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  1. derekkarp

    High Speed Machining Parameters

    Take a look at Helical end mills. www.1helical.com We're running 500 sfm in 6-4 Ti. The key to HSM Ti is very small stepovers. You want the cutter out of the cut much more than in the cut. Say 10-15% radial stepover. Since you are taking such small stepovers, the only way to make up for...
  2. derekkarp

    Spotfacing on Castings

    Thanks guys. The part is too big to use a BP or drill press. The features also have to be bought off on the machine also. Our designer is coming up with a spring loaded micro stop for a CNC machine. I'll let you know how it works. -Derek
  3. derekkarp

    Spotfacing on Castings

    None of those options are acceptable. 1. Its not our part. Its for a large jet engine company. The part has been in production for 15 years. Getting a print change is impossible. 2. We HAVE to cut major hours (200+) out of this part. Fixturing it from that surface is impossible...
  4. derekkarp

    Spotfacing on Castings

    I'm sure someone here has ran into this problem before. We have to put counterbores, or spotfaces, whatever you want to call them into a cast surface. The dimension is held from the cast surface. Since our castings vary more than the tolerance given on the depth of the spotface, we're having...
  5. derekkarp

    Unigraphics Vs. Surf-Cam?

    Surfcam may be easier to learn, but is not better, IMHO. UG CAM is probably the most powerful CAM software available. You have total control over the tool, and is highly customizable for your site. It all comes down to what kind of work you do. Big selling points of UG are associativity...
  6. derekkarp

    How to remove the rapid move from postprocessor

    You will be alot happier if you can learn to live with rap1, rap2, rap3. I suppose you could abort the event, but I wouldn't recommend it. Just my opinion. To answer your other question, which isn't too clear, 'initial move' happens right after a tool change. First move is like an initial...
  7. derekkarp

    How to remove the rapid move from postprocessor

    Short answer........You can't remove rap1 rap2 or rap3. -Derek
  8. derekkarp

    Machining - engage/retract problems

    This is what I've always done if I wanted to start exactly in the center of a hole without using predrill points. 1. Hole dia - cutter dia = A 2. A / 2 = B 3. B / 2 = C 4. Set arc engage size to C. Set horizontal clearance to C (NX 5, set arc 90 degrees). 5. Set cutcom minimum angle to 45...
  9. derekkarp

    auto add to ref sets

    (and don't confuse this with Visible in View as that's something we would really like to get people to stop using) Please, please remove this function!! I detest it. I have a few stubborn co-workers who insist on using this to turn on and off layers. First they go to 'Visible in View', turn...
  10. derekkarp

    multiple mill position

    Transform or instance the operations like jelmerra says, then put the transformed operations in a new MCS with a different coodinate system. There is no need to transform the models, or any solids. -Derek
  11. derekkarp

    How to add new UDE in manufacturing

    You know there is a custom command already included in UG for a Z/W axis. You only need one post. Unless your machine is different than what I'm assuming. But to answer your question, you need to link the posts inside the post. There is a tab for linked posts, you need to point to each...
  12. derekkarp

    space pilot or space navigator?

    If I had a choice, I'd get the Space Pilot. It has more functionality. Works great. -Derek
  13. derekkarp

    5 axis machining

    UG has a tutorial called CAST. It is an awesome way to learn. -Derek
  14. derekkarp

    Oversize bearing bore

    I don't know if this would work in your application, but I've knurled oversize bores to get a press fit. Keep in mind the contact area is dramatically decreased, and your bore might not hold your bearing anymore. Use a straight knurl. The bad thing is cast iron doesn't knurl too well, but you...
  15. derekkarp

    Inverse time feed rate

    Taken from MMS online: "C. Inverse Time Feed Control Most NC programmers think of the F-register in a CNC controller as the method for specifying linear velocity, i.e. uPM or uPR. This is true for two- and three-axis linear motion, but when rotary motion is to be controlled, the F-register...
  16. derekkarp

    more on tapping aluminum

    I disagree ssn596. I think Helicoil is the proper fix. In fact your helicoiled threads will be stronger than the original. We machine jet engine cases, and every threaded hole is helicoiled. I don't think they would do something that is second-best option. Also speaking from my own...
  17. derekkarp

    Postprocessor G68 command

    I didn't get anything from you. I guess my work probably blocked it. Try resending it to derek_karpinski@hotmail.com. Sorry, -Derek
  18. derekkarp

    Postprocessor G68 command

    well........you have two choices. Either import the custom command UG provided to handle coordinate system rotation, or, do like I did and lie to the machine and tell it your machine is a table table (to get output in a principle plane), and add G68 blocks, with tcl code, everytime there is a...
  19. derekkarp

    Postprocessor G68 command

    The only enchancement I know of for G68 is in the IS&V. I had reported a problem with how the tool tip gets transformed and rotated. Its fixed now. Other than that, you'll have to work with what UG provides you, or write your own tcl code to handle G68. What excatly is your problem? -Derek
  20. derekkarp

    Postprocessor G68 command

    Yes it does..........This is the secret. You need to lie to the post builder and tell it the machine is a table-table machine. That way everything is always in a principle plane. Just make sure that you have the G68 activated for every new B axis rotation. What machine are you making a post...

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