CNC Router for cutting out ribs

[Jflyer]

Great info Dan.
I wonder if the 1/4" bits will hold up better with the larger bit providing more cooling via heat transfer/disbursing through the shank at a better rate. I'm not an experience CNC router expert by any means, but when I was getting started a couple of years ago with the Techno Table top, I had a lot of 1/8" bits breaking that showed bluing from heat build up. I tried a number of different feeds and speeds and finally changed the collet and went with 1/4" bits at the advice of a CNC forum. I haven't had any issues since then. I was cutting MDF, HDPE, and some ply, but the principal may carry through to aluminum.

[X'N]

You may be correct there. I choose 1/8 bits for a couple of reasons. 1 I could nest them tighter to maximize material useage 2. slower feed rate being my cnc is more precise when cutting slower I also bought an amana 1/4 bit to play with... The good news is that I was getting the heat out of the material and into the chip with the faster feed rate. I have most of my wing parts cut so I don't see myself cutting too much more aluminum with the router.