On Tuesday 24 May 2016 13:07:48 Todd Zuercher wrote: > For those that didn't get the attachment. > http://s33.postimg.org/8w84v716n/0524160945.jpg > The material is MDF (I did say that in the first message) and has not > discernible grain pattern of it's own. Other cuts (made with other > tools) on that same piece pictured have no pattern.
Watching that, I'd say that the vacuum dust collection isn't good enough to keep the bits flutes cleaned out. It is doing an excellent job of keeping the workspace clean, but there isn't any great amount of air extraction at the bit face itself which could allow it to pack full, breaking the bit. Debris the bit throws out of the cut is handled well, but there is little or no direct vacuum within 1/4" of the tool and cut. > Someone asked what the machine looks like. > http://s33.postimg.org/tgn4bg62n/0524161237.jpg > or here is a video clip of one. > https://www.youtube.com/watch?v=1U6HtvfKUYg > The machine weighs more than 10,000lbs. > > We are cutting nested parts on a flat vacuum table with a spoil board. > Cutting with a much larger bit would give us problems with loosing > vacuum holding power. For larger parts we cut them out with a 1/2" > diameter tool, and the marks are less of a problem then. The small > pieces we have to cut out with the 1/4" tool to keep them on the > table. When milling them with the 1/4" down cut tool the tool path > remains packed tightly with dust, and helps hold the piece on the > table. > > ----- Original Message ----- > From: "Marcus Bowman" <marcus.bow...@visible.eclipse.co.uk> > To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> Sent: Tuesday, May 24, 2016 12:31:29 > PM > Subject: Re: [Emc-users] Tool Marks? > > On 24 May 2016, at 17:22, BRIAN GLACKIN wrote: > > I concur with Nicklaus. This looks like normal wood grain (each year > > ring having a harder and softer section) with the exception of the > > near center of view. In this case it looks like the grain was > > compressed near a branch/knot. This is all mute it that is not a > > piece of wood. > > > > On Tuesday, May 24, 2016, Nicklas Karlsson > > <nicklas.karlsso...@gmail.com> > > > > wrote: > >> I can see the figure but are nor sure I could see the tool marks. > >> Is the wood dry? Are you feeding to fast? > >> > >> On Tue, 24 May 2016 10:14:17 -0400 (EDT) > >> "Todd Zuercher" <zuerc...@embarqmail.com > >> > >> <javascript:;>> wrote: > >>> Anyone know the root cause of tool marks like this? Or better yet > >>> how to > >> > >> prevent them? The lines are not in a straight line or consistent > >> angle, in fact there are places on this piece where they wave up > >> and down. > >> > >>> The tool is a 1/4inch solid carbide down spiral, cutting at 200ipm > >> > >> turning 17,000rpm cutting 1/2" MDF > > So if it's MDF, it can't be grain patterns. > I think its simply vibration. > Can you use a cutter with a much greater diameter (say 1inch or more)? > That would at least reduce the frequency of the vibrations, and the > amplitude. Can you take cuts less deep? That would reduce the stress > on the cutter. > > Marcus > > >> in a single pass. In the picture you can > >> see about a half inch long section of the cut where the cut is nice > >> and smooth, this is where the ramp in point is (start of the cut). > >> The machine is a very large (5ftx10ft) moving table fixed bridge > >> commercial router (Komo) with a 14KW spindle and HSK63F tooling. > >> > >>> It does kind of give the piece a sort of simulated wood grain > >>> look. I've > >> > >> playing with the amount of tool sticking out of the collet can make > >> it better or worse, finding the sweet spot is a bit of trial and > >> error, and 0.050 can make a big difference. You can hear the > >> difference in the sound when you get it right, the cut is very > >> quiet. If it gets bad enough the tool will snap. Also playing with > >> the RPM can somtimes make it better. > >> > >>> It is hard to believe that a carbide tool or collet could flex > >>> that > >> > >> much, but something sure seems to be vibrating. > >> > >>> -- > >>> > >>> ======================================== > >>> > >>> Todd Zuercher > >>> mailto:zuerc...@embarqmail.com <javascript:;> > >>> > >>> ======================================== > >> > >> ------------------------------------------------------------------- > >>----------- Mobile security can be enabling, not merely restricting. > >> Employees who bring their own devices (BYOD) to work are irked by > >> the imposition of MDM restrictions. Mobile Device Manager Plus > >> allows you to control only the apps on BYO-devices by > >> containerizing them, leaving personal data untouched! > >> https://ad.doubleclick.net/ddm/clk/304595813;131938128;j > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net <javascript:;> > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > -------------------------------------------------------------------- > >---------- Mobile security can be enabling, not merely restricting. > > Employees who bring their own devices (BYOD) to work are irked by > > the imposition of MDM restrictions. Mobile Device Manager Plus > > allows you to control only the apps on BYO-devices by containerizing > > them, leaving personal data untouched! > > https://ad.doubleclick.net/ddm/clk/304595813;131938128;j > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ---------------------------------------------------------------------- >-------- Mobile security can be enabling, not merely restricting. > Employees who bring their own devices (BYOD) to work are irked by the > imposition of MDM restrictions. Mobile Device Manager Plus allows you > to control only the apps on BYO-devices by containerizing them, > leaving personal data untouched! > https://ad.doubleclick.net/ddm/clk/304595813;131938128;j > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ---------------------------------------------------------------------- >-------- Mobile security can be enabling, not merely restricting. > Employees who bring their own devices (BYOD) to work are irked by the > imposition of MDM restrictions. Mobile Device Manager Plus allows you > to control only the apps on BYO-devices by containerizing them, > leaving personal data untouched! > https://ad.doubleclick.net/ddm/clk/304595813;131938128;j > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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> ------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
