Originally Posted by
peteeng
Hi Layton,- what vibrated? Just the screw or the machine? In regard to chip load I have found this table useful. It recommends a chip load of 0.5mm/tooth for the 1/2" tool in timber. At 20,000rpm this means the feed should be 787in/min. At 150in/min the tool is rubbing most of the time. This is why you need more feed speed. The 1/8" tool is spot on 157in/min at 20k... Or use a smaller tool for roughing or use a 1F tool at 10k and 200in/min to get the CL right. Your tools will cut better and last longer with the correct CL.
If you used the 1/2" tool at 10k then you need 400in/min or 10m/min which is the 10mm pitch screw at 1000rpm. I'd be inclined to go to 1616 to give you some headroom in the feed. I'm going there for my next machine....
cheers Peter