On 4 Jul 2015, at 01:28, Gene Heskett wrote: > 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.
Well I'm using 30 degree (included angle) 1/8" shank carbide cutters with a 0.2mm flat on the tip, and they can flex sideways precisely zero before the little blighters snap. The 10 degree cutters break under a heavy breath, so I have all but given up on those. Marcus > >> 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> > > ------------------------------------------------------------------------------ > Don't Limit Your Business. Reach for the Cloud. > GigeNET's Cloud Solutions provide you with the tools and support that > you need to offload your IT needs and focus on growing your business. > Configured For All Businesses. Start Your Cloud Today. > https://www.gigenetcloud.com/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Don't Limit Your Business. Reach for the Cloud. GigeNET's Cloud Solutions provide you with the tools and support that you need to offload your IT needs and focus on growing your business. Configured For All Businesses. Start Your Cloud Today. https://www.gigenetcloud.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
