The speed change on the VFD is far handier than what most lathes, and many mills have. Just turn a knob, just like volume on an old radio.
Tool chattering? Just twist the knob to see if different speeds will stop it. Without a VFD you have to stop the cut, shift the gears, start it up again and see what happens.
Static phase converters are pretty much obsolete with the availability of low cost VFDs and inverters. I honestly can't think of one benefit to using one over a VFD. I tossed the phase converters for my mill and lathe over 5 years ago.
I tossed the single phase motor on my bandsaw and replaced it with a 3 phase motor and VFD. No more changing the belt to go from cutting soft to hard materials. Instead of having just 4 speed choices I have totally variable speed control.
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Today's Featured Article - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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