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    Deep Internal Groove - Can anyone recommend a tool?

    Check out ThinBit from Kaiser... https://www.thinbit.com/products/design-a-groove/index.php
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    Live tooling suggestions!

    Heimatech part number 8 011 44 018. Just like this drawing but with a 3/4" arbor (for an NTY3-100 or WT-100... Nakamura's smallest turret size on their twin spindles). This is holding a Sandvik RA390-038R19-11H...
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    Live tooling suggestions!

    I use Heimatech on my Nakamuras (NTY3-100 and 150). Also have Alberti on a WT300. Both are good, but I prefer the Heimatech. Are you having chatter/finish issues? Have you tried axial? This is how I put flats on (Nakamura Super NTY3...now known as NTY3-100). Used it on Super Duplex 2507.
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    Rotary Broach - 3/4" Hex?

    That part I was speaking of used to be made in several operations, one of them rotary broaching on an old Brown and Sharp (cam drive could handle the thrust). 1st op - Acme screw machine 2nd - Brown and Sharpe 3rd - wash 4th - send out to vendor for thermal deburr 5th - CNC lathe to finish 6th...
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    Rotary Broach - 3/4" Hex?

    This is from Slater's broaching catalog for internal broaching. https://www.slatertools.com/resources/uploads/PDFs/ST-catalog-english.pdf
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    Rotary Broach - 3/4" Hex?

    I needed to broach a 5/8" internal hex in 316SS. The thrust required (according to Somma or Slater) was beyond the Z-axis capability of my Nakamura WT-300 (that's a fairly big lathe). I single pointed with a PH Horn broaching tool instead. Drilled to size, then used a small endmill to reduce...
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    Spade drill

    Use carbide. That's a vague answer to your vague statement (wasn't even a question). If you want better help, add more context. TSC or flood, hole size/tolerance, cheapo drill or higher quality, etc...
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    Need a new drill manufacturer/supplier?

    Screw machine drills are generally about 4XD, and jobber drills about 6XD. Cleveland Twist still follows some of this older drill terminology/methodology. Also CJT drills, now owned by GWS Tool Group, has a lot of high performing drills that follow this, too.
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    Turn groove surface finish

    I'll also add that sfm above 750 will help finish in 1018. In the absence of getting speed because of diameter limitation, use an insert grade/chipbreaker made for aluminum (i.e. sharper edge). You'll suffer some on tool life, but it should help your finish.
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    Single point cutter for 1 15/16 14TPI thread cutting

    Sandvik, Seco, Kennametal, Iscar, Mitsubishi, Vardex, Carmex...just to name a few
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    Super Duplex

    I'm confused by his posts, too, brew guy. The speeds do not compute. Infoseeker - knowing you have a CVD coated insert doesn't mean much...grade and chipbreaker is what's important. Just make sure you're using something for SS. You're using a Sandvik silent bar, so I', assuming you may be...
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    What is the most efficient way to mill out this hole?

    From your endmill pic, looks to me like you're using a flute length much longer than needed. If you do get a new carbide endmill, go for 20mm length, or 25 at most. Try to maximize rigidity...including what you're using to hold the tool.
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    Do Okuma machines not use O numbers?

    Okuma requires a letter at the beginning of program name...any letter. I don't know about older controls, but the 5000L-G controller (circa 1982) and newer could take 16 characters (including dashes)...just has to start with a letter. I use this before any cut code to draw the workpiece on the...
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    Brass Mouthpiece Backbore - Reamer vs....?

    Bore that thing from both ends and find a point somewhere in the middle you'd like to meet. PHHorn has some great tools for small stuff. Plenty of options in their 105 line to do this. Go to hornusa.com Horn's 110 line of boring bars could do the trombone mouthpiece from one end...see below...
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    718 surface finish problems

    You're asking for a speed recommendation without giving us the diameter your turning. The carbide should be able to handle about 150 sfm in Inco 718, but that means squat when your turning with a wall thickness of .025". A positive insert with smaller nose radius will help reduce tool...
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    304L VAR machining

    I'm not familiar with Walter's grades and geometries. Are you using one designed for stainless (ISO M)? If so, then 400sfm should be a suitable speed for 304 or 316 SS. With Sandvik's 880 drill and SS grade/geometry insert, I'm running 550 sfm in 316L. Feed rate is similar to yours for a 16mm...
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    304L VAR machining

    I think your speed is on the low side for indexable insert drill. That's probably not what you want to hear. You should be starting in the 350-400 sfm range since you don't have high pressure coolant.
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    Machining Inconel 625 with ceramics and carbide

    It appears you are unsure of the finish requirement. Is it a 2, or 4, or something else? Rough ream then finish ream may be able to do it depending on the actual requirement. May want to look at roller burnishing (Cogsdill has some good stuff).
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    Degree vs. Knowledge

    I don't think college is mostly a scam. The problem is more about bad advice from career counselors and colleges promoting an "experience". Go for a degree that has a good job outlook....look at future opportunity. Get your gen ed classes done at a community college, then commute to a nearby...
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    Okuma LB25 program

    Don't forget gear selection... M41 and M42. If M41 is active and you program S1000 without an M42, you won't be getting up to 1000 rpm. I'd agree with losing M66. Your machine may not even have that option (cycle time reduction feature).