You can joint the longest board you can support. After that you need support before and after...

 

Might need a helper or two to do it, but I totally agree with that.

 

The bed is short and it would be best to limit length to about twice the length of the bed. However you can joint as long as you want if you support the board. Supporting a long board will be difficult because you have to have the support at the exact same level as the bed of the jointer. You could add some boxes the correct height of each side to make management of the feed of the board easier but the support if too short or too tall will make your edge joint U shaped.

 

D) All of the above

the standard rule is 2x the table length, but you can make the table longer. I was able to joint some 6' long stock on an old, 4" King Seeley jointer when that was all I had. If the tables on that were 18" long I would be surprised.

 

That's interesting, Doug. How did you go about making the table longer?

 

You just need a roller on each side of the jointer. One to support it as you start and the one on the end to catch the weight after it make the pass over the cutters....

 

I'll let you know how it works

 

Set the support up using the longest straight edge you can find. The infeed and outfeed tables are at slightly different heights, so the straight edge needs to be flat on either in or out table. A good 3-4 foot level will help, use a weight to hold the end down on the table(s). Making fine adjustments on support rollers is difficult to do precisely, more so if the stands fold. If you replace or change the height of the blades, the outfeed height changes as well, so another adjustment to the outfeed support height will be necessary.