Re: [TCML] Secondary form material

[Finn Hammer <f-h@xxxx>]

Andrew Robinson skrev:
> As many have already discovered, PVC is apparently a terrible material 
> to use as a secondary coil form. About a week ago my engineering group 
> also discovered that acrylic is extremely hard to work with. We ended 
> up cracking our only secondary coil form which we slaved over to find! 
> So my question to everyone out there is what on earth should we use 
> for the secondary coil form. We need a 4" OD coil form and if 
> possible, if you can name a material that can also be an 1/8" thick we 
> have a nice cutting tool that makes the most perfect end caps. So 
> ideally 4" OD and 3.75" ID is perfect for what we need. I've called 
> numerous plumbing companies with no help what so ever. Thanks everyone!
>
> Regards,
> Andrew Robinson
Andrew,

In the old days of Richard Quick and other early pioneers, what today 
would look like unnecessary precautions, were made, when selecting and 
preparing coil forms.
It was recommended that you dry the tube for days in specially made 
chambers, that you coat it several times with varnish before winding 
etc. etc.

Thankfully these early pioneers were over cautious or perhaps they 
scrounged the sewer pipe right out of the trench, recycling it after 
several years of it´s intended use.

Who knows, anymore.

But today, with contemporary materials, new from the store, you can 
start winding on a pvc tube without any preparation except a wipe with a 
cloth.
Doesn´t hurt with a bit of alcohol on that cloth either....

This is how I have done it over the years, and I have had no problems 
that I could blame on the material.
(But several problems that I could blame on myself)

PVC is the choice of champions!

Cheers, Finn Hammer
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