Cutting aluminum is not a problem with our machines, as long as it is acquainted with a decent aluminum end mill and spindle, and the feedrates and speeds are being follow from the manufacture of the end mill.
Now to have a 3" cutting depth, it is possible even up to our smallest machine (blueChick). I would recommend our blackToe due to the fact that you will have a bit of playing room if any other projects or requests might arise.
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Do you have a cnc kit that can cut 2-3" deep aluminum blocks and costs <$3,000?