I took a few more pictures today of the router module in the MFT 800 to be able to directly answer some of the comments made above. Also, there are a couple of pitfalls which I will try to explain.
Here is a photo of the rear edge of the base plate. On the CMS table, there is a mating profile. It is obviously very difficult to replicate this profile when making your own router table.
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You have a choice. Either rest the base plate on the top lip or the bottom lip. I decided to have the base plate resting on the top lip rather than the bottom lip as there was too little material left to provide good support for the bottom lip. With the top lip you can see that there remains a very solid 15mm or so.
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On the front edge of the base plate, these two cams rotate to lock the base plate into the CMS table. Since they protruded slightly, I shaved them slightly and relieved the router table where they made contact.
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Let's address the issue of whether an MFT 800 top is strong enough to support the weight of the base plate, fence and an OF 1400 router.
The base plate is 7mm thick. With the exception of the rear edge, the MFT top is at least 13mm thick where the base plate's sides are resting on it. The top is 15mm thick where it supports the front and back edges, which are twice the length of the sides and carry most of the weight. The rabbet is 1/2" wide on the sides and front edge.
I have total confidence that this is more than sufficient to support the necessary weight.
I have not detected any sag at all in the top, but I will monitor this over time.
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I can also use some Festool screw clamps to secure the base plate to the MFT top behind the fence for extra security. With the fence wings extended over the MFT top, even if there was a failure in the top the wings would not be able to fall through the hole.
I hope this allays people's fears.
The best fence I have ever seen on a router table with horizontal and vertical router stops (similar to featherboards).
Fence up.
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Fence down.
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