Originally Posted by
tom bryant
I've done work like this and agree w/ viking on the nose radius but would consider finishing with a very positive rake insert with a sharp land and start at the chuck and finish going towards the tail stock, that way it won't push into the chuck and if you have to use a lead hammer resting on the part to reduce vibration until you get the feeds and speeds right. Most of the time I use half the nose radius as my finish doc( unless it's a really small dia.) and rpm is your enemy. High speed works because you can make a sharp edge and slow rpms down. Most folks use carbide because of wear and cycle time. Remember you want to shear the mat'l off, less strees on part and insert.