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scharkalvin

Member Since: January 6, 2010

Country: United States

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Hey Anime and Manga fans, Join me on www.astroboy-online.com

  • OK, I’m guessing Shawn was listening to “Light my Fire” by the Doors.

    OH and PLEASE put the details of Shawn’s hack on line including the hookup with the two or three other boards he used and the source code.

  • Zefram Cochrane’s first attempt at warp drive during his Sparkfun days.

  • No mention of what those extra connectors on the ethernet shield board are for. Schematic shows SPI and TWI labels for them, are they buffered extensions or what?

    Guess I should have watched the video first. Tinker kit? Going to have to google that.
    Hey Robert got thrown out of the studio? I like the look of the factory floor though.

  • HA! Putting EDISON modules on sale on TESLA’s birthday! Bet the old man is rolling over in his grave! I like your sense of humor!

  • The wax casting wasn’t necessary. You could have done the initial print in PLA and then encased that in the plaster investment. The PLA could then be burned out in the same way that the wax was, although a bit higher temperature would have been required (could be done in the same furnace that you melted the aluminum in).

  • I didn’t see any tire tracks on the wall, but I’m sure SOMEONE is going to try using a bicycle on that speed trap!

  • 6MM != 0.25" You’ve used both to describe the bore of the pulley in the parts description. So which is it? I actually have some NEMA-23 motors that have a ¼" dia shaft, so these might be useful.

  • Well, that may be a bit harder to build than Adafruit’s “cupcade” but it sure looks nicer! http://scharkalvin.weebly.com/about-me.html

  • I made my furnace in a flower pot lined with concrete and perllite. The flower pot was stuffed into a large can that once held popcorn. The lid of the furnace was made in the lid of the can lined with a band of metal and has iron wire re-bar inside to help hold it together, again lined with the same concrete refractory. Haven’t yet tried to fire it up, I have a old hair dryer for the blower. I made two crucibles from empty propane torch cylinders (held them under water and opened the valve with a nail to make sure they were empty!) The hole in the bottom of the pot will allow any aluminum that might spill to drain out the bottom of the furnace rather than into the blow hole. Furnace will be run over a pit of dry sand.

  • You can use the same furnace that you melt the aluminum in as a kiln for melting out the PLA. I’m thinking of trying my own foundry work based on the books by Gingery, using his charcoal fired furnace.

    I do see your point about the silicone mold, but now you have two sources of shrinkage to account for when sizing the original!

No public wish lists :(