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  1. 30-03-2016 #7
    magicniner's Avatar
    Lives in Rotherham, United Kingdom.
    magicniner
    Last Activity: 05-05-2024 Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,021. Received thanks 230 times, giving thanks to others 42 times.
    Quote Originally Posted by Boyan Silyavski View Post
    Nick, how did you do that? It sound a bit sci fi. At how many Hz you run it and hows that that it still works?
    Boyan,
    It's a Siemens 420 (soon to be replaced with a 440) Inverter Drive with an Electro Adda 0.75kW 2 pole motor I'm not sure of the Hz it runs as I've programmed the VFD display to show RPM, I'll check the Hz at 7000rpm later today as I have an aluminium profiling job later today.
    My experience so far is that these things tend to just work if you use decent quality gear, the availability of good, clear, English documentation makes programming the Siemens VFDs a 10 minute job.
    I read a thread somewhere where Sir John Stevenson gave details of converting larger 3 phase motors to milling spindles with integral collet chuck and running them without issues at ridiculous speeds, 7000 rpm does what I need but I suspect I have left a substantial safety margin and that it could easily run faster,
    Regards,
    Nick
    Last edited by magicniner; 30-03-2016 at 03:26 PM.
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