jointer giving me bows

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Forum topic by Bmitch79 posted 09-22-2015 03:27 AM 860 views 0 times favorited 5 replies Add to Favorites Watch
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2 posts in 1240 days

09-22-2015 03:27 AM

im having problems and i think (99% positive) its technique. I have watched every video possible and still getting the same result. I found a flat board just to practice with and some how ended up with a teeter totter board what am I doing wrong. Every board I joint ends up like this or a wedge shape. Thanks in advance

5 replies so far

View joey502's profile


535 posts in 1513 days

#1 posted 09-22-2015 01:06 PM

My first guess would be the knives are higher than the out feed table. I would suggest the use if a dial indicator to set the knives vs. a knife setting jig.

Second guess would be dull knives. How easily does the board cut? How deep is the cut?

View Fred Hargis's profile

Fred Hargis

4983 posts in 2488 days

#2 posted 09-22-2015 01:08 PM

I agree, it’s more likely the knives. Check the height relative to the outfeed table.

-- Our village hasn't lost it's idiot, he was elected to congress.

View jonah's profile


1696 posts in 3294 days

#3 posted 09-22-2015 01:51 PM

Are you transferring your downward pressure from the infeed side (at the beginning of the cut) to the outfeed side (at the end of the cut)? Once the board is far enough through to safely do so, you should be pushing down exclusively on the outfeed side of the cutterhead.

View pintodeluxe's profile


5654 posts in 2808 days

#4 posted 09-22-2015 05:24 PM

I would do a thorough evaluation of your jointer before blaming technique. Operating a jointer is pretty simple. One key point is to place the concave side of a rough board downward. This gives it two contact points, and will eventually straighten out.

Check that your infeed and outfeed tables are fully coplanar. Get them within .002” on all corners. Then make sure your blades are set flush with (or .001” above) the outfeed table. You need a quality straightedge at least 3’ long, and a feeler gauge to check this. There are really nice dial indicator tools to set your blades, but honestly I can set the knives with a straight scrap of lumber.

The wood whisperer is a good resource for jointer setup.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View Bmitch79's profile


2 posts in 1240 days

#5 posted 09-22-2015 08:09 PM

Thanks everyone, I’ve never used one up until I got this and not going to lie it’s frustrating me quite a bit. The blade height does make sense so I’m going to be checking that first. Thanks everyone

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