@wmoy honestly if I could run 4.5krpm on that 0.250 I would for sure. 600sfm isn’t too crazy with an altin coated tool and decent chipload. A 1/4 shank necked stub 0.125 would be fun, maybe get into the higher chiploads.
@Julien many people have cut steel on an s3 stock. Its pretty simple to adjust load to where it will do it. Just like how you can cut tool steel on a 70 watt nomad.
http://www.lakeshorecarbide.com/18stubvariablefluteendmillforsteel.aspx
http://www.lakeshorecarbide.com/18variable5fluteendmillforstainlesssteelstublength.aspx
A couple maybes for a big 304 project coming up
I’d like to pick Swim for $1000…
Pretty sure carbide sinks in water so I’ll take that bet. 
These are rated for 700sfm and a Makita at 10k is 654. Little close for comfort but it could work well.
