Re: [CAD_CAM_EDM_DRO] Power Supplie's

Bob, [and others, I won't reply to each individually but let my say thanks
for all your input!]

I've got a fairly decent idea now of what is required to build my power
supply. Thanks for the link to your PDF, its very well written and
informative. I've also read your part 1 section of building a power supply
and was wondering if you have had time to do the other 'parts' to the
write-up? I've looked at a couple of sugested sites here in Canada and
think I should easily have all my needs met with these.

Also about the steppers, I'm wondering why the 4.5v steppers aren't the best
way to go? Their complete ratings are as follows;
Unipolar= 3.2v @ 4.5A
Bipolar[series]=4.5v @ 3.2A
Bipolar [parrellel]=2.3v @ 6.3A

The only reason I was interested in these units is the reasonable price as
well as they have dual shafts at 1/2" dia.
They are rated to produce 637oz-in holding torque [ well the uni side is a
bit less than this]. I'm building a fairly large and heavy system and would
like the max amount of power out of these units and this is why I was
looking to run my Gecko's as high as I could. I've love even more powerfull
units however I don't think the 1300oz-in level of steppers would run at
their rated power on Gecko's due to limit's set by them for power
connections.

One last question. Somplace I read that Gecko recommends we only use 65-70%
of the steppers rated amp's as the required current from our power supply.
In my case w/ the above spec's 3.2 x 4 steppers =12.8a x 0.70=8.96A. I
can't seem to find that pc of info now to double check my memory. Can anyone
confirm this?

Again, thanks for the great supply of info, you've all been a great help in
presenting the options.

Jarrett Johnson

----- Original Message -----
From: "Robert Campbell" <bob@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, December 15, 2005 9:55 AM
Subject: Re: [CAD_CAM_EDM_DRO] Power Supplie's


> Jarrett,
>
> I can help you with building your power supply. Basically all it takes is
> a
> transformer, bridge rectifier and a capacitor. From the capacitor you will
> need a separate wire and a fuse before going to each Gecko drive. I can
> make
> a wiring diagram for you. I also have a wiring diagram from my CNC router
> plans on my web page at www.campbelldesigns.com/electricalpdf.pdf. For my
> current design I use a solid-state relay to turn on the power supply when
> Mache3 has control. I use the charge pump feature off of my breakout board
> to turn on the solid-state relay.
>
> For the transformer in Canada, you can have one built by Plitron in
> Toronto.
> In the states I buy mine from Parts Express. The transformer from Parts
> express are made in China, but they normally have them in stock for next
> day
> delivery. Plitron only makes them to order and it takes about one month to
> have one shipped.
>
> 4.5 volt stepper motors may not be your best choice. Since you have them I
> would use them. The other choice is to buy new stepper motors. I sell
> stepper motors and I have them in stock. My 640 oz/in new square type
> design
> normally sell for $120 each. I do have three with a 3/8 inch shaft that I
> would like to clear out at $80.00 each. Since you will need four, I could
> add one of the 640 motors with a 1/2" shaft at the same price
>
>
> Bob Campbell
> Bob Campbell Designs
> www.Campbelldesigns.com
> Mach 2/3 breakout boards
> Relay boards
> Spindle Speed boards
> Stepper motors
> Plasma Torch Height control
>
> ----- Original Message -----
> From: "Jarrett & Heidi Johnson" <hjjohnson@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Wednesday, December 14, 2005 10:30 PM
> Subject: [CAD_CAM_EDM_DRO] Power Supplie's
>
>
>> I'm just looking for some confirmation on my power supply numbers.
>>
>> Four steppers rated at 4.5v/phase and 3.2A [all bi-polar series]. I
>> plan
>> to use Gecko 202's. Therefore 4.5v*20=90VDC, we know that the Gecko's
>> only
>> take up to 80VDC so thats my upper limit for my voltage. The ampers side
>> of things 3.2*4=12.8 @70% duty per Gecko's doc's =8.96a or call it 9A.
>> Does this all look correct?
>>
>> Does anyone know where I could find such a beast off the shelf? Or a
>> place
>> [ preferably in Canada] where I could purchase the components off the
>> self
>> to make it. Links to websites that explain building power supplies in
>> English [ vs electronic-ese]?? Ball park guess's as to what this should
>> cost ready made? I got one quote back with a total of nearly $1000USD
>> with
>> shipping.. however I was a bit off on my first set of numbers provided to
>> them so that might have an effect.. Does this sound even in the ball
>> park? I had $100ish in my head when I asked for the quote but then.. I
>> have no idea so..
>>
>> Thanks
>> Jarrett Johnson
>>
>>
>> [Non-text portions of this message have been removed]
>>
>>
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> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
> aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it
> if you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
> sister site to the CCED group, as many of the same members are there, for
> OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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