bar pulling hex on a Okuma lathe with no spindle orientation. Fanuc 18i-T
Close
Login to Your Account
Results 1 to 12 of 12
  1. #1
    Join Date
    Jul 2013
    Location
    Indiana
    Posts
    3,274
    Post Thanks / Like
    Likes (Given)
    4804
    Likes (Received)
    1651

    Default bar pulling hex on a Okuma lathe with no spindle orientation. Fanuc 18i-T

    Anyone have a slick way to position the spindle to pull hex on a machine with no M19 or spindle orientation? Not crazy about the store bought pullers claiming to pull hex. Can't turn the hex off of the front to make it round then pull.

    Its 1 3/8" aluminum hex.

    Anyone know the spindle orientation option parameter for a Fanuc 18i-T? Isn't this is a fairly basic feature of a lathe? Are the chances good this could be turned on without different firmware or additional hardware?

    A machine that will synchronize the spindle to thread has to know where the spindle rotational position is, don't it? Thanks...

    Brent

  2. #2
    Join Date
    Dec 2003
    Location
    poulsbo, wa, usa
    Posts
    972
    Post Thanks / Like
    Likes (Given)
    71
    Likes (Received)
    426

    Default

    There is a puller with 2 wheels that does hex stock good ,, I used it on a SL10 a few years ago and it worked great ,, I think its called "EASY puller"

    I recall some youtube videos on it,,

    other thing that works for some parts is use your parting tool ,, cut the finished part most of the way off then kill the spindle and back off a little in X and pull the part in z . spin it back up and finish the part off ...

    if your having to hold a tight part length, run your part off grove in a little , then do the OD and front of the part then go back with the part off tool. but that way you well have 2 times your part lenght sticking out ..

    I used a parting tool a lot of times to pull stock and as long as you back off the X by like .03 I have never chipped a insert ,,

  3. Likes yardbird liked this post
  4. #3
    Join Date
    Apr 2018
    Country
    UNITED STATES MINOR OUTLYING ISLANDS
    Posts
    3,973
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    1794

    Default

    Quote Originally Posted by yardbird View Post
    Anyone know the spindle orientation option parameter for a Fanuc 18i-T? Isn't this is a fairly basic feature of a lathe?
    For a normal two-axis lathe ? No, it's not. The threading location is just a pulse, that's all they normally have for rotary feedback.

  5. Likes yardbird liked this post
  6. #4
    Join Date
    Feb 2011
    Location
    ct. usa
    Posts
    30
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    7

    Default

    there was an old trick from a seimens control
    use the G32 threading cycle
    doesn't matter what tool or where the tool is
    This is not an M19 but does get you close to what you want with a little experimentation of RPM and distance/feed
    if the M5 is read last put it in the same line as the g32

    M3S100
    G0X5.0Z10.0
    G4U.5
    G32Z10.5F.05
    M5

  7. Likes yardbird liked this post
  8. #5
    Join Date
    Jun 2006
    Location
    Massachusetts
    Posts
    3,237
    Post Thanks / Like
    Likes (Given)
    2364
    Likes (Received)
    2413

    Default

    When working with hex stock and bar pulling we simply use the cutoff tool to plunge to the full diameter .125" beyond the cutoff length and have the bar puller grab .100" of that turned diameter for pulling.

    Then when facing for the next piece after pulling we just add 1 extra facing cut due to the additional stock for pulling.

    Done it that way for years without any issues ever. Works great!

  9. Likes Philabuster, yardbird liked this post
  10. #6
    Join Date
    Jul 2013
    Location
    Indiana
    Posts
    3,274
    Post Thanks / Like
    Likes (Given)
    4804
    Likes (Received)
    1651

    Default

    Quote Originally Posted by D.D.Machine View Post
    There is a puller with 2 wheels that does hex stock good ,, I used it on a SL10 a few years ago and it worked great ,, I think its called "EASY puller"

    I recall some youtube videos on it,,

    other thing that works for some parts is use your parting tool ,, cut the finished part most of the way off then kill the spindle and back off a little in X and pull the part in z . spin it back up and finish the part off ...

    if your having to hold a tight part length, run your part off grove in a little , then do the OD and front of the part then go back with the part off tool. but that way you well have 2 times your part lenght sticking out ..

    I used a parting tool a lot of times to pull stock and as long as you back off the X by like .03 I have never chipped a insert ,,
    Interesting! I would in a million years never thought of doing that with the parting tool.

    Brent

  11. Likes npinson liked this post
  12. #7
    Join Date
    Jul 2013
    Location
    Indiana
    Posts
    3,274
    Post Thanks / Like
    Likes (Given)
    4804
    Likes (Received)
    1651

    Default

    Quote Originally Posted by rcs60 View Post
    there was an old trick from a seimens control
    use the G32 threading cycle
    doesn't matter what tool or where the tool is
    This is not an M19 but does get you close to what you want with a little experimentation of RPM and distance/feed
    if the M5 is read last put it in the same line as the g32

    M3S100
    G0X5.0Z10.0
    G4U.5
    G32Z10.5F.05
    M5
    Good idea! I could see if you fooled around with this you could get it to stop where you wanted it to. Probably repeat fairly close also.

    Brent

  13. #8
    Join Date
    Sep 2006
    Location
    Abingdon, VA
    Posts
    3,484
    Post Thanks / Like
    Likes (Given)
    4710
    Likes (Received)
    3325

    Default bar pulling hex on a Okuma lathe with no spindle orientation. Fanuc 18i-T

    I ran a 1-1/2” hex bar-pull part for years.

    I made a “puller fork”, with one leg longer than the other. When feeding into the bar in the X-direction, the long fork-leg would engage the hex bar first, and roll it (and the spindle) parallel to the inside of the fork-legs.

    Then, continuing to feed into the bar in X, both puller legs would slide over the bar flats, and not the corners.

    Allow about .005” interference for between your fork legs and the flats of the hex bar, and it would pull perfect every time, and not bugger up the hex.

    Good luck!

    ToolCat

  14. Likes yardbird, ranchak liked this post
  15. #9
    Join Date
    Sep 2005
    Location
    Oakland, CA
    Posts
    2,648
    Post Thanks / Like
    Likes (Given)
    371
    Likes (Received)
    745

    Default

    If you are running short bars in your drawtube, a rotary union, some air pressure and an o-ringed piston in the draw tube works pretty well for a bar pusher. Set a stop on your turret, unclamp, bang, clamp, go.

  16. Likes Jmaks, yardbird, Red James liked this post
  17. #10
    Join Date
    Nov 2013
    Country
    UNITED STATES
    State/Province
    Utah
    Posts
    4,802
    Post Thanks / Like
    Likes (Given)
    1266
    Likes (Received)
    2692

    Default

    If you have any room behind the lathe, it's pretty cheap and easy to build a pneumatic feeder. As Dan pointed out, a tube,a piston, and air pressure.

    R

  18. Likes yardbird liked this post
  19. #11
    Join Date
    Sep 2019
    Country
    UNITED STATES
    State/Province
    Pennsylvania
    Posts
    29
    Post Thanks / Like
    Likes (Given)
    7
    Likes (Received)
    2

    Default

    YouTube
    easy puller not setup just pull

    I haven't used one to say how repeatable to pulls are, but adding a face pass on the next part after the pull will alleviate a few thou of inaccuracy.

  20. #12
    Join Date
    Nov 2019
    Country
    UNITED STATES
    State/Province
    Missouri
    Posts
    27
    Post Thanks / Like
    Likes (Given)
    5
    Likes (Received)
    3

    Default

    Have you just tried running it like a normal shaft? I found that the bar puller will turn the chuck and line it up. Kind of like what cnctoolcat was saying.
    Try it out once, just feed it in slow.


Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •