3dprintforums logo



Page 1 of 5 1234 ... LastLast
Results 1 to 12 of 55

Thread: New MHP mill project

  1. #1
    Registered
    Join Date
    Nov 2006
    Location
    USA
    Posts
    447
    Downloads
    0
    Uploads
    0

    New MHP mill project

    Hi all-

    I am in need of advice about my MHP mill I purchased. It uses the Hydropath III controller. When I got it home and connected the power and the air, the machine came to life fairly easy. I was worried because it had a rough ride on my trailer for 100 miles or so.

    After playing with it for a few days and finally figuring out most of the buttons, and learning how to do a tool change something changed. I started to get following errors on the x axis. I have a complete set of manuals for the machine, but there is not a lot of information about the “Following Error”. If I jog the machine really easy, then I can make the x axis move, but any faster and it faults out. During the few days playing with it, I cut a 2 inch hole in ˝ plate, and by using calipers it is 2 inches. There no bumps in the cut when the axis changes direction. I did not have a chance to do any more tests on run out or backlash before the problems started.

    Here is what I know about the machine-- It has a 10 HP spindle, with a pneumatic hi/low changing gearbox (50 to 5000 RPM). It has a 22 tool changer that uses BT 40 collets. It has an automatic oiler. It has a Toshiba variable frequency drive, it has some way to control the location of the spindle orientation because the spindle stops at the same position every time. The servos are 94 volts DC ( I think) and use resolvers. The z axis also has a brake on the axis.

    I started to do some simples troubleshooting on the x axis tonight, and here is what I found. With the servo disconnected from the ball screw, the servo is still getting errors, and is also jerky. The ball screw appears to be in good shape, and the ways are in great shape. They are boxed ways if that matters.

    I am planning on swapping the x and y servo driver just to see if the following errors follow the drive.

    Now for the questions---

    Should I continue trying to fix the x axis, or plan on starting swapping the electronics out and re building the mill?

    I have successfully built a 6 x 12 cnc flame table, and the hardest part for me was figuring out what electronics to use. After swapping parts and have problems, I ended up using granite devices servo drives, US digital encoders, the BOB from candcnc. I also tried the smoothstepper (which I still have) and the c23 BOB (still have this too) from cnc4pc. Power supplies from Jon at Antek.

    So what should I buy? I have been reading up about Ajax, and the DSPMC controllers. I would like to stay with the granite devices servo drive. The only reason is that I can order 1 extra drive and use it on either machine. I would also like to use and industrial PLC. I work with AB, Mitsubishi, Fanuc, Motoman, Toyopuc (Toyoda) and a few others at my day job, so I am very familiar with PLC controllers and the Ladder Logic.

    I am planning on spending between 2000-3000, to get it running.

    Any and all suggestions are welcome.


    Steve

    Similar Threads:
    Attached Thumbnails Attached Thumbnails -mhp1-jpg   -mhp2-jpg   -mhp3-jpg   -mhp4-jpg  

    -mph5-jpg  


  2. #2
    Registered
    Join Date
    Aug 2005
    Location
    usa
    Posts
    91
    Downloads
    0
    Uploads
    0
    Man am I jealous. I had an MHP 83-3000 when I had my (full time) shop and it was a tank. Congrats on a great purchase. I am not electrical, but I could provide names of two companies that still service the MHP machines.

    BTW - mine had multiple offsets using E1, E2,...E6 - six work offsets(!), which i used to advantage on more than one occasion.



  3. #3
    Registered
    Join Date
    Nov 2006
    Location
    Scotland
    Posts
    925
    Downloads
    0
    Uploads
    0
    I would think they are dc servos on this machine.May need the carbon blowing out from the brushes and the motor and tach brushes may need replacing.Something you should check anyway.A dirty comm on the tacho will also cause jerkiness.Clean it with a pencil eraser.
    Mark.



  4. #4
    Registered
    Join Date
    Nov 2006
    Location
    USA
    Posts
    447
    Downloads
    0
    Uploads
    0
    Thanks Girgley-

    I did not know about the brushes on the tack. I was/am planning on removing it to check for a loose set screw or loose wire. I will clean the brushes when I remove it.

    Underdog-

    It is built like a tank. That is why I purchased it. I figured I would have to replace the electronics sooner or later. Can you send me the name of the two repair centers?


    Steve



  5. #5
    Registered
    Join Date
    Nov 2006
    Location
    USA
    Posts
    447
    Downloads
    0
    Uploads
    0
    Here is an update-

    The servo driver is an Industrial Drive #sbfp1/2222-48-13000

    The servo motor has an encoder on it not a tack. The name on the encoder is Danaher Contoles


    Steve



  6. #6
    ok some info for ya...

    sbfp... is the INDUSTRIAL DRIVES power supply, not a servo. this is a 19" card rack unit that you plug the servo drive cards into. they are part numbers like sbd2-.... they will be different for each axis so you should NOT swap motors or drive cards w/o knowing details of each. We can share this info with you as we actually have spare parts in stock for these still. We build exact duplicate replacements for these also for large aerospace companies using new drive compnents - not something you would be interested in with $$ you want to spend on it. but perhaps we can help you get this puppy back on its feet....

    the motors DO have tachs; the bds2 and bds4 drives cannot run without them. what u see is probably a add on encoder mounted on the back of the motors. the motors have tachs built inside their rear motor endbells; 19.8v/krpm units. yES if you are careful you cal try to clean the comms with erasor - good plan mentioned earlier in thread. that very well could be the problem since it ran for a bit before starting to give xcess error.....

    the bds drives have green and red lites on them as well as full part nos on sticker on the side of the slide out alum angle bracket. get these and motor part numbers (like TT-5301-102-B-12-C and we can tell u all about them too.

    hope this helps u get it going! I can email you drive and motor data and manuals; just ask if you want. Mike@KilroyWasHere.com, Kilroy Corp, (937) 660-5313.



  7. #7
    Registered
    Join Date
    Nov 2006
    Location
    USA
    Posts
    447
    Downloads
    0
    Uploads
    0
    Mike-

    I am glad you posted your information about the mill, I had planned on swapping the drives out tonight when I got home from work.

    I will check for different model numbers tomorrow.

    I will send you an e-mail also


    Thanks again


    Steve



  8. #8
    Registered
    Join Date
    Nov 2005
    Location
    us
    Posts
    18
    Downloads
    0
    Uploads
    0

    MHP B22

    I used to work at MHP ( long time ago)
    There are still some guys in the Buffalo area who may be able to help you. I will try to dig up #s for you.
    A following error means the axis is not where it is supposed to be at any given time. Could be a lot of things. Check to make sure the ways are oiled.



  9. #9
    Registered
    Join Date
    Nov 2005
    Location
    us
    Posts
    18
    Downloads
    0
    Uploads
    0

    MHP B22

    Try these guys.
    Visimetrics
    (716)871-7070



  10. #10
    Registered
    Join Date
    Nov 2005
    Location
    us
    Posts
    18
    Downloads
    0
    Uploads
    0
    If you need help with the control I may be able to help. I used to train customers on the control. ( programming)



  11. #11
    Registered
    Join Date
    Nov 2006
    Location
    USA
    Posts
    447
    Downloads
    0
    Uploads
    0
    RR176-

    I called visimetrics, and they are going to get back with me.


    I finally had a chance to get the actual spec. numbers off of the servo drives and the only difference is 1 missing 0 on the z axis


    SBD2-16-1102-29360BA29/160-16 this is the x and y
    SBD2-16-1102-2936BA29/160-16 this is the Z axis



    Steve



  12. #12
    so you can swap the axis cards to try if you want and not hurt motors or drives. 29360 is another name for a 2936 motor - just newer model no we went to to identify some small change in brushes or something non important to you.

    actually remember if you swap the motor leads you also have to swap the tach feedback leads and control command and feedback leads too or the control will run away. be ready on the estop button when you fire it back up swapped around!



Page 1 of 5 1234 ... LastLast

Posting Permissions

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


About CNCzone.com

    We are the largest and most active discussion forum from DIY CNC Machines to the Cad/Cam software to run them. The site is 100% free to join and use, so join today!

Follow us on

Facebook Dribbble RSS Feed