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Another thing that will help is the type set screws you use. Some have knurls on the point that act like a lock washer and will run in cut the will have to cut their way out (just slightly). I would use those against the shaft and flat nose for the back up that would be bottoming out on the first set screw in the thread. I used this method along with medium or some call it screw grade Loctite. If you do use any form of liquid lock though be sure everything is good and clean like RC said.Hi LC, I see from you first thread you are using an end mill (4 cutting edges) for cutting. If you are plunging into the material with this tool you might have a problem as the centre of this cutter usually has a non cutting area or even a hole in the middle of it so if your plunging in at 9" per minute you will be pushing the cutter further into the holder. Try a slot drill (2 cutting edges and slow the Z feed rate down. I used to tell my students to use at least half the X Y feed rate when plunging in with a z axis cut for that very reason. Plus the fact that I was standing with them when they took the first cut with safety goggles, a hard hat and bicycle clips on (you work out the need for cycle clips). It also gives you time to hit the emergency stop if there's a serious problem with the clamping etc.
Keep trying if your like me you will quickly find CNC is great fun and a sense of achievement when all is working fine.
Jim
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