In this space, visitors are invited to post any comments, questions, or skeptical observations about Philo T. Farnsworth's contributions to the field of Nuclear Fusion research.
Subject: Re: Spot Welder
Date: Jun 07, 0:37 am
Poster: Richard Hester
On Jun 07, 0:37 am, Richard Hester wrote:
People might also look out for dental spot welders. I bought one a couple of weeks ago, and intend to use it to fashion my first stainless steel grids. If it doesn't have enough oomph for tantalum, well, I have a couple of huge steel tape cores lying about about that would be a nice basis for a pulse welder, with persuasion from an SCR, ignitron, or maybe a mercury displacement relay.
BTW, mercury displacement relays of very respectable capacity can be had on the surplus market for a very reasonable price. I suspect that the models with steel capsules (not glass!) would soak up alot of abuse.
>I was finishing up at the fest on Sunday and on my way back to the truck, saw a pile of things in the grass with the scribbled sign "FREE STUPH". In that pile was a somewhat battered Raytheon tube element production spot welder! It weighs about 120 lbs, and I chugged it out to the truck on my dolly. It is vacuum tube based, but has several ranges of weld discharge capacitance selectable on the front dial. It looks like late 50s early 60s technology, but at free, it was priced right and I will be cleaning and servicing it back to life. I will, hopefully, have a nice professional spot welder made specifically for small tube element assembly.
>It pays to pay attention to even hamfest junk piles!