K&T milwaukeematic IIIb - Page 3
Close
Login to Your Account
Likes Likes:  0
Page 3 of 3 FirstFirst 123
Results 41 to 53 of 53
  1. #41
    Join Date
    Aug 2007
    Location
    Holmen, Wi
    Posts
    199
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    15

    Default

    Here is the 3rd and 4th rigid tapping attempt. (all successful)

    we have to play with the vfd for braking and acceleration. it was setup quite a long time ago and I don't remember how it was setup. it has braking resistors but the transmission has quite a bit of rotational mass..

    1" 16 tap
    60rpm
    YouTube - kearney and trecker rigid tapping 1 inch hole.

    400rpm
    YouTube - kearney and trecker rigid tapping at 400rpm

    shot of the tool changer swapping out the 7/8" drill with the tap drill.
    YouTube - another tool change with a 1 inch tap and 7/8 inch drill

    sam

  2. #42
    Join Date
    Aug 2007
    Location
    Holmen, Wi
    Posts
    199
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    15

    Default

    Oh - this is the spindle encoder mount - showing the collet unclamping also.

    YouTube - K&T spindle encoder with collet unclamp/clamp

    sam

  3. #43
    Join Date
    Aug 2007
    Location
    Holmen, Wi
    Posts
    199
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    15

    Default

    so - here is a video with it all coming together. This is a short gcode
    program that spots, drills, taps a hole. At this time emc pauses motion
    when the tool prep is happening - so I modified my ladder so it sends
    the tool prepared bit instantly but the actual tool change is inhibited
    until the ladder is done with the tool prep. (if that made sense.) The
    program is short enough that for a few of the tools the tool change
    sequence has to wait for the prep.

    YouTube - Kearney and Trecker CNC running simple program. (tool changing and everything)

    After this video was done we played with the spindle vfd and got the
    acc/dec twice as fast.

    sam

    ps - yes the 7/8" drill is bent. (best enco had 15 years ago )

  4. #44
    Join Date
    Aug 2007
    Location
    Holmen, Wi
    Posts
    199
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    15

    Default

    finally hooked up a probe. will make things a bit easier

    YouTube - ‪Kearney and Trecker probing with emc2‬‏

    sam

  5. #45
    Join Date
    Aug 2007
    Location
    Holmen, Wi
    Posts
    199
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    15

    Default

    The old control used the spindle temp to offset the z axis. The spindle extends past the ways around 11 inches so from cold to hot is can 'grow' around .003". I had found myself 'tweeking' programs when running from cold to hot to compensate. Well I got sick of that pretty quick and the temp sensor was still in the spindle (thermistor) so I hooked that into an arduino and am using that to offset Z autmatically. So far so good - no more thinking I tracked the voltage vs temp vs growth and it turned out to be linear. Yay.

    So I just scaled and offset the voltage signal from the arduino and sent that through a few components - It goes in to a mux2 so that I don't apply the offset while the machine is homing.. Then through a limit3 component that limits its velocity, acceleration, min and max so if something goes wonky it doesn't send the axis into the limits. From there it goes through the offset component. This offsets the output and feedback from emc so that in effect - motion doesn't know that the Z axis is being adjusted. It sort of happens between emc motion control and the hardware. (In emc's the hardware abstraction layer (hal))

    Emc2 - Using temperature to compensate Z axis for spindle growth. - YouTube

    Crappy loud video...

    sam

  6. #46
    Join Date
    Sep 2002
    Location
    Lawrenceville GA USA
    Posts
    6,181
    Post Thanks / Like
    Likes (Given)
    714
    Likes (Received)
    1321

    Default

    Cool....

    Charles

  7. #47
    Join Date
    Nov 2012
    Location
    Sask, Canada
    Posts
    11
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    0

    Default

    This was (and still is) a really cool thread! Any news on this machine? Did it live happily ever after?

    Grant

  8. #48
    Join Date
    Oct 2011
    Location
    Sweden
    Posts
    56
    Post Thanks / Like
    Likes (Given)
    444
    Likes (Received)
    24

    Default

    Quote Originally Posted by Twistdrill View Post
    This was (and still is) a really cool thread! Any news on this machine? Did it live happily ever after?

    Grant
    I couldnt agree more!

    Very impressive work, i have been following this tread for a long time, and i keep looking every now and then for updates.

    And horizontals are very nice machines if you ask me, i like them alot.

  9. #49
    Join Date
    Aug 2007
    Location
    Holmen, Wi
    Posts
    199
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    15

    Default

    no new updates. This is in my dad shop - he is retired and working on his own projects. (he is always doing something) So it mainly gets used for his own projects - mostly. He takes on jobs if they are not too stressfull

    Still going strong though - and it is nice having access to such a nice stout machine.

    He has a acroloc now that he is going to convert to linuxcnc. (got it exceptionally cheap - dead control)

    sam

  10. #50
    Join Date
    Oct 2011
    Location
    Sweden
    Posts
    56
    Post Thanks / Like
    Likes (Given)
    444
    Likes (Received)
    24

    Default

    Any chance of a new video of one of these jobs running on the machine?
    I am pretty sure i am not the only one who would like to see it making some more chips and a few toolchanges.
    I think the audience will be happy just to see it move.

    I know i will!

  11. #51
    Join Date
    Aug 2007
    Location
    Holmen, Wi
    Posts
    199
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    15

    Default

    Sure - when we run something of any quantity - I will make a better video

    Don't know if this was posted or looked at - simple hand changing of tools (our probe need to be plugged in so doesn't make for automatic tool changing.)

    Probe and mill - YouTube

    some cylinders we bored/honed then this proccess was putting an o-ring notch in each end. Slap it in the chuck - probe for center and surface - mill grove. (not high production < 20 parts.)

    sam

  12. #52
    Join Date
    Oct 2011
    Location
    Sweden
    Posts
    56
    Post Thanks / Like
    Likes (Given)
    444
    Likes (Received)
    24

    Default

    Great!!

    Looking forward to see more of this old hot rodded hmc in action.

  13. #53
    Join Date
    Aug 2007
    Location
    Holmen, Wi
    Posts
    199
    Post Thanks / Like
    Likes (Given)
    1
    Likes (Received)
    15

    Default

    Still kicking!





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
  •