After burning out a router and fitting a spindle alone with a VFD and having to do a complete rewire with cy cable I am now happy with the result.
Now I am trying to get my head round speed and feed.
But I must be going wrong some where. I'm Cutting 6mm birch ply with a 4mm single flute end mill at a depth of 4mm per pass, but the bit is still very hot to the touch when done, The chip load for ply cut with a 4mm end mill. I have found is around 0.20 to 0.24 the equation that I use is ( Number of flutes x chip load x spindle speed ) = feed rate.
So this comes out as 1 x 0.24 x 15000 = 3600 mm/min I have been adjusting this and I am now at a feed rate of 6500mm/min and the bit is still hot. It looks like I will have to drop the spindle speed down but at what speed will the spindle not have enough power to keep cutting ( my spindle is only a 0.8kw water cooled ) or will I keep going with increasing the feed rate?
Also where am I going wrong with the equation or is it the chip load I got of the Internet wrong?