I use a transformer for cutting and haven't shocked myself yet. I touch the wire often on my CNC machine to clean it...I use a socket light dimmer that I got from home depot and plug the transformer into that. So I'm varying the primary side of the transformer...which in turn varies the secondary side. The transformer I have has a secondary tap that I use for small bows and I use the full 24v for larger bows.
It works well and is pretty cheap :) Even though this shouldn't shock you it's still not a good idea to grab the wire...if you're cleaning it with steel wool put something between you and the steel wool...like a plastic bag or something nonconductive. Jared -----Original Message----- From: Andrew E. Mileski [mailto:[EMAIL PROTECTED] Sent: Tuesday, May 11, 2004 2:35 PM To: RCSE Subject: Re: [RCSE] foam cutter DC vs AC Oscar Taboada wrote: > > I am preparing myself to cut foam wings, I have read on some articles that > it could be dangerous to use AC and a dimmer to regulate current and > heat... it also says that it could be so dangerous to use a 12 V car > battery. but such articles doesn't explain why. Use a transformer to provide isolation from the mains, and to work with a lower voltage. Here's a wiring example: http://www.charlesriverrc.org/articles/tools/joedydruliafoamcutterps.htm Make sure the dimmer can handle inductive loads (motors, like fans). Don't forget a fuse! A car battery can provide an awful lot of current when shorted, so a fuse is necessary. To adjust the temperature, you need a variable load resistor, which gets very hot. Make sure not to let the voltage on the battery drop too low (keeping it on charge works). It is possible to use an automotive lead-acid charger in start/manual mode with a light dimmer powering it. Though this won't work with all chargers and dimmers. -- Andrew E. Mileski RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
