jim532
Postman
- Joined
- Jul 14, 2013
- Messages
- 84
*Goes off to look at the price of brass bar*
I rarely use brass. When I do I source lead free brass.
Most are unaware that the vast majority of mass produced (CNCd) brass parts (screws, nuts, bolts ect) are made of CZ121 brass (free machining brass). The reason that grade is used is because its easier to machine due to its 3% (or more) lead content. The vast majority of brass on the market is CZ121. Check it out
http://www.tatasteelnz.com/downloads/Brass_Alloy385.pdf
http://www.ebay.co.uk/sch/i.html?_sop=15&_sacat=0&_from=R40&_nkw=cz121&_ipg=200&rt=nc
Will that lead in the screws ect in your atty do you any harm? That's a question that I am unable to answer. I personally have no concerns about it. But many are sceptical, hence the reason why I don't use it. If peeps want to fit brass screws to my attys its their own choice. I supply them with stainless screws fitted (sometimes Gold plated).
Someone did request that I machine them an atty in copper. No doubt it would look cool. But the problem with copper is its very soft. That's why they add zinc & call it brass. Then add the lead for faster mass production. Does anyone know the content of the brass used in the attys that are mass produced in China? Although they may look like steel, many are brass which has nickel plating to make it nice & shiny. I have modded several of those attys. The lathe ends up covered in a yellow powder. I find the metal very soft & easy to machine, much easier than Aluminium. Since I find the metal to be much softer than any other brass I have machined, I often wonder re the metal's content. I had never before machined brass that disintegrates into powder as soon as the cutting tool contacts it. Since there is no way that the manufacturers will tell me it's content, & there is no way that I would pay to have it analysed, it will remain a mystery to me.
So the best solution for a copper atty is to machine it in stainless then plate it in copper. I have had some copper plating solution sitting on a shelf for about 3yrs. The bottle has never been opened.
However, at some point I will machine some copper drip tips. Yes I will post the pics & send one to Todd for the usual nitpicking
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