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Mar 12, 2003, 05:02 AM
Boo
Boo
Guest

Is constantan resistance wire suitable for hot wire cutting ?


Hi,

Maplins sell a reel of 28 swg Constantan (aprox 55 % Cu, 45% Ni)
resistance wire (approx 4.2 ohm / m) for a fiver which compares favourably
with the 18 os so that SMC were asking for heavyweight laystrate. Has
anyone used this stuff for hot wire cutting of polystyrene foam ? I also
looked at stainless steel fishing trace but the stuff in my local angling
shop is multistrand with the strands only being held together by the plastic
coating, they are not soldered together like laystrate.


Any other suggestions (please include possible suppliers not RS or Farnell)?

Thanks,

--
Boo




Mar 12, 2003, 05:22 AM
Andy Meade
Andy Meade
Guest

Re: Is constantan resistance wire suitable for hot wire cutting ?


My home made version is about 1.2 metres long on an adjustable wooden bow,
and is made from an old electric fire. I unravelled the wire from the
ceramic and that was it. Cost : 0.00
This is powered by 2 off 12v rechargeables (large gel batteries) and cut the
foam just fine.
hope this helps!
AndyM


"Boo" <Boo@spam_me_no_spam.net> wrote in message
news:b4lbie$1m2$1@news6.svr.pol.co.uk...
> Hi,
>
> Maplins sell a reel of 28 swg Constantan (aprox 55 % Cu, 45% Ni)
> resistance wire (approx 4.2 ohm / m) for a fiver which compares favourably
> with the 18 os so that SMC were asking for heavyweight laystrate. Has
> anyone used this stuff for hot wire cutting of polystyrene foam ? I also
> looked at stainless steel fishing trace but the stuff in my local angling
> shop is multistrand with the strands only being held together by the

plastic
> coating, they are not soldered together like laystrate.
>
>
> Any other suggestions (please include possible suppliers not RS or

Farnell)?
>
> Thanks,
>
> --
> Boo
>
>
>
>



Mar 12, 2003, 11:33 AM
steven crook
steven crook
Guest

Re: Is constantan resistance wire suitable for hot wire cutting ?


In article <b4lo0t$cft$1@newsg3.svr.pol.co.uk>, Andy Meade <verty@warp-
core.com> writes
>My home made version is about 1.2 metres long on an adjustable wooden bow,
>and is made from an old electric fire. I unravelled the wire from the
>ceramic and that was it. Cost : 0.00
>This is powered by 2 off 12v rechargeables (large gel batteries) and cut the
>foam just fine.
>hope this helps!
>AndyM
>
>
>"Boo" <Boo@spam_me_no_spam.net> wrote in message
>news:b4lbie$1m2$1@news6.svr.pol.co.uk...
>> Hi,
>>
>> Maplins sell a reel of 28 swg Constantan (aprox 55 % Cu, 45% Ni)
>> resistance wire (approx 4.2 ohm / m) for a fiver which compares favourably
>> with the 18 os so that SMC were asking for heavyweight laystrate. Has
>> anyone used this stuff for hot wire cutting of polystyrene foam ? I also
>> looked at stainless steel fishing trace but the stuff in my local angling
>> shop is multistrand with the strands only being held together by the

>plastic
>> coating, they are not soldered together like laystrate.
>>
>>
>> Any other suggestions (please include possible suppliers not RS or

>Farnell)?
>>
>> Thanks,
>>
>> --
>> Boo
>>
>>

I found the constantin too soft and it would stretch under tension.
Laystrate would shed its solder on the foam core (fine for C/L combat
though - in the days when foam was allowed)

I would go with the electric fire wire but get a new element as a used
one will be dirty and fragile. You can wind on plenty of tension with
this and a 12V battery charger will heat it up OK. Get two elements and
you can unwind one and use the other as a power/heat regulator.

I am going home to work on my CNC wing cutter.... do a search on CNCnet
to find out about the range of designs out there.

Regards,

--
Dr. Steven Crook
Department of Medical Physics and Biomedical Engineering
Salisbury District Hospital phone +44 1722 429120
Salisbury, SP2 8BJ, fax +44 1722 425263
UK
S.Crook@salisburyfes.com www.salisburyfes.com


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