|Jan 11, 2013, 03:48 PM|
However, please do read his posts to understand the spreadsheet. vtdiy is very helpful; so, if you have any questions, please don't hesitate to ask him. I finally got my electronic components figured out. I am ready to build a complete cutter. I will post my results soon.
|Sep 27, 2013, 08:33 PM|
Joined Dec 2008
Hi electronics gurus , I realize this is an old thread but need advice on power supply. I just bought a 5 amp 12 volt power supply to controlled with a 1000 watt dimmer . I was hoping to use mig welder wire . Not sure of the diameter but it does look thinner than say .020 . I'm not at all an electrically minded person and was hoping to get some advice on whether this will be enough power . I'm thinking of making a 3 foot bow . Will the 5 amp be enough ? I think it's Acdc current . The guy at the electronic supply said the dimmer should go on the output side on the power supply on the positive wire . Does this sound right ?
|Sep 27, 2013, 10:20 PM|
Hot Wire Cutter
You definately need to put the dimmer on the AC side (input) of your power supply. If your power supply does not have a transformer, then you need to get one for safety purposes (to provide isolation, to prevent shock). Here is an Instructable that is pretty good:
If you have trouble with the mig wire, consider this:
If you want to simplify all of this, and make life easy and safe, consider this:
I didn't have much luck with a bow cutter. This one for tapered wings, however worked pretty good for me:
Best of luck!
|Sep 28, 2013, 01:51 AM|
Joined Nov 2003
Can you provide details of exactly what "5 amp 12 volt power supply" and "1000 watt dimmer" you have ?
If it's a regulated supply putting the dimmer on the input side won't do anything.
If it's a DC supply then most dimmers will not work on the output side.
And 12V is not enough for most 3ft long bows but it does depend critically on EXACTLY what wire you're using (I've got wire of 5 different sizes and materials for my MIG welder).
|Sep 28, 2013, 10:36 AM|
|Dec 01, 2013, 05:42 AM|
Joined Jun 2012
Battery Charger + Dimmer?
I am looking to build a hot wire foam cutter. I am wondering if I can use the following battery charger and add a Lutron rotary dimmer to it for variable output:
Maypole 716 12A Metal Battery Charger 12/24V
Current: 9/4 Amp
My wire cutter spec is as follows (used an online calculator to get the spec):
Temperature: 300 C
Length: 1200 mm (47 inches)
SGW: 22 (0.635 mm)
Volts: 15 volts
Amps: 3.62 amp
Watts: 54 Watts
Resistance per foot (OHMS): 1.055
Total Resistance: 4.176
Your help and advice is much appreciated.
|Dec 01, 2013, 06:40 AM|
Update : guys , our sliding plank hot wire cutter didn’t work , so we got out the old HW Bow ... Stainless fishing leader wire.. Worked fine... Used the Variac (it’s what I had ) with Safety considerations... No problem ....
Here’s the finished project ... The Rolling Hanger ... Styrofoam , covered with canvas ...
Ps. the hole in the side is for the AC ...
|Dec 01, 2013, 04:50 PM|
Here's a good cutter plan, complete with safety features................ http://www.utahflyers.org/index.php?...ask=view&id=37
|Dec 01, 2013, 05:01 PM|
New Zealand, Canterbury, Rolleston
Joined Oct 2011
Just remember that though a Variac uses transformer principles it is not an isolating transformer. In other words, don't touch the wire, it could be hot, electrically as well as temperature wise. Otherwise it is a good tool for the job.
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