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  1. #51
    is this the right power supply ?

    please look at link

    http://www.ebay.co.uk/itm/500-Watt-A...#ht_1856wt_905

    James and Luke

  2. #52
    No, an ATX power supply is a computer power supply so although the power is fine you only get 12V (and 5V, 3.3V and some others) which is not sufficient. You will get a much higher feed-rate if the motors are run on a higher voltage. You ideally want 70 volts.

  3. #53
    I can't find the right power supply on farnell

    I found a power supply 500w but only 48v ??

    Help

    rapid web site is down so I can't look on there

    James

  4. #54
    Quote Originally Posted by luke11cnc View Post
    I can't find the right power supply on farnell

    I found a power supply 500w but only 48v ??
    Would be OK, but since your drivers can accept up to 80V it's best to do that. I can't find any on eBay that are above 50V, so I think the best option is the transformer I linked to on Rapid in post #46:

    Quote Originally Posted by Jonathan View Post
    http://www.rapidonline.com/sku/Elect.../82719/88-3840

    That one plus a couple of capacitors and a bridge rectifier, which I will already have. I can't find any on eBay at the moment ... that one is a bit expensive.
    Annoying that the site is down, but it's easy to get round - just use google cache:

    http://webcache.googleusercontent.co...w.google.co.uk

  5. #55
    Jonathan I will order the one from rapid on Tuesday

    Will I need to order anything else for it (box) or will it fit in a old computer case along with my drivers and break out board

    James

  6. #56
    Computer case will be fine. Wire is cheapest from Rapid:

    http://www.rapidonline.com/sku/Cable...119346/02-1066

    (I'll buy the spare from you)

    I emailed them and they said 2 weeks to deliver it.

    Also for the power supply I'd get a bridge rectifier and terminal strip. I'll find them tomorrow when the site is working. They will also have suitable switches for limit switches.

  7. #57
    cool thank you Jonathan

    well Luke has been in the garage/work shop for most of the day drilling the legs ready for the stepper mounts

    to say he loved it is a understatement at the end of it I received the biggest hug,smile and kiss ever and as he was walking out the door he turned around as said dad " it's been the best day ever dad I love you"

    I've taped the motor mounts with just a couple of mm to go but that's for Monday and Luke to do

    Jonathan that jig worked really well

    I think I've had the best day of my life as well

    James and Luke

  8. #58
    I have a spare torodal transformer and some 4700-100v caps and probably Br-rec that will get you 70+volts if you haven't bought them yet.
    The torod is almost new I think it's 1000va but will have to dig it out to get full specs to be sure then i'll be able to work for you the exact volts + amps.
    I think i've got 4x caps which can be wired parallel and If memory serves me I think this transformer and 4 caps was giving me around 76 ish volts and 14A ish.

    PM me If this is any use to you and I'll give you my contact details.

  9. #59
    James,
    what about something like this: http://www.antekinc.com/details.php?p=317

    Ian

  10. #60
    Quote Originally Posted by Web Goblin View Post
    James,
    what about something like this: http://www.antekinc.com/details.php?p=317

    Ian
    That would be ideal - it's just a lot more expensive than the one from Rapid, especially when you include postage.

    Quote Originally Posted by luke11cnc View Post
    well Luke has been in the garage/work shop for most of the day drilling the legs ready for the stepper mounts

    to say he loved it is a understatement at the end of it I received the biggest hug,smile and kiss ever and as he was walking out the door he turned around as said dad " it's been the best day ever dad I love you"

    I've taped the motor mounts with just a couple of mm to go but that's for Monday and Luke to do

    Jonathan that jig worked really well

    I think I've had the best day of my life as well

    James and Luke
    Sounds good...but where are the pictures?
    Last edited by Jonathan; 28-08-2011 at 06:25 PM.

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