Post by diverdown1955 on Sept 15, 2005 11:57:33 GMT -8
I wonder how many of us out there have or had boats, and have screwed up their brass props.....I know I got one in the garage that I'd throw into the pot! It could be a source...alot more leisure boaters around than ship yards. A check in with the local boat merchants might get you more brass than you can handle.
PS I also have a Trieste ll single hose that could stand a conversion!
i also agree with seakraaken but i think that this is one thing to be done right
i am not to worried about lead as i shoot and reload ammonuition sometimes'
the whole lead scare sounds even less dangerous than asbestos which only has a notable effect inover a long time especially in mine workerst
"As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron." — H. L. Mencken
Post by hullscrubberfla on Sept 15, 2005 13:44:04 GMT -8
Nowadays, most inboard boat props are made out of Nibral (a nickel, brass, and aluminum alloy) which is considered safe for the enviroment. It's rugged enough for large props and marine tools, so it probably would work fine for casting housings.
Thanks to everyone for all the great comments, good stories and good advice. Although there may not be any health risks with using leaded brass, there seems no point in taking the risk when marine brass and bronze are available. So when I can find the time, I will try to cast some up and see how it goes. Dan
One of the single hose manufacturers (name is apex if I remember correctly..I hate gettin old) makes their 1st stage out of SAE 486 bronze, high strength with 1.25% lead.......there is also the Navy M bronze SAE 622 with mim 1% and max 2%, also called steam bronze, pressure grade up to 550 degrees f. There's also Nicomet Bronze which has .01% max lead........also high strength......
If the valves are plated like the old doublehoses are now and the new single first stages........the lead exposure will be Zero...........
Navy brass is soft......I do not know if it is a good medium for a pressure vessel/valve.
I've priced a 4 inch by 6 inch bar of Navy M Bronze at $184.00 plus frt.............5 or 6 1st stage bodies can be manufactured from that one bar......prices get cheaper with larger quantities......
I'm sorry to say I haven't done any more castings yet. I'm still slowly building and collecting equipment for my own mini-foundry. It looks like the SAE 486 or Navy M Bronze is the way to go. I have some old tank valves that are shot- they might make my first ones. I'm not good at paying new prices- I will try to find scrap bronze. I'm sure chrome plating will eliminate any lead issues. Thanks for all the input! Dan