On Friday 03 July 2015 20:19:09 Bertho Stultiens wrote:
> On 07/04/2015 01:48 AM, Gene Heskett wrote:
> >> If we assume a mill with zero backlash and spindle-speed very much
> >> larger than the feed-rate, would you still care or be careful about
> >> direction?
> >
> > Call me a picky old fart,
>
> I would not dare call you picky. 

Oh?  why not?

> The other part I have no comment. ;-) 

I've been called lots worse than that.  And I call myself picky because 
its the best fix for good enough, which too often isn't.

> > but yes, direction will show because there is going to be the
> > machine and tool flex from the cutting force, miniscule for a 10k
> > rpm conical bit. Double that force every time the tool revs get cut
> > in half and it will become quite visible.
>
> Good point. I had not thought about flexing. That will definitely have
> a result.

Yes, the common 1/8", 60 degree solid carbide engraver can probably flex 
sideways 30 thou when pushed too fast, before it breaks.

> Flexing could also be a visible problem if you retrace a path. But it
> would depend very much on feed-rate and speed.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Genes Web page <http://geneslinuxbox.net:6309/gene>

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