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Old Apr 20, 2001, 10:39 PM
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PunkerTFC's Avatar
Iraq
Joined Feb 2001
840 Posts
How do i make my own hot wire rig?

can someone point me to instructions on how to make my own hot wire rig?
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Old Apr 20, 2001, 11:05 PM
Function Over Form
BillH's Avatar
Connecticut
Joined Feb 2000
1,043 Posts
THe best way to do it is find a Variac, and hook it up to a 12 volt step down transformer. IF you dont use the stepdown, the adjustments will be WAYYYY too sensitive, if your finger slips, the wire will turn bright red and melt. Also the 12 volt stepdown will keep your Variac from frying.
As for the Bow, just design your own design out of PVC or wood, Make sure you can adjust the tension on the wire.
AS for the wire, use Stainless steal fishing leader wire. Its available in tons of thicknesses, and works much better than nichrome wire, despite what people will tell you.

[This message has been edited by BillH (edited 04-20-2001).]
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Old Apr 20, 2001, 11:12 PM
Motors beat engines!
Milwaukee Wisconsin, United States
Joined Feb 2001
4,564 Posts
I've heard you can also just use a model train transformer. I don't know what specs it needs though.

Dean in Milwaukee
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Old Apr 20, 2001, 11:21 PM
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dave morris's Avatar
orlando fl
Joined Oct 2000
5,713 Posts
BillH I am a little fuzzy on the 12v transformer, I use my Variac without one and have no problem (short of electrocution) with the adjustments. I just crank it to about 10-13 volts and cut away. It is a 15 amp unit I got from a surplus store for 125$.
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Old Apr 21, 2001, 12:22 AM
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Ron Cichowski's Avatar
Carver, MA USA
Joined Jun 2000
553 Posts
http://www.charlesriverrc.org/articles_foam_vac.htm

This link should give you some ideas.
Ron
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Old Apr 21, 2001, 12:41 AM
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Adam Neat's Avatar
Winchester; Ohio
Joined Feb 2001
876 Posts
I use a 24 volt 3 amp transformer and the stainless wire. Nothing else but an inline fuse and it works great. Your cutting wire must be kept around 35 to 40 inches.
Adam
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Old Apr 21, 2001, 09:32 AM
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Martin Irvine's Avatar
Canada, ON, Kingston
Joined Aug 2000
2,016 Posts
I'm using a speed controller and a 12V deep cycle battery _ things I just happen to have around the shop
(I also use a servo driver now but have run it with a receiver and transmitter)
I also am using stainless steel fishing wire for the cutting wire in bows made from 3/4" dowel and 3/16 spring steel. Dead simple and cheap.

cheers,

Martin
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Old Apr 21, 2001, 09:50 AM
Function Over Form
BillH's Avatar
Connecticut
Joined Feb 2000
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Dave, I wish I could tell you why, but my boss who is an Electrical Engineer told me to do so, or I would blow out my variac. I think he mentioned it had something to do with the impedence.
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Old Apr 21, 2001, 10:06 AM
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maciek's Avatar
Worcester, Ma, USA
Joined Feb 2001
277 Posts
I connected two car battery chargers in series, and I adjust temperature by sliding one of the power wires along the nichrome wire (shorter distance between the wires makes the nichrome hotter). It's worked for me really good and all it cost me was a couple $ for the nichrome. I also had to borrow a second charger from a neighbor:-)

<marquee> hope this helps... <marquee>

[This message has been edited by maciek (edited 04-21-2001).]
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Old Apr 21, 2001, 01:23 PM
Function Over Form
BillH's Avatar
Connecticut
Joined Feb 2000
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Why I light dimmer?
DOesnt the Variac have an adjustable wheel you turn?
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Old Apr 21, 2001, 01:50 PM
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Ralph Weaver's Avatar
Indianapolis, IN USA
Joined Nov 2000
2,305 Posts
Quote:
Originally posted by BillH:
Why I light dimmer?
DOesnt the Variac have an adjustable wheel you turn?
The transformer/dimmer is a lot cheaper than a variac.
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Old Apr 21, 2001, 01:59 PM
Function Over Form
BillH's Avatar
Connecticut
Joined Feb 2000
1,043 Posts
ohh ok, makes sense, I thought they were using all three together
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Old Apr 21, 2001, 06:48 PM
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GregG's Avatar
Antioch,CA,USA
Joined Dec 1999
12,311 Posts
We're all flying electric planes, right? All I use is a seven cell battery pack and a homemade bow with .015 music wire. If the wing has too long a length of cut (music wire too long) for the seven cell pack, I use an eight cell pack. It works for a few cuts and then you simply recharge it. Works better if you have a couple of packs. I found a drawing of a bow on a german site.
http://www.jps.net/cobrajet/Foambow4.JPG
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Old Apr 22, 2001, 12:03 AM
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Ralph Weaver's Avatar
Indianapolis, IN USA
Joined Nov 2000
2,305 Posts
I use an Astro charger in "test" mode. You can dial in any current you want.
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Old Apr 22, 2001, 12:54 AM
Registered User
Canada
Joined Nov 2000
7,002 Posts
Aircfraft Spruce and Specialty they have a Webb site.. sell Variacs for $60 and an 'El cheapo' hot wire kit consisting of a largish 24v transformer and a household light dimmer for $18.
Laughably simple, easily home duplicatable.. and it really works, especially using "Controline" stainless wire, obtainable free from any CL flier.
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