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Thread: Flash

  1. #1
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    Default Flash


    Been pouring some 1/32 & 1/16 jigs lately and I’m developing flash on every one. Tried to turn down the heat on my pot but it’s not helping. Looking at my mold in the light I can see daylight in the middle. Tried taking a stone to it to knock down any high spots. No luck. What can I do? Thanks.

  2. #2
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    Maybe try a brass brush to get any lead pieces stuck to the face that you don't see. Lay it on something flat to see if its warped. You can also try a clamp. If none of those help, time for a new one.

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    If it is warped you can take it to a machine shop and have it professionally checked and straightened. Now your your mold is getting pricey. Plus you may have to modify the hook cavity. Either way, have it at least checked.

  4. #4
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    Open it up, look really close to entire face of mold and in the area where it hinges. You are looking for a tiny spot of led splatter that has been flattened and really blends with color of mold. I have this happen every once in awhile. Amazing a thousands or can cause a pretty good gap.
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    A trick we used to use on motorcycle casings was to take a good sized piece of glass and put a piece of 400 grit wet or dry sandpaper on it. Put the casing, or in your case the mold, on it and move it a couple of times and look at it. It will show high spots first. I wouldn’t remove much without warming it up and pouring it. You might even see the daylight you can see between the halves go away. Stopped a couple of oil leaks on an old Triumph I had. You might have to remove the handles to do this.
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    What skeetbum is talking about is very similar to what a machine shop will do but with a lot less expense.
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    what skeetbum is describing is called surface lapping. wet your 400 grit with a little bit of mineral spirit so it doesn't remove too much material. lap in a figure 8 direction to make sure you dont create an uneven surface. do not true the mold with an end mill or you will end up removing too much material and ruin the mold

    pappa
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  8. #8
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    Great advice from pappa, might even use 500 or 600 to remove as little as possible without marking surface.

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    Try the next size down smaller hook and see if that makes a difference.
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