flat belt pulley pattern

[dallen]

(09-13-2013, 07:43 PM)Mayhem Wrote: Nice work Dave - I'd be very happy with that and given the age of the machine those few, minor flaws I would imagine it will look the part.

Thanks, its taken me a spell to get here at one point I though I was going to have to re do one side of pattern to get it to release from the mold, but for some reason the foundry gods saw fit to smile on me just once.

the flaws don't look the part as the one that was originally made for the shaper didn't have sand inclusions in it or the end of the hub shrunk in slightly, the shrinkage is machinable. the sand inclusions can be welded up if I was making this to sell. the hot tears the only way to fit them is to recast the part with a larger fillet which will spread the metal out and give a more gentle sweep for the metal to pull over as it cools.

I don't know yet if I will have to re pour this pulley or not (really depends on if I mess up the machine work on it) if i do have to re pour I will put in a larger fillet.

But I think I have it figured out how to get it back in the lathe, first I'm going to try a flap sander wheel to open the thing up one of two thousands thats all I need for it to fit on the input shaft of the shaper.

DA