big table, thin wood

[dbraymer]

I am planning on building a big table cnc with a fourth true axis. The fourth axis would allow the spindle to rotate about the long axis. I would be cutting long and thin curved pieces of wood with bevels on the edges.
So first I need to build or get a big table machine (4 x 14 would be nice). and then I would need to modify the spindle mount so that I could put a changing bevel on a 2 x4 x 8 foot for instance (very simple example).

Any of you smart people out there know where to start on this?

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[awerby]

I'm not following what you're saying about modifying the spindle mount. It seems that a conventional mount for the spindle should work just fine for what you're talking about doing. The main problem you're going to have is vibration on those long and thin pieces of wood as you're cutting them; I imagine it would be quite severe toward the middle of the piece. Cutting one edge at a time with the parts clamped securely to the table would likely be more effective than suspending them by the ends in a 4th axis assembly.

If you decide to go ahead with the 4th axis, one thing you might consider is a gap in the table, so that the center-line of the 4th axis would be at table height. That would allow you to accomodate a piece that's larger in diameter than the height of your spindle. The lower you can keep that, the more rigid your machine will be.

[toddedwards]

If you are doing this from scratch I recommend the same thing I did. www.8020.net and use some strong support. I built mine 4'x8' and left one end open for a 5th axis rotary.

awerby is right though, you will need a LOT of clamping for long materials.


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[hanermo]

I built a machine like that, a double column bridge mill.
Table is 1600 mm wide, and (now) 600 mm deep.

What do You want to know ?

[daniellyall]

hernmo can we see some picks