Can you make the top skin of your torsion box only the size of what you can mill? You could still attach other boards on the edges if you like.
If you’re doing the bulk of this milling on webbing, then don’t pocket the whole table, just the areas with webbing. (I’m going to assume 48″ wide table for a moment). You could make a cad/cam to mill 48″ wide and 1″ long. Then just move to one piece of webbing and start that job. Then move to the next piece, etc. Then do the same for the perpendicular webs.
In a way, yes. When designing the table I forgot to account for the 205mm lost at the back of the table - my rails should have extended a little over 8" in Y axis beyond what I wanted to machine. Which brings up the sore point of dimensional lumber - I forgot it applies to MDF... I should have built my table to actually handle the full sheet. Horseshoes and hand grenades though.
Since my fusion mockup is exactly the same dimensions as what my table turned out to be in real life, I simply did a push/pull command on the components of the torsion box to make them 12.7mm in height. I then used the face toolpath, selecting the model bottom geometry, set the bottom clearance to -0.1mm from model bottom, even stepdown at 1mm per pass, and used the feeds/speeds listed above. This generated a tool path requiring only 6 minutes (roughly) for each “slice.” Total machining time is reported as about an hour and 14 minutes - a far cry from the 12 hours before (it was not doing any rapids at all and running at 8mm/s for all moves).
Thanks for the input Jeff, it is appreciated.