Recent content by RobiD

  1. RobiD

    3-Axis Stepper Controller

    It definitely is not that exciting for a 5 hour trip. It's been many years since I've been to Bundaberg.  It's a nice part of the world from there to the top. David
  2. RobiD

    3-Axis Stepper Controller

    Dazza, Where in Queensland, I'm on the Gold Coast.
  3. RobiD

    3-Axis Stepper Controller

    Hey Dazza http://pminmo.com/ I am going to build the descrete.html X 3 and the Interface - 4 axis - modular BOB (break out board) There is also a discussion forum which is also very helpful. By the way Dazza is a very Aussie type name, are you in Australia? David
  4. RobiD

    3-Axis Stepper Controller

    Thanks for everyone's input with this project. I have decided to build a driver that can run upto 6A motors in a modular design that I have found. I really enjoyed building this one as it gave me lots of knowledge. I figure the UCN cooked from too high a current draw. I have lots of these...
  5. RobiD

    3-Axis Stepper Controller

    Thanks for your reply MP. I rechecked the motor and it's only 1.2 amp. Should it have been able to handle it? What about the power supply setup, would this have had any roll. If I want to run 3amp motors, (Unipolar) what is the best way to do it? Further advice greatly appreciated. David
  6. RobiD

    3-Axis Stepper Controller

    Well, it really does give out smoke. Maybe someone can tell my why. I have been running the board on 12vdc from a computer powersupply.  I read an article on how to put 2 computer PSU's in series to make 24vdc.  Followed the instructions and it produced 24vdc. With the new motors I mentioned...
  7. RobiD

    3-Axis Stepper Controller

    I have 3 x 24vdc 3.25 amp and 3 x 24vdc 3.1amp SanyoDenki motors. What is the highest amperage that is ok to run with this board? David
  8. RobiD

    3-Axis Stepper Controller

    I did have 3 NMB PM55L-048 by Minebea but these were missing steps due to poor torque.  They would hardly make the UCN's hot. I came across some Sanyo Denki Step-Syn motors which have a higher torque rating and a higher amperage per phase.  These are 24vdc motors but at the moment I am running...
  9. RobiD

    3-Axis Stepper Controller

    Yeh, I'm interested in this question also. I've put stronger motors on my CNC and now the UCN's are getting so hot the motor cuts in and out, so now I have to put heatsinks and a fan over them. David
  10. RobiD

    3-Axis Stepper Controller

    All is good with the new dremel now. Thanks David
  11. RobiD

    3-Axis Stepper Controller

  12. RobiD

    3-Axis Stepper Controller

    Just an update. Everything works fine if I run the dremel at a slow speed. Only problem is it pulls the cutting tool through the work faster than it can cut. I have slowed down cutting speed, but if I go any slower... well you know. There must be a simple solution. David
  13. RobiD

    3-Axis Stepper Controller

    Maybe I misunderstood what you asked. Here is a link to the project: http://www.electronics-lab.com/projects/pc/008/ I had taped all three motor leads together, I undid this and there is an improvement, now when the motor is running, the z axis goes to, say the cut is -1.5mm, it will lower to...
  14. RobiD

    3-Axis Stepper Controller

    My board layout is this 3-Axis Stepper Controller, built exactly as specified in this project. For power, I am using the 12vdc output of an old AT switching power supply which is just placed next to the board on a table as to utilise the fan from the PSU to cool the chips on the board. I am...
  15. RobiD

    3-Axis Stepper Controller

    MP, Just another thought, I just read an article on shielding electronic boards from interference, and it mentioned that switch mode power supplies (of which I'm using an old AT power supply) can cause interference in circuitry. I have the PSU pushed up against the board and am using the fan...
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