HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Nov 12, 2012, 01:24 AM
Registered User
Artful Owl's Avatar
New Zealand, Canterbury, Christchurch
Joined Dec 2011
548 Posts
Question
Witch Toroidal Transformer (Hotwire Foam Cutter)

Hi all I am in the process of building a hotwire foam cutter. I have two Toroidal transformers and I don't know what one to use. One is 50V 3.0A and the other is
55V 1.45A. Witch one will be powerful enough to power a welding wire at 1800mm long? I'm using a light dimmer switch to control the heat. Not to sure of the resistance of the welding wire. One more thing at what Volts/Amps dose electricity become dangeris or deadly? I really fear electric shock and am always very careful. Thankyou.
Artful Owl is offline Find More Posts by Artful Owl
RCG Plus Member
Sign up now
to remove ads between posts
Old Nov 12, 2012, 02:24 AM
Registered User
Staffs, UK
Joined Nov 2003
10,551 Posts
Neither are ideal because most "welding wire" is fairly low resistance so needs quite high current at low voltage to get it hot. You might get away with the 3A one but I think you'll need more current (or different wire).

Most of the discussion about powering hot wire cutters is in the Foamies (Scratchbuilt) forum. E.g. http://www.rcgroups.com/forums/showthread.php?t=1725654

Steve
slipstick is offline Find More Posts by slipstick
Reply With Quote
Old Nov 12, 2012, 02:47 AM
Registered User
Artful Owl's Avatar
New Zealand, Canterbury, Christchurch
Joined Dec 2011
548 Posts
thanks steve
Artful Owl is offline Find More Posts by Artful Owl
RCG Plus Member
Old Nov 13, 2012, 01:02 AM
Registered User
Artful Owl's Avatar
New Zealand, Canterbury, Christchurch
Joined Dec 2011
548 Posts
Hi all

Another question. Can a Toroidal transformer be wired in parallel?
Artful Owl is offline Find More Posts by Artful Owl
RCG Plus Member
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Build Log Rob's CNC Hotwire foam cutter robe_uk CAD/CAM 11 Aug 30, 2012 06:21 PM
For Sale 12v 32a powersupply w/free hotwire foam cutter eyeofinsanity Aircraft - General - Miscellaneous (FS/W) 3 Apr 20, 2012 09:03 PM
Question Foam cutter/ hotwire cutter Nīmā The Builders Workshop 7 Jun 26, 2010 06:42 PM
Article Hotwire Foam Factory's 24"-48" Hotwire Bow Cutter, Hot Knife & Plane Build Review 78dave Flight Accessories 20 Nov 02, 2009 04:13 PM