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The HRC has an rpm of 138.
That I do not understand...
Hardness Rockwell C?
But the 10MM to 7 MM and thread it... for an inch... not unusual.
You are making this a lot harder than it needs to be. I have machined, tapped, single point threaded hundreds of parts up to 19" long. By using a 5c fixture on top of a face plate/angle block and such, you can do your turning etc. right on the ends, with only what you need sticking out.
In this picture you can see the 5c fixture on top of a 12 inch angle block I use all the time. Ignore the aluminum parts on the fixture as they are for a different part.
Just get a cheap and simple 5c fixture and blocks or angle block.
Mike
The file attachment manager is not working right now, so I can't post the picture. So, just picture it in your head, simple 5c vertical fixture on top on an angle block.
M
Working at home. This is an old picture I had loaded for another post, so no aluminum to disregard-------Mike
To the original question, the Haas spindle doesn't have a physical brake on it, so it won't be able to hold a turning tool steady. Putting the lathe workpiece into the spindle is a better option...still jumping through a lot of hoops, but at least it'll technically work.
If you want to do turning on a mill it's far better to put the part in the spindle and the tools on the table. In my case that gives me a 15000RPM lathe with a 41 part automatic part changer and as many tools as I care to fit on the table. I could theoretically do B axis turning on it too.
The orient on any of the direct drive spindles isn't very firm. I'm sure it's positioned accurately, but the holding torque is awful. I can rotate the tool probably 5deg out of position by hand before I feel it fighting back significantly. On broaching operations all the force is axial thrust along the spindle axis, not a torque load. You might have a little more holding torque on a gearbox machine, but it's still not a mill-turn with a Capto spindle designed for this (like a mazak integrex has, for example)
Even my big CNC lathe is the same way. The spindle is a massive servo with a large reduction, but even it has a big hydraulic brake to assist it when doing positional drilling operations or certain radial milling operations. If I don't engage the brake I can push and pull and get it to rotate a degree or two.
How many of these stepped shafts do you need to make? Are there any complex curves on them or are they just a shoulder with a thread? If the qty is small, get a manual lathe and just knock em out. If the quantity is large, go find a used gang tool lathe with a 5C collet nose, or a toolroom-style CNC lathe. Those can both be had pretty darn cheap, and then you don't have to spend a ton of time trying to make your mill do something it was never designed for.
Edit: I wanna say a used HAAS TL1 can be had for about the same as that rotary+drive costs you.
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