However, when I mill a one-off I can do it many times faster with carpet tape. Both methods will pay off if you're milling a batch since changing stock is very fast. I've never done this myself but I heard that drilling/milling into the vacuum holes ( or grooves ) is not a good idea - weaker vacuum, abrasive swarf going into the pump, etc., so you spend time designing your table for the board you're making. Everything can be machined except the horizontal hole which you would drill, tap and screw in the vacuum port. Another way is to clamp a 1" thick piece of HDPE and make the vacuum table out of it. The fastest way to make sure is to mill the top surface flat however, since vacuum table is expensive and your machine may not necessarily be good enough to mill aluminum you spend time with indicator in the spindle measuring and shimming. You mount a vacuum table (or any other jig for this matter) on the machine and start wondering if its surface is orthogonal to the spindle.
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