Large Taper when jointing

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Forum topic by FMG posted 01-22-2012 05:25 PM 1215 views 0 times favorited 5 replies Add to Favorites Watch
View FMG's profile


65 posts in 3522 days

01-22-2012 05:25 PM

Topic tags/keywords: question walnut milling joining

Hey everyone. I am excited to be back in the shop more and more lately. I bought some air dried rough cut lumber with the live edge still on it, and started to dimension it last night. Very exciting! Very frustrating also. While practicing on a less desirable pieces I had to take a bow out and on the joiner took it down about 1/4” by the end I had 1” on one end and 3/4” of thickness on the other, even after alternating feed ends. I’m sure it’s my technique but not sure what I’m doing wrong. Any ideas?

-- FMG- Woodworking is 90% mental the other half is physical

5 replies so far

View doncutlip's profile


2832 posts in 3797 days

#1 posted 01-22-2012 05:30 PM

There have been several threads on this, and the general consensus is that if you keep running a board through a jointer on one side you are going to get taper no matter what.

-- Don, Royersford, PA

View Peter Oxley's profile

Peter Oxley

1426 posts in 4116 days

#2 posted 01-22-2012 05:41 PM

Yeah, doncutlip is right. Your jointer makes flat faces, your planer makes parallel faces. If the jointer could make parallel faces (i.e. no taper), you wouldn’t need a planer.

-- -- --

View Chipy's profile


374 posts in 2834 days

#3 posted 01-22-2012 06:24 PM

I like to joint one face then use a board with a nice straight edge and clamp the rough cut board to it and run it through the table saw first.Its a pretty crude drawing so hope you get my drift?

View casual1carpenter's profile


354 posts in 2717 days

#4 posted 01-22-2012 06:27 PM

FMG, A couple of questions.

How long are the infeed outfeed tables on your jointer?
How long is / are the boards in question?
How was the bow positioned in relation to the cutter / tables?
If the bow was positioned so the crown was up along the length, how hard did you press downward?

There are some really good guys on here and as Don said there are quite a few threads here.

The hand plane guys could probably understand your technique issues better, if the lumber is longer than your infeed table. BTW, you should check coplaner on your tables and the knives to outfeed table relationship.

View JohnnyM's profile


39 posts in 2574 days

#5 posted 01-22-2012 06:50 PM

I like the jointer for shorter pieces, less than about 3’. Anything longer I run through my table saw against an 8’ piece of MDF so the entire piece is against the MDF and the MDF is sliding against the fence. Similar idea to Chipy’s but I do not clamp it. Just keep the butt ends even as I feed it. I always start with the concave side to the mdf first to prevent rocking while I am feeding.

-- ~~ John . . . . . . . . . Against the Grain Woodworking & Design, LLC

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