JanRwl@... wrote:
> In a message dated 1/18/2003 6:17:44 AM Central Standard Time,
> twb8899@... writes:
>
>
>
>>Several types of spindles were available but I used the 60,000 rpm
>>drill/route spindles on the EX-200 and 80,000 drill only spindles on the
>>other machines. The air requirements for these machines was about 20 cfm at
>>90 psi.
>
>
> Tom:
>
> TWO points: 60,000 and 80,000 RPM? Were these "high frequency" motors, or
> "brush motors"? TEFC, I would assume!
>
> WOW, 20 CFM at 90 PSI! That would keep a 10 hp compressor running possibly
> over 50% duty-cycle! Wouldn't it?
>
> Jan Rowland
>
I haven't seen these motors running my self, but I know they carry a
hefty price tag (secondhand AUD$2500) and suck a lot of juice. I
learned this when I was shopping around for a PCB spindle for my home
made manual drilling machine. They need a variable frequency variable
voltage 3 phase power supply (voltage is proportional to speed because
of back EMF). I think the guy selling them said they run up to 250V at
full RPM. They can use precision ball bearings under 100,000 RPM and
air bearings for higher speeds. I did not buy one of course. Check the
following link.
http://www.westwind-airbearings.com/Adam