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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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