Re: [CAD_CAM_EDM_DRO] Motor size calculation HELP

> >The above calculation would say I need a 116 in-oz motor (40% reserve).
> >Not sure how much reserve is needed. Did I miss something?
> >
> >

I am using steppers.

> >
> 60 IPM is QUITE a lot. I suspect you might have been able to do more,
> but you
> need to turn the cutter faster. As the feed rate increases, the cutting
> tooth has
> to take a thicker chip off the work, and at some point the advancing
> workpiece
> rams into the BACK of the cutting tooth. When this occurs, you can see
> smashed
> metal on the back of the cuting flute. Assuming a 2-flute end mill at
> 2300 RPM,
> that is 4600 cutting teeth per minute. At 60 IPM, each tooth is taking
> a cut of
> 60/4600 = 0.013", which is enormous for a 1/4" end mill. If you look, I
> suspect
> you'll find that smeared metal on the back of the tooth. There is a way
> to grind
> the flutes to allow feedrates like this on aluminum, but standard end

mills

> won't handle it.

Yes, the back of the tooth is smeared with metal. I was not under the
impression that IPM really meant rapid speed. That’s why I didn’t understand
how people where getting such high cut rates. Don't know much about it, back
to the books.


Thanks