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  #21  
Old 02-17-2013
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Re: casting Bronze porthole rings

When I first read your post, I thought "you've got to be kidding- no way this is going to happen". However, after seeing your project on the welding forum, you have my respect- I'll bet you can do it. Best of luck with your project.
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  #22  
Old 02-18-2013
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Re: casting Bronze porthole rings

Quote:
Originally Posted by msmith10 View Post
When I first read your post, I thought "you've got to be kidding- no way this is going to happen". However, after seeing your project on the welding forum, you have my respect- I'll bet you can do it. Best of luck with your project.
thanks.
Im just plodding along since 2009-2010 or so. Some days is hard some is easy but still dreaming every day about sailing to sandwich islands where the girls are pretty and the sandwiches are free :-)

ze
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  #23  
Old 02-18-2013
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Re: casting Bronze porthole rings

I will try and take some pictures later of forms and core boxs BUT you need to spend some time on a foundry fourm and learn a bit more about shrink factors and core boxs

If your going to win at this you need to gain a better understanding of how a sand casting mold is made
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  #24  
Old 03-16-2013
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Re: casting Bronze porthole rings

been busy making porthole. Since the lathe is only 11'. and the outer rim of the portlight is close to 30cm. A little hard to shape.

http://weldingweb.com/attachment.php?attachmentid=346531&stc=1&d=1363331755



Last edited by zeyang; 03-16-2013 at 04:04 AM.
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  #25  
Old 03-16-2013
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Re: casting Bronze porthole rings

Just out of curiosity - since you are that equipped and skilled, why are you sand casting and machining all of them? Why didn't you machine a single steel die and get nearly finished cast parts instead?
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Old 03-16-2013
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Re: casting Bronze porthole rings

When I was building my Adirondack Guideboat, was going to try casting my own oarlocks but found a company in Maine that makes cast stuff. It may be worth it to give them a shout: Marine Hardware, Oarlocks - Shaw & Tenney

Your project is awesome. Best of luck with her!
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Old 03-16-2013
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Re: casting Bronze porthole rings

Quote:
Originally Posted by WDS123 View Post
Don't try this at home.

We used to have a foundry way back when - serious know how required.
Ditto on that.
Bronze casting is an 'acquired art' with a high learning curve, so do expect a lot of your castings will result in 'sponge'.
Suggest you seek out bronze formularies that include some zinc and lead added to the melt mix --- for easy 'machineability' and which are more easily 'spot repaired' by gas welding to correct the inevitable 'gas blow out holes' and 'laps'.

Obviously you dont want zinc in the 'mix' for any 'underwater' bronze service.
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Old 03-16-2013
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Re: casting Bronze porthole rings

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Originally Posted by SloopJonB View Post
Just out of curiosity - since you are that equipped and skilled, why are you sand casting and machining all of them? Why didn't you machine a single steel die and get nearly finished cast parts instead?
Hi,
Alloy is melting at 800 degrees C, cast iron you have to add 400-500 degrees. which i dont have equipment for (im using a tempering oven to melt at the moment)
Ive been thinking about using a die.if i plan to make 100 i would probably have gone down that road, but since i only need 20 its easier to use sand and a core and machine them.

i could probably buy this cheaper from china, than make them myself.
Reason i do this is:
1. i have lots of scrap alloy from the boatbuilding.
2 I need the foundry skills for all small bits and pieces on the boat which will be made later and i need to get better at machining than Im today. (i regret i never learned this in school)
3. it gives a good feeling melting alloy. and shape it into all kinds of stuff. Not just weld tbars and plates together.
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  #29  
Old 03-16-2013
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Re: casting Bronze porthole rings

I'm intrigued. I've toyed with the idea of a backyard bronze foundry. Since it was done just after the stone age it can't be that hard right?

I've got 10 chainplates that need replacing and more fittings that it wouldn't hurt to replace. Heck, if I could cast in sand I'd be making bronze cleats and all sorts of stuff...

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  #30  
Old 03-17-2013
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Re: casting Bronze porthole rings

i dont find it hard to cast. at least alloy. its just time consuming. i spent a week making one and im not finished yet.
i fake the quality by maching it smooth. if im getting good at casting then its no need for machining the parts.

ze
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