I have both as backup units.
The V3000 is older and came with a cartridge controller until the very last units. It will work with an EP module which is far less prone to burnout. It has about 1/4 inch of spindle travel, really limited. Some units had the sensor sleeve cut too large and would not even touch the table with the spindle nose. I had sleeves made that would just touch the table and allow a 1/4" thick acrylic keychain fit under the nose.
The V3400 came with the EP module. I think it has a slightly greater spindle travel. It runs at about 3/4 the speed of the V3000 at max. Compared to today's machines it is very slow.

Philadelphia, PA (Really Bensalem)
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