Power Supply for foam cutting

[toneV8]

I have wire for foam cutting:

Nickel-Chrom 0,2mm/0,008inch resistance on one meter is 16,8 ohm

Nickel-Chrom-Titan 0,4mm/0,016inch resistance on one meter is 8 ohm

How to calculate what kaind voltage and ampere I need if I use 1 meter of wire.

Does anybody have schematic for foam cutting.

[blackbeard52]

Try this....

http://nsrca.org/technical/tip_trick...wer_supply.htm

Hope it helps
Bob

[SteveC68]

I built that power supply about 2 months ago and it cannot be done for the $30 that the author claims. A few of the parts are no longer available at Radio Shack. Also the transformer listed is only good for 2 amps. I have this supply connected to a 24" bow with .018" stainless nichrome wire. With the supply set to the hottest setting it still has a lot of drag through the foam. It would work for extremely slow cutting speeds at best. How much money are you willing to spend on a power supply?

Also are you going to be using this with a CNC machine? If so are you planning on using GMFC or Jedicut (both of which have heat control from a DC power supply)?

Steve

[toneV8]

For now without cnc only testing wire and building proper power supply. So do you plane to build some other power supply.

[SteveC68]

I plan on buying a power supply already built. You can get an excellent power supply on ebay. Just search for Mastech power supply. You need at least 5 amps. If you want to build a good power supply then you will end up spending close to 3/4 of the cost of the one you can buy on ebay with almost none of the features. When I built my supply I bought most everything from mouser, and a local store. I ended up with over $50 in receipts, and a power supply that isn't that great.

[miljnor]

The trick with building your own power supply is scavenging used sources!

Otherwise your ARE better buy a pre-made because Steve is right the parts cost is close to a pre-made with a lot less features and not pretty besides.

[toneV8]

I am researching on web power supply for foam cutting. Problem is electronics - potentiometer, transformer is not a problem I have couple of them witt different voltage and ampere.

[SteveC68]

Try the power supplies on this page.

http://users.belgacom.net/hamradio/homebrew.htm

There is an 18V 4 amp DC supply that looks pretty easy to build. You have to scroll down on the left side of the page to get to the Power supply schematics.

[miljnor]

Did the sight get hacked?

this is the only forum i could post in?????

[blackbeard52]

Havent ordered from here yet but prices are unbelivable even if they are kits


http://www.anykits.com/catalog/

Bob

[blackbeard52]

A very good conversion of PC PSU..... http://www.antennex.com/preview/archive3/powers.htm

bob

[SteveC68]

How about these Power Supplies? Only problem is they are non adjustable output. However if you run a board with heat control like the HobbyCNC Foam Pro or the MM2001 and use either GMFC or Jedicut then these power supplies would work as the board and software control the wire heat using pulse width modulation I believe.

http://www.mpja.com/prodinfo.asp?number=16013+PS

Steve