Endcap thread length?

[cdhknives]

I reground my bit, cut a wider relief groove, upped the spindle speed to 418 RPM, girded my loins, and let 'er rip. It looks a LOT better, right off the bit as shown...no filing or sanding to smooth it up, just a couple of spring passes. The internal threads are from a Hertel 1/2-28 tap...not single pointed. I think I am ready to part it off the bar unless someone has a suggestion. I was going to try and lighten it by scalloping the face but I think the benefit is minimal and risk substantial.

[yondering]

You still want to file or stone the burrs off the thread crests, regardless how clean the thread looks. Otherwise the burrs can make the thread feel tighter than it really is. If you're not cutting at CNC speeds, you should assume you've always got burrs at the thread crests, even if they're minor.

[fishman]

If you have a micrometer carriage stop, you can use that more effectively than trying to watch the cutter come up to the shoulder with chips and smoke obscuring your view. That's how I do it; set the stop and disengage half nuts when the carriage is about to touch the stop.

I'd recommend not locking the carriage stop in place if anyone does this. I've cra... I mean, I know a guy who's crashed a lathe doing this.

[quiettime]

I work with 17-4 almost daily and I find it very easy to get a great finish.

However a slightly damaged insert can cause a crappy finish. Make sure you can tell the difference between a fresh insert and one that is worn or chipped.

Also, as was previously posted run the fastest speed you can handle. It really responds well to higher rpm

[quiettime]

Saw your update after my post went to the second page. Good deal with the higher RPM. The lathe I use has 424 rpm and that's where I work most often

Looks like you're doing good