Todays Project - What did you do today?

[f350ca]

Saw this in a machining video, can't remember who's to give credit. He was using it with a pin to rotate a part on while rounding the end with an end mill. He could bolt stops to keep the cutter from digging into the side, worked slick and think it will have lots of other uses. 
At the moment were's all tapped out though. Made from a piece of scrap from a plant that makes helicopter parts, don't know the alloy but sure nice to work with.