Feed rate, RPM, depth of cut, not enough rigidity in your router frame. All those can cause chatter marks like that. Could be flex in the table or the MDF isn't secured well enough. How is it held down? What is the recommended chip load per tooth for the cutter you are using? Its manufacturer should have that data. Google mdf feed speed calculator If you're breaking cutters you are pushing something too hard/fast. 1/2" thick MDF in a single pass with a 1/4" cutter is a tough job. You might find you can make the cuts faster in two higher speed passes than in one full depth pass at a lower feed rate.
From: Todd Zuercher <zuerc...@embarqmail.com> To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> Sent: Tuesday, May 24, 2016 8:14 AM Subject: [Emc-users] Tool Marks? 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. ------------------------------------------------------------------------------ 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