Setting up kinematic model parameters for DMG DMU50v
Close
Login to Your Account
Likes Likes:  0
Results 1 to 16 of 16
  1. #1
    Join Date
    Oct 2006
    Location
    Petaluma CA 94952
    Posts
    484
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    75

    Default Setting up kinematic model parameters for DMG DMU50v

    Im working to get a 5 axis post written for my 2000 DMG DMU50v. Ive been using my old Maho cnc 432 post that actually works ok for 3+2 stuff.
    Anyhow, I see that the machine constants MC600-MC699 for describing the kinematic model are all set to 0. Without a kinematic model entered in the constants, the machine cant use the controls internal math for G7,(tilting planes),G141(3d tool comp),G174 and other 5 axis related internal calculations. My post guy wants to be able to use these commands. Anyone out there with one of these machines that can give me a set of constants for 600-699?

  2. #2
    Join Date
    Oct 2006
    Location
    Petaluma CA 94952
    Posts
    484
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    75

    Default

    Well, I did get the DMG manual from DMG tech support for setting the machine constants 600-699 to call a G7 and G141. Its very detailed and not a simple procedure at least to me. If anyone needs it pm me. Again, if anyone has actually done this procedure and has any tips, Id appreciate it.

  3. #3
    Join Date
    Oct 2006
    Location
    Petaluma CA 94952
    Posts
    484
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    75

    Default

    Ok,kinematic chain is entered and now the machine accepts G7 commands, does tilted planes etc. However, it still wont accept a G141 command. The tech that gave me the info for setting up G7 transferred my query to the DMG application engineer dept to get help with that. Still waiting for a call back. I browsed the parameter description and didnt see any ones that looked connected to a G141 not working.(I did make sure MC263 (3d tool function) is turned on.) Anyone more familiar with these controls have any suggestions? Maybe a copy of your parameters from a similar machine so I can compare?

  4. #4
    Join Date
    Dec 2017
    Country
    UNITED STATES
    State/Province
    Ohio
    Posts
    17
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    1

    Default

    Quote Originally Posted by markp View Post
    Ok,kinematic chain is entered and now the machine accepts G7 commands, does tilted planes etc. However, it still wont accept a G141 command. The tech that gave me the info for setting up G7 transferred my query to the DMG application engineer dept to get help with that. Still waiting for a call back. I browsed the parameter description and didnt see any ones that looked connected to a G141 not working.(I did make sure MC263 (3d tool function) is turned on.) Anyone more familiar with these controls have any suggestions? Maybe a copy of your parameters from a similar machine so I can compare?
    Just send you a PM (at least I think I did), if you could e-mail the kinematic model setup instructions I would very much appreciate it... I can also share my Machine Constant file with you for reference; I know this thread is 3 years old but sometimes it doesn't hurt to have extra info. Thanks!!!



    Wallace

  5. #5
    Join Date
    Oct 2006
    Location
    Petaluma CA 94952
    Posts
    484
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    75

    Default

    Too large to post here directly. Ill send the complete file to your email. If you have a recent calibration record its a place to start. I used the one from my machine commissioning sheet for the first try. I measured and redid it to the slightly different new dimensions. The DMG tech i spoke to recommended that the machine be set to MM in the constants before setting and then set back to inch afterwards. He said the control calculates the data better that way.

  6. #6
    Join Date
    Dec 2017
    Country
    UNITED STATES
    State/Province
    Ohio
    Posts
    17
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    1

    Default

    Quote Originally Posted by markp View Post
    Too large to post here directly. Ill send the complete file to your email. If you have a recent calibration record its a place to start. I used the one from my machine commissioning sheet for the first try. I measured and redid it to the slightly different new dimensions. The DMG tech i spoke to recommended that the machine be set to MM in the constants before setting and then set back to inch afterwards. He said the control calculates the data better that way.
    Thank you for the instructions, I got everything to work! I re-calibrated the probe, checked the table's bushing (it was only 0.0002" off), and used it to re-calibrate the iniital X/Y position of the kinematic chain. Thereafter I picked 15 random places on the table surface for the initial Z value, and finally mounted a block to the table and probed a corner based on the instructions. Some of the current settings on the Kinematic model was as much as 0.0065" off... which explains why it was cutting weird even on 3+2 operations and we could never get the right dimension. (Parts-to-parts tolerance is good, but what good is it if ALL the parts have identically wrong dimensions...)

    Thanks again for the help!



    Wallace

  7. #7
    Join Date
    Oct 2006
    Location
    Petaluma CA 94952
    Posts
    484
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    75

    Default

    My machine was also offset from the G7 center of rotation. I believe this was due to a crash that the previous owner had (described in an old post in another machinist forum from an op when my machine was at the Lick Observatory machine shop).


    But...I dont have probing on my old DMU50v so I had to fix this manually. First, Measured the kinematic dimensions as described in the DMG manual I sent you. Entered this into the kinematic tables. Did this shortly after getting the machine. Before I adjusted the kinematic offset, I compensated for the offset by manually moving the features in 3+2 locations in cam to match the offset I was seeing in parts.

    Was repeatable so I left it that way for a while as DMG tech support didnt know or want to tell how to make the adjustments. They actually wanted to send a tech here for god knows how much.

    To fix, I made a square test block with pockets on 5 sides. Machined on its perimeter in XY down 2” in XYZ G7 not activated. The block pockets on top, on the left side and in the rear, were aligned within .0005. The pockets on the front side and left side, were shifted .0010 to the left.


    To fix this, changed parameter MC603 (X distance to pivot center) by adding .0010” to the -distance.
    This moves the front face and the rear face to be aligned properly.

    Now the left face and right face were shifted out of alignment .005”
    Added .005” to MC607 (Y distance to pivot point) - distance.
    Now all pockets on faces and top (non G7)are aligned.

    Z distance after transformation is still off. Checking Z0 after a G7 B5=90 C5=0 L1=1 transformation (Z transforms to Y axis) shows it is .007” out of alignment towards the back of machine.

    Add .007” to - dimension at MC 619 (Z axis pivot point to B and C axis).

    Now all axis are aligned within .0002 during G7 transformations. You can also see this in the axis position output. It does not change after rotations if the offset is correct. Then confirmed by a final test block pass and CMM check of block. I also created a radius on the top of the part from all four directions to check blending.

    .

  8. #8
    Join Date
    Dec 2017
    Country
    UNITED STATES
    State/Province
    Ohio
    Posts
    17
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    1

    Default

    Hot damn that's a lot of work... I am glad we've got probing function on our machine! The whole point we want the kinematic model to work is so we can load a very troublesome part (that we know every single one is a little bit off and hence can't fixture accurately with any repeatability), probe each one to find a defining feature that we used as origin in CAM, so the zeros are set dynamically and correctly for each part. Thereafter, we use G7 transformation to machine additional features onto several faces AND have those features intersect each other correctly. Pretty standard stuff on 5-axis machining, but without the correct kinematic model, our own cut would be off... now we can machine those items very accurately! Yay!

  9. #9
    Join Date
    Mar 2019
    Country
    UNITED STATES
    State/Province
    Minnesota
    Posts
    2
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    0

    Default

    Hello, Could you send me the kinematic model setup instructions also. I just got a DMU 50 and I also need to setup the MC600s. I would greatly appreciate.
    I also tried to send you a PM but not sure if it worked.

    Thanks
    Todd

  10. #10
    Join Date
    Oct 2006
    Location
    Petaluma CA 94952
    Posts
    484
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    75

    Default

    I can but too large to upload to PM send me a pm with your actual email

  11. #11
    Join Date
    Mar 2019
    Country
    UNITED STATES
    State/Province
    Minnesota
    Posts
    2
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    0

    Default

    I tried to send you a PM but it said you have exceeded their stored private messages. It sounds like you need to delete some PMs
    Thanks
    Todd

  12. #12
    Join Date
    Oct 2006
    Location
    Petaluma CA 94952
    Posts
    484
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    75

    Default

    I did that

  13. #13
    Join Date
    Jun 2019
    Country
    HUNGARY
    Posts
    2
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    0

    Default

    Quote Originally Posted by markp View Post
    I did that
    Hello, Could you send me the kinematic model setup instructions also? I would greatly appreciate.
    I also send you a PM but seems not worked. Thanks in advance

  14. #14
    Join Date
    Oct 2006
    Location
    Petaluma CA 94952
    Posts
    484
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    75

    Default

    Ok, As above, Ill have to have an email address. try to PM again. Thx

  15. #15
    Join Date
    Jun 2019
    Country
    HUNGARY
    Posts
    2
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    0

    Default

    Quote Originally Posted by markp View Post
    Ok, As above, Ill have to have an email address. try to PM again. Thx
    Off (sry)
    Hello. Sorry for boothering you markp. I get this error message when i tried send pm to you.

    "Errors
    The following errors occurred with your submission

    markp has exceeded their stored private messages quota and cannot accept further messages until they clear some space."
    Can you free some space? Or can i write here the email? (i think it is not accepted here...) thanks in advance

  16. #16
    Join Date
    Jun 2019
    Country
    INDONESIA
    Posts
    2
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    0

    Default

    Hi, markp
    Sorry for bothering
    I've sent PM request the kinematic manual?
    I'm not sure if its really already sent?
    could you confirm that?


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
  •