New Machine Build LMS HiTorque Mini-Mill CNC Conversion - Page 11


Page 11 of 13 FirstFirst ... 8910111213 LastLast
Results 201 to 220 of 254

Thread: LMS HiTorque Mini-Mill CNC Conversion

  1. #201
    Registered
    Join Date
    Aug 2010
    Location
    USA
    Posts
    278
    Downloads
    0
    Uploads
    0

    Default

    WoW i have to say very nice conversation plans, very detailed very professional... and you give them away for free, THANK YOU A LOT...



  2. #202
    Registered
    Join Date
    Aug 2005
    Location
    USA
    Posts
    5
    Downloads
    0
    Uploads
    0

    Default Just a question please

    Hey Don, Again, Thank You for all of your hard work

    I just have a question, If I may ....

    There is a dimension on the X axis right end plate that I'd like to verify with you (see attachment). The drawing of the corresponding left end plate suggests that this dimension should be 0.70000in. Is that correct?

    Again, Thank You for a fine job

    Will


    oops ... never mind I got if figured out

    Attached Thumbnails Attached Thumbnails LMS HiTorque Mini-Mill CNC Conversion-end-plate-question-jpg  
    Last edited by willbow; 02-09-2012 at 08:18 PM. Reason: resolved issue


  3. #203
    Registered
    Join Date
    Aug 2005
    Location
    USA
    Posts
    5
    Downloads
    0
    Uploads
    0

    Default

    Never mind .. I got it figured out



  4. #204
    Gold Member doorknob's Avatar
    Join Date
    Jan 2010
    Location
    USA
    Posts
    2141
    Downloads
    0
    Uploads
    0

    Default

    n/m



  5. #205
    Registered
    Join Date
    Feb 2011
    Location
    USA
    Posts
    308
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by doorknob View Post
    n/m
    I don't know why but I have the message in my email and when I click to see it here NO Message
    But thanks for the answer



  6. #206
    Registered
    Join Date
    Feb 2011
    Location
    USA
    Posts
    308
    Downloads
    0
    Uploads
    0

    Default

    guys one more question. I have purchased the X2 conversion kit from cncfusion. Everything works fine except the X axis. It's always stalls for a second on either ends and then runs smoothly until it riches the other end. I tried to adjust it but nothing.
    Last night when I was working on it I realize that the ballscrew wobbles little bit by the motor coupling. It looks like is not mounted concentric to the coupling.
    Is that possible? And do I have to replace the ballcrew?



  7. #207
    Gold Member doorknob's Avatar
    Join Date
    Jan 2010
    Location
    USA
    Posts
    2141
    Downloads
    0
    Uploads
    0

    Default

    The n/m was due to my confusion - my PC was acting strangely at the time when I posted the response, and I wasn't sure that I was responding to the right thread, and so I edited the post to remove it. Glad that I was able to help.

    As for the cncfusion question, I'm not sure whether this is the right thread for this discussion (so maybe it might be good to start a separate thread about it), but I have been considering getting the cncfusion kit for my X2 (not an SX2), but I'm not sure that I like the Lovejoy couplings that they use between the motors and the ball screws. Maybe someone who has used them can comment on their suitability. I would prefer to use oldham couplings to help with possible shaft alignment problems. But I'm not sure whether motor shaft to ball screw shaft misalignment would explain your problem.



  8. #208
    Registered
    Join Date
    Feb 2011
    Location
    USA
    Posts
    308
    Downloads
    0
    Uploads
    0

    Default

    What is their website? It looks like they don't have one. If they are cheap I'll give a try.

    Sent from my HTC Sensation 4G using Tapatalk



  9. #209
    Gold Member doorknob's Avatar
    Join Date
    Jan 2010
    Location
    USA
    Posts
    2141
    Downloads
    0
    Uploads
    0

    Default

    For Oldham couplings, see McMaster-Carr



  10. #210
    Registered
    Join Date
    Feb 2011
    Location
    USA
    Posts
    308
    Downloads
    0
    Uploads
    0

    Default

    Which ones are better. The set-screw or clamp-on?

    Sent from my HTC Sensation 4G using Tapatalk



  11. #211
    Gold Member doorknob's Avatar
    Join Date
    Jan 2010
    Location
    USA
    Posts
    2141
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by Pysiek View Post
    Which ones are better. The set-screw or clamp-on?
    If I did not have a flat on the shaft, I would prefer the clamp style, but YMMV.



  12. #212
    Registered
    Join Date
    Feb 2011
    Location
    USA
    Posts
    308
    Downloads
    0
    Uploads
    0

    Default

    I do have the flat on the shafts. But no flats on ballscrew.

    Sent from my HTC Sensation 4G using Tapatalk



  13. #213
    Registered
    Join Date
    Jun 2011
    Location
    usa
    Posts
    19
    Downloads
    0
    Uploads
    0

    Default X2 overheating

    I recently installed the LMS high speed spindle kit on my X2 (went very smooth by the way) but now it seems I have an over heating problem. After about 30 minutes of running at 4000 rpm the mill just shut off. The green light stayed on, I turned the switch off waited about 2 minutes and I turned it back on, it ran about 5 minutes then shut off again. The body of the switch was very hot to the touch, it also seems that the belt housing was hotter than before the conversion. The motor housing seems to be normal (warm) Any thoughts? Also my digital rpm display only reads 1/2 the rpm's, any fix?



  14. #214
    Registered
    Join Date
    Feb 2010
    Location
    USA
    Posts
    371
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by djbird3 View Post
    I haven't put them back on the machine yet but they feel tighter than the originals so they will probably be ok but we'll see. If your getting more backlash one way than the other I would think you probably have an alignment issue or a problem gib causing more binding in one direction than the other. I doubt the ballnut is the problem.

    ~Don~
    Don,
    Alignment was my first thought, but I eliminated any chance of that. I first machined the base of the mill flat referenced from the Y dovetails, then machined the front face where the Y stepper mounts, so that is now aligned perfectly with the Y axis. I then cleaned up the slot on the slide that the ballnut bracket goes into. I'm convinced that he threads themselves are out of kilter, (if I adjust the nut so it runs smoothly with the table all the way forwards, I feel slight ball binding at the far end. The same is true if I adjust for smooth motion with the table at the back end).



  15. #215
    Registered djbird3's Avatar
    Join Date
    Nov 2006
    Location
    U.S.A.
    Posts
    116
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by AiR_GuNNeR View Post
    Don,
    Alignment was my first thought, but I eliminated any chance of that. I first machined the base of the mill flat referenced from the Y dovetails, then machined the front face where the Y stepper mounts, so that is now aligned perfectly with the Y axis. I then cleaned up the slot on the slide that the ballnut bracket goes into. I'm convinced that he threads themselves are out of kilter, (if I adjust the nut so it runs smoothly with the table all the way forwards, I feel slight ball binding at the far end. The same is true if I adjust for smooth motion with the table at the back end).
    Did you check the ballscrew for concentricity? If the shaft wobbles you will have more binding in the front than the back no matter what you do because the shaft is able to deflect more on the unsupported end which would explain why there is more backlash toward the back than the front. If it's not wobbling then it has to be misaligned with the Y. The way I do mine is I put the Y assembly on the machine and make sure the thrust bearings have plenty of preload on them so that the shaft is not sagging any. I then measure the distance between the top dovetail surface and the ballscrew on the front end and the far end. The difference should be no more than about .010" . Next I do the same thing measuring from the side of the dovetail, this way you'll know for sure if it's aligned correctly. If it's not aligning correctly then more than likely the bearing block has a problem, which should be CNC fusions problem, not yours. But no matter what, it can't be the ballnut causing the type of problem you described, recheck the alignment the way I explained carefully and you will see that the shaft is not properly aligned to the axis.

    ~Don~



  16. #216
    Registered djbird3's Avatar
    Join Date
    Nov 2006
    Location
    U.S.A.
    Posts
    116
    Downloads
    0
    Uploads
    0

    Default

    Quote Originally Posted by jstefano View Post
    I recently installed the LMS high speed spindle kit on my X2 (went very smooth by the way) but now it seems I have an over heating problem. After about 30 minutes of running at 4000 rpm the mill just shut off. The green light stayed on, I turned the switch off waited about 2 minutes and I turned it back on, it ran about 5 minutes then shut off again. The body of the switch was very hot to the touch, it also seems that the belt housing was hotter than before the conversion. The motor housing seems to be normal (warm) Any thoughts? Also my digital rpm display only reads 1/2 the rpm's, any fix?
    Did you check to see if the spindle was tighter than usual when the motor shut off? Maybe the bearings have to much preload and are overheating causing them to bind and overloading the motor controller, just a educated guess. I'm asuming you replaced the stock bearings with the ones in the kit. As far as the rpm display is concerned I don't think there's any provision in it's design to compensate for a different pulley ratio. The display only shows the rpm that is sent to it from the controller which is hard coded for a 2:1 ratio.

    ~Don~



  17. #217
    Registered
    Join Date
    Jun 2011
    Location
    usa
    Posts
    19
    Downloads
    0
    Uploads
    0

    Default

    Don,
    I replaced the speed control unit that seemed to do it for now. Thanks for the thoughts.
    Joe



  18. #218
    Registered djbird3's Avatar
    Join Date
    Nov 2006
    Location
    U.S.A.
    Posts
    116
    Downloads
    0
    Uploads
    0

    Default Ball screw and ball nut backlash tests

    I tested the replacement ball screw assemblies that I received a few weeks ago and found them to be much better than the originals. The ball nuts fit to the shafts were noticeably tighter unlike the originals which were loose fitting. The backlash I measured on the x, y, and z were .0005", .0004" and .0006" respectively. These measurements are a big improvement over the originals which ranged from .0015 to .0035. I think a good bit of the backlash measured on the new ball nuts can be attributed to measurement error and stepper positioning error which the latter could be remedied with more powerful motors. So, I guess it's safe to say now that the REX stuff is ok based on my tests. In the very near future I'll be making some parts with the mill and will do a post on how accurate or not it cuts.

    ~Don~



  19. #219
    Registered djbird3's Avatar
    Join Date
    Nov 2006
    Location
    U.S.A.
    Posts
    116
    Downloads
    0
    Uploads
    0

    Default Plan set update

    I noticed that I left an entire page out of the plan set so I corrected that error and another small mistake on the X axis exploded view sheet. The page I left out by accident was the saddle modification page and on the X axis exploded view I changed the limit switches to the correct type.

    ~Don~

    Attached Thumbnails Attached Thumbnails LMS HiTorque Mini-Mill CNC Conversion-sx2-cnc-conversion-rev-1-0-pdf  


  20. #220
    Registered
    Join Date
    Feb 2011
    Location
    USA
    Posts
    308
    Downloads
    0
    Uploads
    0

    Default

    Guys I'm at work right now and I would like to make myself a coolant catch tray. Can somebody give me a dimensions of the LMS Hi-Torque table? Please check the image for info. The dimension of inside of the table not outside.
    Thanks

    Attached Thumbnails Attached Thumbnails LMS HiTorque Mini-Mill CNC Conversion-img_4362-jpg  


Page 11 of 13 FirstFirst ... 8910111213 LastLast

Tags for this Thread

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 for manufacturing industry. The site is 100% free to join and use, so join today!

Follow us on


Our Brands

LMS HiTorque Mini-Mill CNC Conversion

LMS HiTorque Mini-Mill CNC Conversion

LMS HiTorque Mini-Mill CNC Conversion