High Speed Spindles - ATC

I think you are missing the fine margins I am talking about. I've machine medium carbon steel like 4140HT on spindles in this class at high feeds and speeds. I'm not guessing about that. Just trying to quantify the differences.
 
Bob, from someone who works in the motor drive industry, be aware that there is a US government (and EU) restriction on the manufacture of variable frequency drives which operate beyond 590Hz. This is due to limit the potential export of motor controlling electronics which could be used in nuclear centrifuges. This was spawned by EU Regulation No. 428/2009. You may have difficulty finding a suitable VFD to run these motors at 800Hz as all devices after 2009/2010 should be in compliance.
 
That is good to know, but there are 1000hz VFDs upto 4.5kw available on Ebay from domestic vendors. They look like the Chinese made Sunfar VFDs. I had one rated at 0.8Kw some time back for use with a 60,000 rpm spindle. I didn't look any further than that for right now.
 
Bob La Londe said:
I think you are missing the fine margins I am talking about. I've machine medium carbon steel like 4140HT on spindles in this class at high feeds and speeds. I'm not guessing about that. Just trying to quantify the differences.
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Bob, it looks like your answers will come from manufacturers.
 
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