MFT sacrificial backing board

[sgryd]

I have experimented some with exchangable backing boards for MFT cuts.

It's important to back your work piece well to get splinter free cuts. Hence you'd ideally have one kerf which is exactly one blade width in width, cut into the MFT. This is doable if you position your guide rail on the exact same spot every time and only do 90 degree cuts. But if you move the rail or do beveled cuts, you'll ruin your nice kerf.

Solution: Exchangeable backing board.
I routed a 6mm deep 30mm wide dado into my home made MFT. This gives 13mm left of the 19mm table top to hold it together. I suppose this would be enough, but I have backed the top with a an extra 19mm of MDF glued. And also a 45x90 extrusion. I think this will hold =)

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modified: Smaller image sizes and correction of bad math

//michael

 

[Corwin]

...
I routed a 6mm deep 30mm wide dado into my home made MFT. This gives 16mm left of the 19mm table top to hold it together. ...

Some kind of new math?  [blink]

 

[sgryd]

Well, I don't have any excuse for that, other than my extra 19 + 45 mm which makes 3mm a minor error

 

[sancho57]

good idea about the sacrificial top. I could easily use some  (2 ea) 1/2" MDF to limit weight, use forstner bits to counter sink bolt heads attach it to the top of my 2  MFTs. the cut the heck out of what ever im making and save the MFT top for cross cutting etc. Ive book marked this to my festool Idea folder.

Thanks for sharing.