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This can Be very "Flattening"

2/25/2016

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One operation that seams relatively simple but is difficult to achieve is to perfectly flatten a large slab or surface. If you should have a Planner or a sander that is wide enough to get the piece through, the piece will come out with the two sides parallel but not necessarily flat. ( If the piece has a twist in it, it will come out twisted.)
The video below shows how I can flatten a large surface using my CNC Router, Depending on the degree of variation in the surface this process may take a few passes to get it perfectly flat. 
This particular piece was a older table top that the owner wanted to re-finish, so as well as flattening it I was able to remove the old finish.
To explain what's happening here, First you need to start with a piece that is stable , ( meaning dry and acclimated to interior conditions.) 
I stabilize the piece on the machine table so it cannot move , then I take a series of traverses using a large diameter flat bottom router bit ( called a " Table Mill ") once I have the first side flat I can then flip the piece over and to the same process on the opposite side.
Now this can be sanded and finished and you have a perfectly flat top.  There may still be some deflection in the piece over time with changes in humidity and temperature.
Another very important item is that the top needs to be completely finished top, bottom, and all edges so that you can prevent moisture from penetrating into one surface more than another. This is referred to as a balanced finish.

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    I've pretty much had my hands on wood for the most part of my Life. Started in High school, on Marthas Vineyard Mass.Worked under a Father and son Partnership that taught me the valuable foundation of what High End work really is.
    I've taken those fundimentals and put my own spin on things. Today (some 36 years ago as I write this )My shop is located in Northern New Hampshire, where I have followed my philosophy of doing high quality work and delivering more than the
    customer expects.

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