Page 4 of 22 FirstFirst ... 2345614 ... LastLast
  1. #31
    Can I ask what power solution you are using to get 68v?
    A toroidal transformer 24-0-24v in series with one rectifier and two caps
    ..Clive
    The more you know, The better you know, How little you know

  2. #32
    Neale's Avatar
    Lives in Plymouth, United Kingdom. Last Activity: 2 Hours Ago Has been a member for 4-5 years. Has a total post count of 968. Received thanks 164 times, giving thanks to others 5 times.
    Quote Originally Posted by Clive S View Post
    A toroidal transformer 24-0-24v in series with one rectifier and two caps
    Actually, I'm using a 2x45V toroidal with both windings strapped in parallel to give a single 650W supply. Same thing, really!

    My first router used LinuxCNC (cheap - nothing cheaper, in fact) and a parallel port to a cheap breakout board. No spindle (speed or start/stop) control. Old analogue drivers. It worked. Not ideal in many ways, but you don't always need "the best". But you do need something that works for you, and it does need to be reasonably reliable. Best thing, I guess, is to try to understand what compromises you are making by going cheaper and deciding if you can accept that for the time being. The other thing to keep in mind is, "Can I easily upgrade it later?" For example, changing a motion controller or stepper drivers is not too invasive. But changing ballscrews for leadscrews, or supported rails for profile rails, might be more difficult later.

    I have probable spent around 2500 on my steel-framed, ballscrewed, profile railed, motion-controlled, 1500x750 router. That's probably typical.

  3. #33
    JOGARA's Avatar
    Lives in Derby, United Kingdom. Last Activity: 2 Hours Ago Has been a member for 0-1 years. Has a total post count of 161. Received thanks 5 times, giving thanks to others 39 times.
    Would something like one of this work?
    http://www.airlinktransformers.com/c...Filter+Results

    They have 70+70V so would mean 2 sets of 70V?
    From what I know, you can connect these in parallel though you have to be careful to get the phases the correct way round?

    As for the rating, thinking 2000VA?

    As for caps, 110v and as big as i'd like?

  4. #34
    Quote Originally Posted by JOGARA View Post
    Would something like one of this work?
    http://www.airlinktransformers.com/c...Filter+Results

    They have 70+70V so would mean 2 sets of 70V?
    From what I know, you can connect these in parallel though you have to be careful to get the phases the correct way round?

    As for the rating, thinking 2000VA?

    As for caps, 110v and as big as i'd like?
    Ok what DC voltage to you want to end up with. What steppers are you using and how many.

    Read #31 again 650VA should be more than enough try and get caps that are 100V

    http://www.airlinktransformers.com/c...Filter+Results
    Last edited by Clive S; 25-02-2017 at 08:18 PM.
    ..Clive
    The more you know, The better you know, How little you know

  5. #35
    JOGARA's Avatar
    Lives in Derby, United Kingdom. Last Activity: 2 Hours Ago Has been a member for 0-1 years. Has a total post count of 161. Received thanks 5 times, giving thanks to others 39 times.
    Quote Originally Posted by Clive S View Post
    Ok what DC voltage to you want to end up with. What steppers are you using and how many.

    Read #31 again 650VA should be more than enough try and get caps that are 100V

    http://www.airlinktransformers.com/c...Filter+Results
    Going off what people said, higher voltage the better? So close to the max of the drivers.

    As for the drivers, http://www.zappautomation.co.uk/elec...ion/em806.html (buying direct from manufacturer in China)
    Steppers, http://www.zappautomation.co.uk/elec...ion/em806.html

  6. #36
    Neale's Avatar
    Lives in Plymouth, United Kingdom. Last Activity: 2 Hours Ago Has been a member for 4-5 years. Has a total post count of 968. Received thanks 164 times, giving thanks to others 5 times.
    Quote Originally Posted by JOGARA View Post
    Going off what people said, higher voltage the better? So close to the max of the drivers.
    ...which is what you will get if you use a lower voltage transformer. Yes, I know it doesn't sound right, but in practice a 45V or so transformer will end up giving you around 68V DC across the smoothing capacitor(s). This also gives a bit of allowance for the fact that the mains input voltage will vary, and the transformer will probably give you about 5% over the rated voltage under light load to allow for a drop when on full load.

    EM806 are good drivers.

  7. #37
    Quote Originally Posted by JOGARA View Post
    Going off what people said, higher voltage the better? So close to the max of the drivers.

    As for the drivers, http://www.zappautomation.co.uk/elec...ion/em806.html (buying direct from manufacturer in China)
    Steppers, http://www.zappautomation.co.uk/elec...ion/em806.html
    Those are 80V drives so run them at about 68V to allow for the back emf. 24-24 v in series = 48 = about 68V dc when rectified.

    AM882 drives would be less dosh and just as good.
    ..Clive
    The more you know, The better you know, How little you know

  8. #38
    Snap
    ..Clive
    The more you know, The better you know, How little you know

  9. #39
    JOGARA's Avatar
    Lives in Derby, United Kingdom. Last Activity: 2 Hours Ago Has been a member for 0-1 years. Has a total post count of 161. Received thanks 5 times, giving thanks to others 39 times.
    Quote Originally Posted by Clive S View Post
    Those are 80V drives so run them at about 68V to allow for the back emf. 24-24 v in series = 48 = about 68V dc when rectified.

    AM882 drives would be less dosh and just as good.

    Ohhh
    I thought it was 1:1 from transform through rectification.
    That makes sense why so many are doing 24-24v.

    These are the drivers I am getting https://www.aliexpress.com/store/pro...615.0.0.9rnD8Q

    Forgot I changed to them.


    Am I right in saying that when the steppers start up or change direction, they require a lot of amps, but when they are going it is pretty low.
    Which is why you are able to get away with lower wattage transformers?



    Thanks

  10. #40
    Am I right in saying that when the steppers start up or change direction, they require a lot of amps, but when they are going it is pretty low.
    Which is why you are able to get away with lower wattage transformers?
    A 625 va trans former will be fine good choice on the AM882
    Last edited by Clive S; 16-03-2017 at 10:43 PM.
    ..Clive
    The more you know, The better you know, How little you know

Page 4 of 22 FirstFirst ... 2345614 ... LastLast

Similar Threads

  1. New 6040 owner looking for advice from others with a chinese 6040/3040
    By itsmillertime in forum Machine Discussion
    Replies: 11
    Last Post: 06-01-2016, 01:45 AM
  2. Newbie question re converting my 6040 machine to use a laser
    By GaryWilliams in forum Laser Machines & Building
    Replies: 2
    Last Post: 19-10-2015, 03:09 PM
  3. 10 / 15mm thick 6061 aluminium alloy sheet ?
    By rnr107 in forum Marketplace Discussion
    Replies: 10
    Last Post: 14-01-2014, 12:15 AM
  4. FOR SALE: Polypropylene compound
    By Bjh1985 in forum Items For Sale
    Replies: 0
    Last Post: 08-09-2013, 09:39 AM
  5. NEW MEMBER: Newbie From China
    By jenniferxu in forum New Member Introductions
    Replies: 1
    Last Post: 04-01-2011, 06:02 PM

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
  •