Re: [CAD_CAM_EDM_DRO] Re: Best source for inexpensive ballscrews?

>
> > I think your 0.02" deptth of cut was very light. I had -rarely- done
> > manual cuts of 1/4 inch on a side when I was making punches and dies.
>
> A 20 thou cut on a 1.5 inch piece feeding 8 inches per minute takes all
> the power the spindle has. We might have been running the spindle a bit
> too fast. That was also using a finishing carbide insert. Spindle
> power or lack thereof becomes very apparent when one CNCs a lathe
> because it is easy to adjust/increase the feedrates to the power limit.
> Even using such cuts the machining time is nothing compared to doing it
> manually and furthermore the operator can be working on other things
> while it runs.

On further thought, a 0.020" cut on a 1.5" shaft at 8 inches per minute
is 0.754 in^3 per minute. On a semi hard steel. Here is an article
that states a 25HP machine removes 13 in^3 per minute. We were probably
pulling 2 HP from our spindle. It is difficult to tell how hard one is
loading the spindle motor. If we did much heavy cutting with this lathe
I'd equip it with an ammeter. We've got one for the mill but haven't
used it yet.



--
Kim Lux <lux@...>