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Type: Posts; User: gregormarwick

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  1. Do a similar ACME then, it's not important. ...

    Do a similar ACME then, it's not important.

    The method is not dumb, it's extremely effective.
  2. Come on man, respond on topic.

    Come on man, respond on topic.
  3. Indulge me then, and write a program in apt to...

    Indulge me then, and write a program in apt to generate, for example, a TR100x36P12 (12mm pitch / 36mm lead, three start) external thread using a 4mm grooving tool. I'm genuinely interested to see...
  4. Not what I am asking about, but definitely...

    Not what I am asking about, but definitely interesting! I could probably replicate that in FC, but it would take a fair amount of work to get such a clean toolpath, considering the irregular...
  5. So you have a small, semi-enclosed centre lathe...

    So you have a small, semi-enclosed centre lathe with a teach style control, currently equipped with a manual toolpost, and probably equipped with the original coolant pump, as a dribble of coolant is...
  6. You have probably picked up on my interest in old...

    You have probably picked up on my interest in old computer technologies, but it's a fools errand to pursue obsolete technologies in the workplace and I am careful to keep my work and my hobbies...
  7. You again! I'm beginning to think that I need...

    You again!

    I'm beginning to think that I need to learn apt just to shut you up :D
  8. So we've established that besides FC, MC also can...

    So we've established that besides FC, MC also can do this.

    Any others?

    Am I wrong that it's an uncommon feature - maybe just a seldom used one that users are not always aware of?
  9. As long as there is somewhere for the coolant to...

    As long as there is somewhere for the coolant to go, it will never develop much pressure against the tool. It can be an issue if you turn through coolant on on a tool that has no through coolant...
  10. Number of passes simply depends on tool radius...

    Number of passes simply depends on tool radius and acceptable cusp height, same as milling a surface with a ballnose.
  11. So just to clarify, it's limited to those...

    So just to clarify, it's limited to those threadforms specifically, or you can define an arbitrary cross section/threadform with a curve?



    Not sure exactly what you mean, but my typical...
  12. Replies
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    Lead angle on OP's thread is 13°25' - a typical...

    Lead angle on OP's thread is 13°25' - a typical grooving insert will have 7° of side clearance angle, so another 7° of tool tilt, some front rake ground on the holder, and you're good to go. Tilting...
  13. Using a cross section curve to drive threading passes - how many CAM supports this?

    Inspired to ask by a recent thread in the CNC sub.

    I use FeatureCAM, and I use this function reasonably frequently to generate large threads or other spiral forms (rope drums etc.)

    It seems...
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    Spiel claims increased stiffness relative to the...

    Spiel claims increased stiffness relative to the width of the cut, deeper parting than conventional per given width of blade.

    I have used the Sandvik system and it works as expected, but I haven't...
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    This same method works fine on parts like op's...

    This same method works fine on parts like op's except with a plain grooving tool instead of a full radius one.

    I use this method quite often, but it's easy for me because my CAM supports it...
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    Bob already said as much but I'll try to...

    Bob already said as much but I'll try to rephrase.

    You have conflicting specifications and some overoptimistic expectations. 0.1μm resolution is meaningless on platforms that are physically...
  17. Live tools without Y axis is pretty limited in...

    Live tools without Y axis is pretty limited in what you can realistically do. You can do a lot of end work (axial) without Y, but only very basic OD (radial) work.

    I wouldn't recommend a C only...
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    Don't have a direct comparison, sorry. Of the...

    Don't have a direct comparison, sorry. Of the machines we had quoted, the Fanuc offers were discounted stock machines and the Siemens offer was build to order with different specification so the...
  19. Kind of glossed over most of his post tbh. He...

    Kind of glossed over most of his post tbh. He said is lathe was enclosed. It could be a real machine, but of course it could also be a Denford or Enco with a 4" chuck and steppers :D
  20. By itself it maybe doesn't do much. But used in...

    By itself it maybe doesn't do much. But used in combination with directed HP coolant holders, it makes a big difference to chip formation and edge life. The 300psi that I have in that machine is not...
  21. It absolutely does help. High pressure directed...

    It absolutely does help. High pressure directed coolant turning tools are not a gimmick.

    I have two identical heavy duty lathes, the older one has basic flood coolant, probably like 15-30psi. When...
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    When I quoted an SMX a year or so ago the Siemens...

    When I quoted an SMX a year or so ago the Siemens option required a bare machine be shipped from Korea to Germany, have the control fitted in Germany, then be shipped from Germany to here...
  23. Again, not sure how relevant this is to your...

    Again, not sure how relevant this is to your specific control, but some controls are extremely fussy about function of their DC busses. I have known controls that won't even try to boot if the rails...
  24. Right, you might have mentioned some of that at...

    Right, you might have mentioned some of that at the start!

    It's very likely then that the fault you originally asked about is just a symptom and not really relevant in and of itself. And no...
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    No, but logically a sharp corner flute has one...

    No, but logically a sharp corner flute has one weak point, a chamfer corner flute has two slightly less weak points, and a radius corner flute has none. To my mind at least...

    I use corner radius...
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