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JLouis
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Brass Mould Blocks
Apr 25th, 2016 at 7:06pm
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Anyone having trouble getting their grease groove bands to fill out completely with nice sharp edges while using a Brass base pour Mould? 

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oneatatime
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Re: Brass Mould Blocks
Reply #1 - Apr 25th, 2016 at 8:22pm
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No. A fully warm mould, hot lead (~825), full dipper contact for a count to 7, and Bob's your uncle. 360 grain 38 and 400 grain 40 from Bernie Rowles at Old West.
  
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UtahDave
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Re: Brass Mould Blocks
Reply #2 - Apr 25th, 2016 at 9:26pm
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John,

I don't have issues with a brass mold in 25-20 WCF using 20:1 alloy.  It might be more difficult with lower tin levels.  I seem to recall you use 30:1 but I could be mistaken.   

Dave
  
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JLouis
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Re: Brass Mould Blocks
Reply #3 - Apr 25th, 2016 at 9:57pm
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16-1 is my alloy of choice Dave working with some 20-1 right now.

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40_Rod
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Re: Brass Mould Blocks
Reply #4 - Apr 26th, 2016 at 9:16am
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John
Try scrubbing the blocks out with some dish soap and a toothbrush. Really work it into the corners, it may be contaminants.

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JLouis
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Re: Brass Mould Blocks
Reply #5 - Apr 26th, 2016 at 10:07am
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Thanks John I will give it a try!
I have never really had this problem before to this degree and I am about to pull my hair out one strand at a time. I thought I would pose the question here should someone else be having the same problem and the answer to the fix once it is found.

Thanks Again!
JLouis
  
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UtahDave
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Re: Brass Mould Blocks
Reply #6 - Apr 26th, 2016 at 10:26am
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John,

How about a really long shot...are you using any of those vapor rust preventative packets around where you store the molds?  The problem is likely due to organic contamination.  I had problems when I used too much bees wax for flux or was it old lube that didn't work...?  In any case it was a devil to get things clean.  I nearly got to the point of boiling my molds in dishwasher cleaner, the powdered stuff.   

I now cast with charcoal on the lead and periodically stir the melt with a DRY wooden stick.   I don't use wax fluxes, I prefer the dreaded Marvalux.   BTW...don't use charcoal briquettes, they contain a binder called lingosulfonate that is full of sulfur.  Also be mindful of carbon monoxide from the charcoal if casting inside.   

Dave

  
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Schuetzenmiester
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Re: Brass Mould Blocks
Reply #7 - Apr 26th, 2016 at 12:22pm
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When all else fails, smoke it with a wooden match or candle.
  
"some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence
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JLouis
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Re: Brass Mould Blocks
Reply #8 - Apr 26th, 2016 at 12:41pm
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I got it up and going a good cleaning as recommended by John Merz and then I burned / cleaned out the bullet cavity with a Propane Torch. 

Thanks for all of the advice my Friends!

JLouis
  
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