we had similar problem on a cnc in work, we upped the spindle speed to as fast as we could go without casuing problems. not saying its the right thing to do as the machines groan like mad now but it helped stop the swarf strings jamming the conveyors up
Tips are designed to produce comma shaped chips that are easily removed from the machine, and don't clog things up, and they would produce such chips if being used within their intended feed and depth ranges. Longer spirals suggests you're slightly outside the range for the tips you have. That's generally ok, a bit outside the envelope (in any direction) works fine in my experience, but as you are having some difficulties it would be better to have the tip cutting within it's range for now. So adjust feed and depth until you find a combination that gives comma chips.
It is not my own work, but I had the the same question and went looking a couple of weeks ago. I have not tried any machining yet, so it may not help that much. I think 'ap' is depth of cut, and 'f' is feed rate.
I'd love to run it faster than 800rpm (actual 927) but my inverter* struggles with cuts > 2mm at that speed with enough feed.
But it's better than it was. Now cutting 1.8mm with 0.1mm feed @927rpm is producing 30-50mm curls.
Happy days.
* It should run the M300 @ 12amps per channel all the way up 2400rpm, but it doesn't. So when I pick the Tom Senior Light Vertical bits up from slideway services I'll put the inverter off the lathe on that, and buy a beast for the M300
You you struggling with depth of cut at that speed? 900 odd rpm reduce your spindle speed to 400-500rpm and you with be able to take a deeper cut and your tip wont burn out.
As to the swarf issue 0.1mm is a finishing feed rate, with that tip you have got there you should be roughing at about .22-.25 mm per rev at a 2 mm depth of cut, on the radius, so 4mm on the diameter.
Finish cut, depending on the type of material depends on the depth of cut, low carbon steels will leave a furry finish wih anything less than .5mm depth of cut finish pass, preferably a mill. But feed should be .1-.12 maybe .15 depending on required finish and speeds you could bump up to 800.
I would just ask why are you holding this piece of material in reverse jaws and not in regular jaws?
That's a 200mm chuck, with external jaws they would be sticking out too much and not have enough thread engagement. Not pretty and not the correct way to do it but needs must.