Using a track saw to resaw boards.

[ChuckM]

I do recall one book saying that a good way to cut multiple strips of wood was to mount two blades in a table saw with a spacer between them.  So it suggested that with one pass I could turn out 2 strips 1/4" wide. 

Snip.
The only injury I have ever had in woodworking was a "kick-up" of a short piece of narrow stock.  I had never even heard of a "kick-up" before that.

I have never seen, heard or read about any serious woodworker using two blades in a table saw at the same time to rip lumber, unless the "two blades" we're talking about are mounted with "wobble washers", which are actually a dado set.

Apart from real safety concerns (including holding the blades securely to the shaft), the rip quality would be poor due to vibration. If you can find out the title of the book, please share it.

The "kick-up" you experienced was actually part of a "kickback." The stock was "lifted up" by the back teeth of the spinning blade as it was fed into the blade.

 

[ChuckM]

Unless it's beyond the cutting depth capacity of my table saw (SawStop PCS), I always use my table saw to resaw (much faster compared to my mediocre bandsaw), similar to this, but with one difference:
http://www.youtube.com/watch?t=128&v=spotCL6y_7c&feature=youtu.be

Critical difference: I install a tall fence before resawing if I am resawing with the full blade depth, or close to its full depth.

A rip blade, riving knife, push shoe and featherboards are indispensable when resawing.

The drawback of resawing on a table saw (even with a thin kerf blade) is a bit of wood waste.

 

[bcrawley]

ChuckS I've read about using two blades for tenoning applications before. Two blades spaced as with a dado stack, and the depth of cut is likely only an inch. So people do it; I haven't and I'm not sure I would. I searched and found this pdf pretty quickly.

Twin-blade joinery

Even that is a long way from a deep rip.

 

[ChuckM]

ChuckS I've read about using two blades for tenoning applications before. Two blades spaced as with a dado stack, and the depth of cut is likely only an inch. So people do it; I haven't and I'm not sure I would. I searched and found this pdf pretty quickly.

Twin-blade joinery

Even that is a long way from a deep rip.

Tenoning and ripping are two different sawing procedures as the former does not result in any piece coming apart and off, just like dadoeing. The middle part was still intact as the article photo shows. No loose piece to get trapped between blades (as it would be in the case of ripping).

That's why it's safe cutting a dado using a saw fence as a stop block. but not when cross-cutting a piece off. I'd like to see an example (text in a book or magazine or video) in which it is shown a stock is ripped in three pieces at a time using two saw blades on a table saw. Then I can easily point out where the danger is, and why people don't do it.

 

[Svar]

I'd like to see an example (text in a book or magazine or video) in which it is shown a stock is ripped in three pieces at a time using two saw blades on a table saw. Then I can easily point out where the danger is, and why people don't do it.

Gang rip saws with multiple blades do just that. Of course they are not fed by hand.

 

[ChuckM]

I'd like to see an example (text in a book or magazine or video) in which it is shown a stock is ripped in three pieces at a time using two saw blades on a table saw. Then I can easily point out where the danger is, and why people don't do it.

Gang rip saws with multiple blades do just that. Of course they are not fed by hand.

Gang rip saws rely on hand feeding initially, and then the rolling feeder takes over. But they aren't table saws as we know them.