Recent content by GreenTwin

If my doctors knew what I did, they would have a hernia, and so I never give them the slightest hint about foundry work, motocross, water skiing, windsurfing, jet ski, parasailing, ultralight flying, rock climbing, mountain hiking, kayaking, or many other things I do, or use to do. .

There are a lot of words that cannot be used these days, but we won't go there. I was at a wedding reception a few years ago, and mentioned a few things that it seemed safe to mention; all harmless conversation, but with a bit of political slant. It was the proverbial thing dropped into the...

I use an automotive brake cylinder hone, with oil, mounted on a drill, or mounted in the lathe, but you have to be extremely careful not to let the stones get too far out of the cylinder, else they crash, and the stones are destroyed. You can set the carriage stops on the lathe to control the...

Nice work on the link. .

Beautiful casting work ! Most impressive. .

I just found this channel. Most interesting. I wonder if he tempers to T6 ? https://www.youtube.com/watch?v=oaXXVJdU6Vg

An interesting die-cast racing cylinder video (not lost foam, but never the less quite interesting).

The large cylinder looks really nice, but there are some horizontal lines visible inside the bore, and for a motorcycle cylinder, you could not afford to have a cold shunt. I would like to the the cyinder sectioned. Kelly has definitely taken the hobby lost foam process to a whole new level...

I looked at a commercial lost foam casting process, and it appears that there is fairly large funnel-shaped sprue at the top, and once that piece flairs/burns, then there is no gassing out the sprue after that. Looking at Kelly's video at 9:46, it seems like a similar thing is happening, ie...

The hobby style lost-foam process uses hardware store foam, which is not the same as the expanded bead foam (I don't think they are the same). I have a few photos of xrays of high quality commercial aluminum castings, and they are indeed flawless inside and out. Too bad this method is not...

This is a great idea, I think. .

There apparently is a lot more to the igniter than meets the eye. .

I saw that. Very clever indeed. We must build one. .

The mother of all threads for sure. .

Yes, I have only heard of one hobby casting person try the 3D printing wax, and he basically said it has a lot of problems, but I don't know the specifics. And this was about 4 years ago, so things may have developed since then. That is one impressive digger bucket right there ! I will follow...