Hi - I am new to the CNC forums and am here because I want to buy a mill / drill and convert it to CNC. I have been reading everything I can find on the subjects and am feeling comfortable with how I am going to proceed.
I wasn't sure what my first post would be about but that has changed because of what happened at work today. A co-worker has offered to sell me a Jet mill / drill. It is a JMP-20VS-1. It is a 1996 model and has limited use. He bought a Bridgeport and wants to sell the Jet. It is a heavy machine with table size and travels at the high end of what the typical mill/drills seem to have. However, there are a couple of things that I need advise on.
It weighs 888 pounds which I thought was good for mass to help with vibration but the column is 4 inches instead of the 4.5 inches that seems to be the norm for mill / drills in this size. Is the smaller column going to allow more flexing?
The motor is 1.5 horsepower. I was planning on buying a new machine with 2 horsepower. Is there a big difference between the two?
Finally, it has a variable speed drive and a top speed of 2000 rpm. I haven't seen a variable speed drive on a mill drill. Should I be concerned? What about the the 2000 rpm top speed, is that enough? Some machines have 2500 rpm.
Thanks for your help, Dave