Lets see, 200ipm turning 17,000rpm comers to 8.5 revolutions per inch. Think about it this way, if you rolled the 1/4 router but over the wood you would have 1.33 revolutions per inch. it would not cut at all because there is no relative motion between cutter and wood. But you are getting to close to this and the spiral pattern of the cutter is showing up in the wood. Vibrations at a frequency that is small multiple of the repeats of the spiral pattern of the cutter
Try the same cut at a MUCH slower speed. On Tue, May 24, 2016 at 7:14 AM, Todd Zuercher <zuerc...@embarqmail.com> 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 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 > > ======================================== > > ------------------------------------------------------------------------------ > 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 > -- Chris Albertson Redondo Beach, California ------------------------------------------------------------------------------ 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
