That Incra LS is an impressive tool, but with 72" rails, too wide for my little Delta hybrid saw that has to fit in a 64" wide space along the wall of my shop/garage while not in use. The right side has a shop-made router table/extension.
Does anyone know of another good alternative to my Delta knock-off Beesemeier-style T-fence, that could deliver accuracy approaching the Incra system?
As Terry Q correctly points out below, the Incra relies on a "positioning" system using a rack and pinion if I recall from having my friend demonstrate his to me. It is very "accurate" in that it will locate in precise increments when you "position" it. It will also be parallel to the miter slots, which is critical.
Your Delta clone will not "position" itself incrementally, you must set it each time either by measuring from the blade to the fence OR by using a spacer block between them. It will also lock down parallel to the miter slots, IF it's at all like my Biesemeyer fence(s). The Wixey digital tape system comes as close as anything out there to position the fence without actually using a separate measurement each time you adjust the fence.
So, what's "accuracy" really mean in this context? It means repeatabilty as far as I can tell.
Then here's the issue: Where is the accuracy desired, in the distance from the blade to the fence for getting the same thickness rip OR a repeatable offcut? You can't have both, because in one case the fence is stationary, in the other case, it's being moved and reset each time. If you don't move the fence each rip will be exactly the same ...... in my experience. If you move the fence for each rip, you must rely on a "bump" type jig to reposition it for each successive rip. That will typically get you very close, but there is some room for error IF the fence doesn't lock precisely each time. My Biesemeyer fences do, so not a problem for me.
I don't think you can "get there from here" and have the best of both worlds without sacrificing something .... either rail length and capacity OR hand positioning and measuring each time and or using a "bumping" system. You have to pick one or the other.
The Incra LS Positioning fence is unlike any other fence on the market.
Once you understand how to use an Incra fence you’ll change the way you use table saw fences. For instance, if you needed some thin strips, say 1/8 inch or less.
There are a bunch of jigs and devices to help push a board past the blade with your typical fence, but with an LS Positioning fence it’s a completely different procedure. You grab a nice wide board, set your fence to the nearest 1/32 inch width of your board and rip your board parallel. Then subtract the kerf of your blade (full kerf 1/8” blades makes for easier calculations) and the desired thickness of strip, as thin as 1/32, and move the fence. Shove the nice wide board past the blade and your strip comes off the outside. You keep moving the fence. Impossible with standard fence, but with Incra fence it is accurate and easy to do.
Before giving up on the idea you should write to Incra technical support asking for advice for fitting a fence to your saw. It’s probably something they deal with on a regular basis.
Thanks for pointing this out, it led me to my conclusion above.