Re: [CAD_CAM_EDM_DRO] 3 Phase/VFD question

On Wed Jun 2 16:35:28 2004 JanRwl@... wrote:

>In a message dated 6/2/2004 6:07:41 AM Central Standard Time,
>ccq@... writes:
>They are rated at 1725, and 1710 RPMs, respectively. Sounds like the second
>one might be better for the Z axis spindle on a vertical mill, whereas either
>should work for a lathe spindle, yes?
>
>Probably, if you set both of these side-by-side, connected to the same mains,
>they would spin at the SAME RPM. Perhaps---a "blind guess"---with equal and
>significant loads, the latter might run JUST-slower, as the specs indicate,
>but I'm GUESSING they would be the same, and the difference is that one is rated
>by U.S. criteria, while the other (IEC, didn't you say?) is rated by E.C.
>criteria, which is about as logical as rating the reliability of machinery based
>upon the exchage-rate of the Euro at the moment! In other words, I have NO
>clue! I have NO idea why you guess one would be better suited for a mill, and
>the other for a lathe. It would be MY guess that it makes NO difference at
>all, other than pure-chance!

Well, I was thinking about the weight there. 30 Odd pounds vs. 13, is
significant, not only to lead/ball screw wear, but acceloration and directional
change speeds, possible counter weighting that might be needed, and so on.
There's also the sidewalk juggling act performed while assembling all the parts
and pieces, to consider.....:-)

Bill

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