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  1. Thunderbird336

    Cusp height to Surface roughness in Ra calculation

    Yes, I do, my question was about the theoretical surface finish calculation, I don't expect the result to be exact. I didn't want to use a formula that was just an approximation if there was something more exact. We are milling these parts in a fairly small tolerance for surface roughness so it...
  2. Thunderbird336

    Cusp height to Surface roughness in Ra calculation

    This seems like it would be an easy thing to find the answer for but after many hours of searching I cannot come up with it. I can easily calculate the cusp height for machining a surface with a ball endmill and a given stepover but I cannot find a formula for calculating the theoretical surface...
  3. Thunderbird336

    Part Spun Outline

    In turning I can select the part in Geometry -> MCS_Spindle -> Workpiece -> Specify Part and the Part Spun Outline gets created for me. I would like to do something similar in milling; the part that I am milling is cylindrical with radial grooves and many flats on the cylinder body, so the blank...
  4. Thunderbird336

    required chucking force for horizontal lathe

    What I am looking for is - if I chuck a hollow cylinder in a horizontal lathe, how much force is required for a chuck jaw (the one at the 'top', that is 12:00 if viewed from either end of the cylinder's axis) to retain the cylinder? I know that coefficient of friction factors in to this, and I...
  5. Thunderbird336

    moment calculation for chucking a hollow cylinder?

    "Chucking seems a bit complex for simply lifting an object. Usually, some sort of rotational torque is imposed on the object, i.e., like a drill, is it not? Doesn't that usually dominate?" Thanks for the reply... There are two places that I can get information on the forces applied by the...
  6. Thunderbird336

    moment calculation for chucking a hollow cylinder?

    Please forgive me if my terminology is not correct, I'm here on this forum precisely because I am not well versed in this topic... What I am looking for is - if I chuck a hollow cylinder in chuck mounted to the spindle of a horizontal lathe, how much force is required for a chuck jaw (that is...
  7. Thunderbird336

    intersection point of two askew cylinders

    Very cool! I actually forgot that AutoCAD can do 3D, I have seen it done and I have walked through a couple of tutorials but it's been a few years. I have never been denied an AutoCAD license, so if I can figure it out, that would work, thanks for looking at this and helping me see that I do...
  8. Thunderbird336

    Why do rotating shafts need demagnetizing?

    My previous employer was a steam and gas turbine manufacturer/repairer, and I believe Tmoose is dead on, his explanation is the same that I heard while I worked there. And we did do Mag-particle Inspection there, as well as Xray inspection. The shafts were required to be demagnetized always...
  9. Thunderbird336

    intersection point of two askew cylinders

    As I said to Doug (above) "The calculation seems to break down once the small cylinder is translated up past the point of intersection with the edge of the large cylinder..." the spreadsheet will not give a result once the small cylinder goes high enough that the point of intersection is...
  10. Thunderbird336

    intersection point of two askew cylinders

    I can only get a CAD license early in the morning before the design engineers arrive as I said in my post to Doug... No, cowski, this is the same problem, I thought it would be easier to describe as a cylinder, after all, the fillet edged of the pocket is a cylinder in fact and it will always...
  11. Thunderbird336

    intersection point of two askew cylinders

    Doug, That is an amazing spreadsheet! I am often astounded by what people can do with Excel. The calculation seems to break down once the small cylinder is translated up past the point of intersection with the edge of the large cylinder... I attached a screen shot of the one I am currently...
  12. Thunderbird336

    intersection point of two askew cylinders

    I will check this out tomorrow, I apologize... I did not see this until I got home and read cowski's reply to you. Gary
  13. Thunderbird336

    intersection point of two askew cylinders

    prex, seems like you understand this the best, it really is not simple at all. You can get in the ballpark figuring in a plane, but it is still pretty far off, like 1/2" or so depending upon how far up the larger cylinder the smaller one intersects... This is a similar exposition... Link I am...
  14. Thunderbird336

    why do my parts often change to a gold color and all of the lines become very thick?

    The parts that do this are imported from SolidWorks, I have attached a screen shot. I am working in NX8 and using the Manufacturing function. The only way I can get it back to the normal color is to switch to Part Navigator and uncheck the model but that means I have to regenerate all toolpaths...
  15. Thunderbird336

    intersection point of two askew cylinders

    yes, the second picture is a section thru the small cylinder, and both the large and small cylinders are in the XY plane...
  16. Thunderbird336

    intersection point of two askew cylinders

    that is in the ballpark but using the full radius as an offset gets me too far out; conversely, using the centerline of the small cylinder is not far enough out. ultimately, a pocket gets milled, it's pretty much a 'spotface' for lack of a better term. this number that I am looking for is the...
  17. Thunderbird336

    intersection point of two askew cylinders

    No, they do not intersect, that is why I included the qualifier "the farthest point" and that is precisely what is making this so tough to figure out. Since the small cylinder intersects at an angle and the system will be aligned to to the small cylinder's axis. The result of that is as you move...
  18. Thunderbird336

    intersection point of two askew cylinders

    Hello all, I have a family of parts that typically has two cylinders which intersect; I am looking for the point that is farthest from the midpoint of the largest cylinder's axis... The angle between the two cylinders is either 45° or 60° One cylinder, let's call it the main cylinder, is...
  19. Thunderbird336

    trouble with checking status of events or commands...

    John, I attached a link to a shared jpg that shows the debug output. I can see in the debug output that MOM_probex is being called but what puzzles me is the status (Active, Inactive, User Defined) is being reported by mom_command_status despite my creating a variable for it called...
  20. Thunderbird336

    Turning Tutorial Problem

    Hockeyguy, I am also very new to NX so I might be way off on answering this, but I do know that if you stand on the surface for a moment, there usually will appear and ellipses ... click it and then you are presented with a submenu that you can choose the underlying objects from. As you mouse...

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