Reply by coloradoclimber

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Posted on Problem: Jointing with router

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548 posts in 4845 days

#1 posted 07-31-2007 12:13 AM

I’d suggest a couple of things.

Number 1: Only joint / plane the length you need (plus a couple inches for cleanup on the ends).

If you have an 8 foot board with a 1/2 inch bow in the middle you have to joint out a 1/2 inch of material to get a straight edge. If you take that same 8 foot board and cut it into 4 2 foot pieces the 1/2 inch of bow is going to be distributed (probably not evenly) across the 4 boards. But for this discussion let’s say the 1/2 inch gets evenly distributed over the 4 2 foot boards so now you only have to joint out 1/4 of the 1/2 inch of bow or about 1/8 of an inch of material per board. The result is you would end up with 4 2 foot pieces that are 7 and 7/8 ‘ish wide instead of 1 8 foot board that is 7 and 1/2 ‘ish inches wide. Then you’ll end up ripping the other half of the bow off at the table saw so double those waste numbers.

Number 2: You are limited in the length of board you can joint by the length of your jointer table, or in the case of a router jointer the length of the router fence. I’ve heard rules of thumb that say you can go as much as two foot longer than your jointer bed. Otherwise as you are jointing the curved (bowed) board “falls off” the end of the jointer and you’re no longer supporting the jointed edge on the flat reference surface. I’ve never really tested this. My jointer bed is 66” long and I’ve never needed to joint anything longer than that yet.

So both of these recommendations boil down to – joint shorter boards.

As for crown up or down I joint concave face against the jointer bed, frown instead of smile.

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