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Originally Posted by DonRotolo
Seconded (thirded?). I built their 50 x 27 machine and am very pleased with it. With FRC discounts on 80/20 and building many of the aluminum bits myself it came to just over $3200. (I would be happy to advise you on what to buy and what to make, depending on your fabrication abilities and capabilities. Also, don't waste much $ on the "upgrades", I can help you design your own).
Definitely go with the 50" X-carriage. Your table can be relatively small, and you can index and move the stock to get a larger piece through.
I recommend you proceed carefully for a 4 x 8 machine, it's hard to manage clamping stock and such; you'll find you use the front 2 feet 98% of the time. Also don't limit yourself to the suggested lengths; the Y axis can be absolutely any length you wish.
4 x 4 (50" x 50") seems like a good size.
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What kinds of materials have you been cutting with it? Our team is looking into giving our current mill CNC capabilities, but depending on the cost and space building another one might also be beneficial.