Incra LS router-table fence gets installed

I had no real shop-time this weekend even with a -3 degree temperature outside. Goal for this week will be to finish-sand the various leg assemblies and began the fit up.

But first, I wanted to get the new Incra router-table fence installed…

A lot to like…

On Tuesday night, I completed the installation of the Incra LS 25 “Super System” onto the router table. Complete installation took less than an hour.  I am very impressed with its fit, finish and packaging.  The fence seems exceptionally well thought-out and engineered and if it operates nearly as well as it installed it will be a pleasure to use.  The instructions were clear and easy to follow and all the parts were well labeled and packaged.  The accuracy of the machining on the parts was excellent, and it was made in the USA.

It’s hard to describe how the Incra fence differs from a traditional router table fence.   The primary difference is what is called “incremental positioning.”  Simplistically, this allows the fence to be moved forward or backward in very tiny, very accurate increments (a couple of thousandths of an inch at a time).  The fence operates like a large engineer’s T-square that is mounted on a sliding base on the surface of your router table.  The router-fence itself being the  T-square’s crossbar with the long measuring unit sticking out perpendicular to the fence toward the rear-edge of the router table.  I recommend reading the website for clearer details (

I purchased the larger (longer) of the two units, which has a 25 inch reach (vs 17 inches for the smaller unit).  The fence width is the same for both size Incra units, with the only real difference being the length of the positioning bar.  I also purchased what is called the “Super System” model.  This model includes a split front-fence attachment, dust collection, and a high-rise attachment in addition to the basic incremental positioning unit.  These pieces can all be purchased separately if desired.

After having permanently mounted the aluminum base unit onto the rear of my router table during initial installation, the fence itself is now very easy to remove and replace as needed.  This is a nice feature to allow for easy conversion to pattern routing, etc.

Calibration and squaring of the unit was easily accomplished following the instructions in the manual and it appears to me that these settings should hold with good reliability and only occasional checks.

After I have had a chance to really use the new unit,  I will post a more extensive review.

The only real negative so far….(other than price)

The fence requires a great deal of distance behind the router-bit collet to the back edge of your router-table. I knew this going-in, and that’s why I had added a plywood router-table extension  earlier last week.   Even so, the fence barely fit on the new table extension and still overhangs the back edge by almost 4 inches. According to the instructions, that’s not a problem….but if you intend to install an Incra fence onto your existing router-table, keep in mind that its likely to need to be MUCH larger top than your existing table-top (something like 34 inches is required behind the router bit to accommodate the larger Incra positioning system!).

If shop space is at a real premium in your shop, this could be a major negative for it an Incra- style positioning system. Also, keep in mind that when the fence is retracted backwards into the Incra’s base to make joints on wide workpieces, the aluminum positioning-unit will extend a significant distance behind the back edge of your router table. So, if you already had 32 inches behind the center of your router bit, you may have as much as another 20+ inches of aluminum positioning bar that extends behind the table (on the larger Incra unit).  This precludes you from positioning your router table with its back against a wall.  That’s not a problem for me given the position of the router-table in my shop, but it could be a real issue for people working in tighter conditions. Of course, if I had purchased a smaller unit it  would have required slightly less room.

About mattsanf

Matt Sanfilippo is the Chief Partnership Officer (CPO) for the College of Engineering at Carnegie Mellon University (CMU) and Co-Director of its Engineering Research Accelerator. In this role, Matt coordinates and enables strategic and sponsored research opportunities across the college, and stewards the development of proposals for major research opportunities along strategic themes. Additionally, he enables collaboration among the college's research institute/center executive directors, and industrial and government relations personnel in the pursuit of opportunities with industry, federal and state governments. Before becoming CPO for the College, Matt was the Senior Executive Director for Research Initiatives, the Executive Director of CMU's SII (Smart Infrastructure Institute) and ICES (Institute for Complex Engineered Systems), and Associate Director of PITA (Pennsylvania Infrastructure Technology Alliance) and RAMP (Research for Advanced Manufacturing in Pennsylvania). Before CMU, Matt was Managing Director of Applied Technology for Michael Baker Corporation, an engineering and energy services firm. Matt managed Baker's technology division including Geographic Information System (GIS), software and web development, multimedia, virtual reality, visualization, Global Positioning System (GPS), mapping and surveying services. Before joining Baker, Matt was an Innovation Director for Redleaf Group, a Venture Capital/Operating Company focused on information security, supply chain and mobility solutions. While at Redleaf, Matt managed technical due diligence for seed-stage investments and coordinated relationships between Redleaf and their partner companies. Prior to Redleaf, Matt was CIO of GZA GeoEnvironmental Technologies, an infrastructure engineering firm, and operations manager for their Internet start-up that focused on web-technologies for health and safety and manufacturing metrics. Matt is on the board of Larson Design Group (LDG), past Chairman of the Board for the Pittsburgh Botanic Garden, current board member of the Pittsburgh History and Landmarks Foundation (PHLF), current Vice President of the Sewickley Heights Gun Club (SHGC) and former member of the Information Sciences and Technology Advisory Board for the Pennsylvania State University Beaver. Matt is also former Vice President of the Pittsburgh Chapter of the Association of Internet Professionals and former Vice President of the Board of Trustees for Baker Combined Charity of Pennsylvania.

Posted on February 7, 2007, in Tools and Shop. Bookmark the permalink. 4 Comments.

  1. Thanks for the detailed description. After the dumpster pulls out of my driveway (hopefully in April or May) I’m planning to build a router table to use some of that new-found space. Your description tells me enough to know I would like the fence, but not have room to deploy it.

  2. Nice write up on the LS-25. I have the same with the Wondra Fence and also found the setup very easy. First project was a double dovetail box. Near perfect by following the simple instructions. A key point on the double dovetail is to make sure the cut off section of the 1st set of tails is 3/32″ for a 1/2″ x 14 deg bit. This corresponds with the fit into the pin section. If the decorative tails are less than 3/32″, you will have a hairline gap. Also, the sequence of cutting the rabit before cutting the decorative tails is important to avoid tearout. Watch for these 2 things and you too will have a perfect 1st double dovetail box. Also, the jointing capability with the Wondra fence is great to adjust the fit of some tight items.
    Lastly, watch for price drops on Amazon, you can get the LS-25 Super for low $300s
    Route On !

  3. I have the Incra Ultra fence but the rest of my router table was small and in sad shape. I decided to upgrade before my next project and boy am I glad I did. Woodpecker makes a 27″x43″ table top specifically for the Incra Ultra and also accomodates their V2 Precision Router Lift. Wow, what a great upgrade. The table is thick, spacious, and makes wood manipulation a breeze with its laminated surfaces. The PRL makes adjustment a snap and I no longer have to remove the router from the table to make bit changes. It is built like a tank and matches the precision of the Incra Ultra. I dropped in a new Milwaukee 5625-20 fixed router and I could not be happier. If you are looking to upgrade your router table, I strongly recommend these products.

  4. Based on the poem, why do good fences make good neighbors?

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