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General control line discussion => Open Forum => Topic started by: James Mills on May 27, 2006, 09:36:48 PM

Title: Cutting foam wings
Post by: James Mills on May 27, 2006, 09:36:48 PM

I was watching part of Bob Hunts balsa moulding video and was curious where to purchase the "cutter" or how to make the tool?

Thanks,

James

Title: Re: Cutting foam wings
Post by: RC Storick on May 27, 2006, 09:38:53 PM

I bought a Bow form a company I found on line. Do a search for foam cutting equipment.

Title: Re: Cutting foam wings
Post by: Dennis Pedersen on May 28, 2006, 08:08:26 AM

http://www.tekoa.com/default.asp  This is great stuff .Go for the gravity feed system with a 28" and a 40" bow .You will be very happy.

Title: Re: Cutting foam wings
Post by: RC Storick on May 28, 2006, 08:36:33 AM

Quote from: Dennis P on May 28, 2006, 08:08:26 AM

http://www.tekoa.com/default.asp  This is great stuff .Go for the gravity feed system with a 28" and a 40" bow .You will be very happy.

Thats it! Thats where I bought my setup.

Title: Re: Cutting foam wings
Post by: captcurt on May 28, 2006, 12:01:03 PM

My bow is a 4" x 5" bar made from two sides of 1/4" luan ply with solid ends and spacers so it is about 1-1/8" thick.  Has lightening holes like Hunt's.  The ends are 3/16" music wire rod set at an angle so the wire is put on in tension like an archery bow.

I use a 24V-5 Amp utility  bench power supply and use the constant current mode.

Wire is .020" stainless safety wire--dont use nichrome--it stretches when hot.

I'll post a pix later.  The bow is suspended over the flat table by a pulley and weight system so it is neutra and will stay in any position.

I use another smaller bow to cut the blanks with a set of vertical guides with metal ruler edges.

One of the secrets is to make the templates VERY smooth.  I sand and then polish mine and apply a litle parafin prior to cutting.  Any roughness causes the wire to hang-up and makes ruts in the core.

Curt

Title: Re: Cutting foam wings
Post by: Thomas Wilk on May 29, 2006, 02:35:18 PM

check out these magazine articles

Foam Core Cutter   Shop Tools & Aids   1970 AAM Jul p38   Nall, Joe
Foam Core Cutter *  1977 RCM Sep p63
Foam Cores cutter * 1976 RCM Mar p31
Foam Cutter * 1974 RCM Feb p34
Foam Cutter & Voltage Control * 1976 RCM Nov p80
Foam Techniques  Part 1 * 1972 RCM Apr p55   
Foam Techniques  Part 2 * 1972 RCM Apr p55
Foam Techniques  Part 3 * 1972 RCM Apr p55   

old magazine plans on CD
tawilk36@cpinternet.com
www.cpinternet.com/~tawilk36