Homebrew PCBs

>> i have this acryl/plexiglas here that gets really soft (like soft 
>> rubber),
>> but it does not fuse with the welding rod of the same material,
>> if i heat more it charrs.
>
> I doubth it's really the same material then.
>
> Markus

Well, it's cut of the same sheet.
it is hard transparent plastic when cold, when hot is flexes like rubber,
you can cut it with a knife over a broad temperature range, but it simply 
didn't
want to join, i heated it until it already started to char and pressed it 
together
hard and it just didn't fuse. (if you cut it with a knife and then heat
up the cut it will not fuse together again.)
i think the problem is it gets so soft. the material just flexes under the 
pressure.

I do not really need to weld this sheet, it may just be a kind very hard 
to weld.


You said you use the shoe sold in the DIY store? (from steinel)
then i will go and get one...

I cut the strips with a table saw (i rebuilt the proxxon saw with the 
burnt-up
12V motor into a good saw, now it has a toothed belt drive and a powerful 
220V motor.
Now it is really useable, as you say, for pcb cutting and such. it laughs 
at 4mm plastic.)
How wide do you cut your strips, square? (e.g. 4x4mm)

ST