222 posts in 1902 days


#4 posted 01-21-2014 03:33 AM

How long is the board you’re trying to joint? That planer has a max board length for optimum jointing/planing of about four feet. Most likely though it is your technique. Start with pressure on the infeed and as the board goes onto the outfeed transfer the pressure to there.

-- Tom Finnigan - Measures? We don't need no stinking measures! - Hmm, maybe thats why my project pieces don't fit.

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Craftsman on the lake

2523 posts in 2902 days


#5 posted 01-21-2014 03:34 AM

Since a jointer is used to get one edge straight so it can be put through a saw with the straight edge against the table saw fence, it’s important to put the right edge in. It could be, from your description that you’re putting the wrong side down maybe??? When jointing the bow should be up in the middle. The wood would enter with the tips pointing down. The ends will get cut and eventually with a few passes it will cut so that the middle gets hit too. When that happens that edge is flat.

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.

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alumitim

21 posts in 1084 days


#6 posted 01-21-2014 03:44 AM

The board is only 21” long. The opposite edge of the board is a live edge. I am glueing it up to make a nightstand top.

-- Tim

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Nubsnstubs

826 posts in 1195 days


#7 posted 01-21-2014 03:53 AM

Your outfeed table needs to be adjusted… If it’s a 2×9” board only 21” long, you’re not bending the board. Adjust your outfeed table to your knives. I know how to set it up properly, but can’t explain it…...... Jerry (in Tucson)

-- Jerry (in Tucson)

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tefinn

1222 posts in 1902 days


#8 posted 01-21-2014 03:55 AM

Then it is one of two things. Your technique as mentioned above or the planer blades are set wrong. On your planer the only table that moves is the in feed. The outfeed is not adjustable. Make absolutely sure the blades are even with the outfeed across the width of the blades. If they’re too high it will cause the problem you’re having.

-- Tom Finnigan - Measures? We don't need no stinking measures! - Hmm, maybe thats why my project pieces don't fit.

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alumitim

21 posts in 1084 days


#9 posted 01-21-2014 04:37 AM

There does seem to be height adjustments on the outfeed. I think they designed it that way because the knife height isn’t adjustable. I will check that out in the morning.

-- Tim

View BilltheDiver's profile

BilltheDiver

250 posts in 2350 days


#10 posted 01-21-2014 06:04 AM

I would also suggest you make sure the tables are coplanar. Put a straight edge across the length of both tables (without touching the knives) and raise the infeed table until the straight edge is on both. Then make sure the tables line up from one end to the other. If not you need to adjust them or you won’t ever get it right.

Watch “The Jointer’s Jumpin” by The Wood Whisperer” on youtube. It might help a lot.

-- "Measure twice, cut once, count fingers"

View ohtimberwolf's profile

ohtimberwolf

634 posts in 1817 days


#11 posted 01-21-2014 02:10 PM

This may be the video Bill was talking about, if not it may still help. larry

http://www.youtube.com/watch?v=gO746cuRqV4

-- Just a barn cat, now gone to cat heaven.

View Bluepine38's profile

Bluepine38

3341 posts in 2550 days


#12 posted 01-21-2014 03:28 PM

Alumitim, you said that the knife height isn’t adjustable. The knife height has to be adjustable, so hopefully
you just mistyped.

-- As ever, Gus-the 77 yr young apprentice carpenter

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alumitim

21 posts in 1084 days


#13 posted 01-21-2014 03:52 PM

I will take a look at it again tonight. I may be incorrect on that. There are height adjustments on the outfeed though. I am sure of that.

-- Tim

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Steve

16 posts in 3218 days


#14 posted 01-21-2014 08:57 PM

I recently watched the video ohtimberwolf is talking about. Great informative video.

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alumitim

21 posts in 1084 days


#15 posted 01-22-2014 12:46 AM

That is a great video. Thanks for sharing. My jointer is a craftsman model 103.23340. The infeed and out feed table is adjustable but the knife wheel isn’t. I am currently downloading an official craftsman manual online to do proper adjusting.

-- Tim

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