RE: [CAD_CAM_EDM_DRO] RE: Power Supplies

I believe that you were looking for a Canadian source. If you are in Toronto
take a look at Active Surplus on Queen Street. They had several nice toroids
the last time that I was in. I don't recall the exact ratings but they had
several taps so with suitable buck/boost connections you may be able to get
the voltage that you need. Also, take a look at Sayal
(http://www.sayal.com/). I have bought good but cheap supplies from them in
the past.

>-----Original Message-----
>From: CAD_CAM_EDM_DRO@yahoogroups.com
>[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Dave Halliday
>Sent: December 15, 2005 15:06
>To: CAD_CAM_EDM_DRO@yahoogroups.com
>Subject: [CAD_CAM_EDM_DRO] RE: Power Supplies
>
>Another option is making your own.
>
>Find a dead microwave oven. The transformers in them are usually good
>for 700 to 1,000 watts which is about the amount of power you need. The
>primary is almost always separate from the secondary so you can remove
>the secondary with a Dremel tool cut-off wheel. It will 'grab' so be
>careful and slow.
>
>Once the secondary is off, wind ten turns of light gauge wire and see
>what voltage you get. Figure out what voltage you want and adjust the
>number of windings accordingly and rewind it with a gauge big enough to
>support the current.
>
>Be careful when disassembling the oven -- the working voltage for the
>tube is generally in the 2,000 volt range and the filter capacitor can
>hold a nasty charge for a long long time. Discharge with a screwdriver
>and wrap a piece of wire around the terminals.
>
>Dave
>
>> -----Original Message-----
>> From: Robert Campbell [mailto:bob@...]
>> Sent: Thursday, December 15, 2005 7:56 AM
>> To: CAD_CAM_EDM_DRO@yahoogroups.com
>> 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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>http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
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>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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>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
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>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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