The problem this build tackles is a familiar one for anyone cutting aluminum: getting cycle times down far enough that side jobs actually pay. The maker is running rectangular aluminum blocks on a DMG Mori from 2011, doing the work as a stepping stone toward starting an independent business. With that goal in mind, every minute shaved off the program matters, and the numbers here show real progress.
The setup is worth a look. Workholding is a double clamp vise marked LOCKWELL TLD - 60, and the cutter is a .5 inch, 3 flute HAAS end mill that cost $30. Running at 12k rpm with a 160 Z depth feed, or .61, and a 20% step over, the spindle load only reaches 30% at most. That headroom is striking: the tool barely seems to be working hard while chewing through the tops and edges of the blocks along programmed paths.
The results speak for themselves. Runtime dropped from 20 minutes 3 seconds to 13 minutes flat across the first and second operations, and that one cutter has already earned the maker over $5000. In my view, a $30 tool returning that much is about as good as tooling economics get.
There are compromises and open ends, though. The maker used a long tool holder simply because it was the only one available, and there are plans to push the step over up by 5-10%. The bigger question is whether the program can be optimized to finish in under 10 minutes. Given the spindle load ceiling of 30%, that target seems within reach, but it has not been proven yet.