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  1. #13
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    Mar 2016
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    42

    Re: Requirements for rebuild

    The ACORN itself requires 500mA which is listed in the ACORN's manual http://www.centroidcnc.com/centroid_...pec_manual.pdf. I would not recommend using the same supply to both supply your motor bus voltage as well as the logic for ACORN. The ACORN is shipped with a 5V/24VDC power supply. I would highly recommend looking through the ACORN with Leadshine schematic.
    Attached Thumbnails Attached Thumbnails ACORN_Leadshine_DM.jpg  

  2. #14
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    Apr 2018
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    32

    Re: Requirements for rebuild

    Thank for the help. I have the stepper controller and the Acorn on their way. I just have to get myself a PC to run it, and being a Mac person for just about the whole of my life, this is going to be interesting.

  3. #15
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    Join Date
    Jan 2005
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    10559

    Re: Requirements for rebuild

    Quote Originally Posted by TinyWork View Post
    Thank for the help. I have the stepper controller and the Acorn on their way. I just have to get myself a PC to run it, and being a Mac person for just about the whole of my life, this is going to be interesting.
    You won't notice a lot of difference, the modern Mac is very similar to use, keyboard can catch you out some times, but once the Acorn Centroid is loaded you will be working in that software, what goes on in the background won't be of any concern
    Mactec54

  4. #16
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    Sep 2005
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    1093

    Re: Requirements for rebuild

    I have the stepper controller and the Acorn on their way.
    What stepper controller you will use ?

  5. #17
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    Apr 2018
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    32

    Denford MicroMill 2000 rebuild

    I've been able to snatch a few minutes here and there to almost completely strip the interior of the Denford MicroMill ready for installing new parts. There are a lot of relays used in this machine, but I reluctantly admit to not knowing what a relay does or how important they are. This is what it looked like before I started:


    After a few hours over the weekend it looked like this:


    I'll gradually add back in components, starting with power supplies to both the MX3660 and the Acorn, and then start on wiring those up.

    I genuinely have no idea what I'm doing so any help at all will be appreciated. For example, do I need all those relays? Which ones are essential? Does the Acorn and MX3660 have relays built it so I can bypass these?

  6. #18
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    Jan 2009
    Posts
    304

    Re: Denford MicroMill 2000 rebuild

    Quote Originally Posted by TinyWork View Post
    Hello, firstly apologies for my ignorance.

    I have an old Denford CNC mill that I'd like to strip out and replace the legacy control hardware with newer hardware, software and connectivity. I have read some projects where users have upgraded some parts of it, but I'd like to strip it out entirely and start again. The machine has seen little use, and only on soft materials, so is a good candidate for upgrading.

    If I strip out all of the electronics from the back of the cabinet, what will I need to replace it? I've pretty much decided on the Centroid Acorn controller, so along with that and a power supply, what else will I need to control the stepper motors and spindle – or can I simply plug everything in to the Acorn and it's complete?

    I may in time add further upgrades, like tool height measurement and probe (the machine already has limit switches) and I will almost certainly upgrade the spindle to a faster one fairly soon, but I'm most concerned with getting the mill connected to a computer and controlling the 3 axis and spindle accurately for now.

    Thanks, Steve
    DENFORD MICROMILL;
    Make sure you go to the Denford site and review all info on this mill;
    Denford Software & Machines • View forum - Micromill / Microturn

    CIRCUIT DIAGRAMS;
    Denford Software & Machines • View topic - Circuit Diagrams

    Hope this helps,

    Iron-Man

  7. #19
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    Apr 2018
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    32

    Re: Denford MicroMill 2000 rebuild

    Thanks Iron, I have all of those but don't understand electrical diagrams at all. I'm going to try to do this with a bit of logic, a sprinkle of common sense and a truck load of help from all of you. I genuinely have no idea what I'm doing, but I know what I want to achieve.

    Over the next couple days I'm going to figure out where I can put the replacement components (I now have two power supplies instead of one transformer) and how to easily wire those up, starting with the stepper controller as this seems to be the easiest to connect (power, stepper feeds, e-stop, main board comms). I need to get rid of as many relays as possible to make room for its power supply though.

    Cheers, Steve

  8. #20
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    Apr 2003
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    346

    Re: Denford MicroMill 2000 rebuild

    Quote Originally Posted by TinyWork View Post
    I may need to use the relays relating to the speed controller and spindle, but apart from that I can strip everything else out entirely. If anyone is interested in the parts please let me know.
    Hiya T/W; I have a Denford MicroMill & would be interested in some/all of the old parts. PM me with details please
    Milton in Tennessee ya'll!

  9. #21
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    Apr 2018
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    32

    Re: Denford MicroMill 2000 rebuild

    No problem DB, I'll just finalise what I do and don't need first then you're free to make me an offer on the pile.

    Having thought about placement of parts I still need a bit more room than what is shown in the picture above for the power supply to the stepper controller. I've attached a picture of the back panel with different parts highlighted. Purple appears to be a line filter for the supply, so I'll keep this. Greens are ring through which supply power is fed through. No idea what these are or what they do. Orange are proper relays with switches. They will have an important job so will be kept. My biggest issue is with the cyan block. These are described as relays but I can't see any switches in them, they just look like cable connectors to me. Am I correct? If so, I could easy drop a few of these to make room for the power supply.



    Help appreciated.
    Steve
    Attached Thumbnails Attached Thumbnails IMG_5607.jpg  

  10. #22
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    Feb 2008
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    260

    Re: Denford MicroMill 2000 rebuild

    Those are not relays.

    Those are just terminals, for connecting one wire to another.

    They are also used to connect multiple wires together, using the jumper bars that are installed horizontally in the middle (joining multiple adjacent terminal blocks together).

    There is a slight possibility that the four larger beige ones are fuse holders, but only if there is a removable piece you can pull out of the middle, with a fuse in it.

  11. #23
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    Apr 2018
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    32

    Re: Denford MicroMill 2000 rebuild

    Thank you. I called Denford before your replied and they confirmed exactly what you said. A chap named Jay Summet is also helping me out (being by default the Denford go-to man from his excellent blog articles) and he also said this.

    From that info I was able to complete the high voltage wiring. Both circuit boards are able to use 24V supplies - the Acorn only requires approx 1A whereas the MX3660 requires a lot more to drive the three 2A stepper motors. The Acorn comes with a power supply as part of the kit, but mounting it has caused headaches, and similarly but even more so with the 48V/7.5A supply I bought for the MX. I'm now going to scrap both of these and use two smaller DIN rail mounted power supplies, both 24V (the MX can use anything from 20-60V). As I'm not worried about speed, the PSU for the MX is only rated at 4.2A. Once both PSUs arrive I can mount them and then complete all of the HV components, which are: 2x PSU, spindle controller and a spare. I'm thinking of adding a high speed chip blower later, so this will come in handy. All HV outs are fused on the live wire with the supplied fuses (6.3A for spindle, 3.15A for others) but I imagine I may have to change some of these, but what to I have no idea. Help is always appreciated.

    This is the first time I've done anything remotely electrical. The only previous experience I've had is wiring a wall plug – and that was only because there's a picture inside saying where the wires go!


  12. #24
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    Apr 2018
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    32

    Re: Denford MicroMill 2000 rebuild

    We have lights!

    Attached Thumbnails Attached Thumbnails IMG_5611.jpg  

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