Not Ranked
I own a Jet JMD-15 machine and love it. Both the JMD-15 and JMD-18 work about the same with the JMD-18 being a little more heavy duty with a slightly larger table. The JMD-18 is 230V only, however, while the JMD-15 can be set up for either 110 or 230V use. Both machines adjust the Z axis manually by loosening 2 bolts at the rear of the housing and raising or lowering the head via a crank, the only feature of the machine I don't like. I would prefer a Bridgeport style Z axis adjust with the front mounted crank to raise the table. However, I picked up my JMD-15 used for $400 so I wasn't going to complain much.
If you opt for a large floor mounted Bridgeport, many of them require three phase electric which would require some fancy wiring tricks. They are extremely heavy and space taking machines but sure do work well especially when equipped with digital scales.
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