[NSRCA-discussion] Foam cutter power supply

[Tony]

There is also schematics for one of these on the NSRCA website..by Tom
Wheedon.

 

Tony Stillman, President

Radio South, Inc.

139 Altama Connector, Box 322

Brunswick, GA  31525

1-800-962-7802

www.radiosouthrc.com

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Steven
Maxwell
Sent: Thursday, May 21, 2009 11:49 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Foam cutter power supply

 


simple and works.

http://www.charlesriverrc.org/articles/tools/joedydruliafoamcutterps.htm

 

Steve Maxwell

--- On Thu, 5/21/09, J N Hiller <jnhiller at earthlink.net> wrote:


From: J N Hiller <jnhiller at earthlink.net>
Subject: Re: [NSRCA-discussion] Foam cutter power supply
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Date: Thursday, May 21, 2009, 11:40 AM

I remember reading about using two dimmers. I believe the reason for using
two is to get a more sensitive adjustment near the voltage (15) we need. I
have used a single dimmer for mane years, which worked sort of. It wouldn't
turn on below about 25 v but could be adjusted down to 15 without shutting
off. The cure was to load the dimmer with a light bulb connected in series
with the wire and dimmer. A 300 w bulb greatly reduced the sensitivity of
the dimmer. The voltage across the light bulb is around 75 loading the
dimmer to about 3/4 full on for very broad adjustment, 150 probably would
have been enough.

There is a shock (electrocution) hazard using household current. Although I
haven't tested it I have a GFI outlet in my shop that I use. The transformer
based power supplies isolate and separate the household (primary) from the
secondary output voltage eliminating possible contact with household
current. If I didn't already have a usable power source I would just buy one
(plug & play).

Jim Hiller 

 

 

 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Paul LaChance
Sent: Thursday, May 21, 2009 1:26 AM
To: NSRCA Mailing List
Subject: [NSRCA-discussion] Foam cutter power supply

 

Hi all,

 

I was told about a way to make a power supply for a foam cutter using 2
dimmer switches.  I was also told to measure the final voltage to get an
approximate starting point of 15 volts.  I am not getting a voltage change
with the dimmers.  I have tested to see that there is a difference by using
a drill to see that it is reducing the speed.  Does anyone know how I can
measure to get a starting point or is it going to be trial and error?  

 

Thanks in advance,

 

Paul


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