I've got the 1100 mill, only about two months old now (I'm also a newbie, btw). Using Gwizard with the Tormach 1100 defined, it estimates with a 12mm Carbide endmill, on the most conservative setting, it says I should be able to cut at DOC 10mm / 10% Cutwidth / 5,100RPM / 1,800mm Feedrate on 6061 Aluminum. When I go to test this, I get major squeal and chatter marks.. I've even set it back to 5mm DOC and slowed down the feed to 1,300 and get a loud squeal not the sweet hum when the feeds and speeds are spot on with a very shallow and slow cut. The endmill I'm using is a nice 12mm Iscar coated carbide. I'm cutting dry with a mist of WD-40 on the aluminum block prior to start.

Is there something I'm doing wrong here? Is Gwizard way off or am I using it incorrectly? Appreciate any constructive suggestions from Tormach vets! Thanks in advance!