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John Rudd:
I'm interested in the spot welder if you can give some detail please....website link etc...
Will_D:
--- Quote from: John Rudd on December 16, 2014, 02:58:32 PM ---I'm interested in the spot welder if you can give some detail please....website link etc...
--- End quote ---
Hi John,
There are a lot of you tube vids and googlformation. Here is at least an English one (given the accent!)
https://www.youtube.com/watch?v=RnjF5Hj2Udg
Basically remove the secondary and add two turns of the biggest wire you can fit. Mine is 85mm^2 gives 2 volts and more than 800 Amps. For the prototype tips just used some M8 * 0.8mm Mig welder tips. These are as cheap as chips even in Dubland ( €1-20 each) easier than turning down copper bar. I turned them down to about 3mm dia at the ends.
Can only apply force with a pair of pliers (Need to build the arms etc) but as "proof of concept" it works
A small spot welder for under a fiver :clap:
BTW: The 85square was found in ICL's skip in the mid 70's (BIG mainframe computer earth straps)
Should really do a :proj: thread
John Rudd:
--- Quote from: Will_D on December 16, 2014, 04:11:14 PM ---
--- Quote from: John Rudd on December 16, 2014, 02:58:32 PM ---I'm interested in the spot welder if you can give some detail please....website link etc...
--- End quote ---
Hi John,
Basically remove the secondary and add two turns of the biggest wire you can fit. Mine is 85mm^2 gives 2 volts and more than 800 Amps. For the prototype tips just used some M8 * 0.8mm Mig welder tips.
A small spot welder for under a fiver
Should really do a :proj: thread
--- End quote ---
Thanks for the info... :thumbup:
Yup you should do a thread on this.....
John Swift:
Hi Will
I started in the late 60's building projects in Practical Wireless
the PW valve radios powered by a B 136 90V /1.5V battery worked
don't know about any one else who received a Philips EE kit for Christmas but
I had problems with germanium transistor radio circuits in the Philips EE kit
until I replaced the AF116 supplied with an older OC44 :doh:
by 1980 Practical television had published 3 or 4 colour TV projects
Christmas 1981 I built the Forgestone 26" colour TV (and yes It worked first time :D )
Hi John
this may give you some ideas :-
http://makezine.com/2013/11/18/building-a-spot-welder-from-a-transformer/
a few days age I was looking for a DIY transformer kit
for a mains power supply to replace the 90V and 1.5V batteries for a radio
via a page for the maplin millennium valve amplifier I found Danbury electronics make 50 VA & 100VA DIY transformer kits :-
http://livinginthepast-audioweb.co.uk/index.php?p=xfrmrvt227
http://livinginthepast-audioweb.co.uk/index.php?p=xfrmrvt228
the Wire Size Guide could be usefull
John
awemawson:
"I started in the late 60's building projects in Practical Wireless "
Oh Gawd now I feel really old! My first project was a crystal set built on the kitchen table using a copper iron heated on the gas stove. 1959 I think :bugeye:
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