Re: Bought a sinker mold. Sinkers are ugly
[Re: Mark K]
#6591397
08/09/19 03:56 PM
08/09/19 03:56 PM
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Joined: Dec 2010
Posts: 34,914 Central, SD
Law Dog
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Posts: 34,914
Central, SD
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Maybe try heating the mold a bit if the lead is cooling to fast?
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Jerry Herbst
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Re: Bought a sinker mold. Sinkers are ugly
[Re: Mark K]
#6591404
08/09/19 04:02 PM
08/09/19 04:02 PM
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Joined: Jan 2018
Posts: 302 Wyoming
Hobbs
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Joined: Jan 2018
Posts: 302
Wyoming
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Law Dog is spot on. You need to heat the mold to get good casts, if not you will be cooling as you pour. You can either take a torch and pass it over the mold or ( and this is what I prefer to do) make several pours in rapid succession. So I pour a set of sinkers, pop them out and put them right back into the melting pot, then pour another set of sinkers and repeat until the molds start coming out clean. It should take a few seconds before the sinkers start to cool in the pour hole.
Last edited by Hobbs; 08/09/19 04:02 PM.
It's a trappers life for me
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Re: Bought a sinker mold. Sinkers are ugly
[Re: Mark K]
#6591405
08/09/19 04:03 PM
08/09/19 04:03 PM
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Joined: May 2010
Posts: 28,978 potter co. p.a.
pcr2
"Twerker"
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"Twerker"
Joined: May 2010
Posts: 28,978
potter co. p.a.
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most home made sinkers i've used have been ugly but worked great.i did run the last batch i had through a small rock tumbler that made em look a little better but no difference in effectiveness.
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Re: Bought a sinker mold. Sinkers are ugly
[Re: Mark K]
#6591435
08/09/19 05:16 PM
08/09/19 05:16 PM
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Joined: Dec 2006
Posts: 21,049 St. Louis Co, Mo
BigBob
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You can also dip the mold corner in the pot for a minute to heat it up. But, the ugly ones sink just as fast as the pretty ones.
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Remember Bowe Bergdahl, the traitor.
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Re: Bought a sinker mold. Sinkers are ugly
[Re: Mark K]
#6591460
08/09/19 05:44 PM
08/09/19 05:44 PM
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Joined: Sep 2013
Posts: 18,615 Green County Wisconsin
GREENCOUNTYPETE
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Green County Wisconsin
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if they are wrinkly your not hot enough
the mold needs to be hot , dip a corner in the melted lead hold it there , I use 2 stroke motor oil on my mold pins with a qtip and on my sprue plate sprue plates are more of a bullet mold thing than a sinker mold the oil should just let a little whisp of smoke off when you are getting into the right temp
use a candle to smoke the cavities if they don't drop well
but hot mold hot lead , the puddle out side the mold cavity should stay molten for 7- 10 seconds after you quit pouring before it freezes
wrinkels are the leaf freezing as it hits the mold .
when I am casting bullets especially big 300+gr bullets I run that pot hot and dump bullets till they fill out with crisp edges in the driving bands then back off when they start sticking or get a frost to them I want to run the pot just below frosty bullets , the frost is the antimony cristalizing because it is too hot but I find that by getting a few frosty bullets then backing off the heat a but. lightly frosty bullets still shoot fine.
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Re: Bought a sinker mold. Sinkers are ugly
[Re: BigBob]
#6591516
08/09/19 06:51 PM
08/09/19 06:51 PM
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Joined: Apr 2010
Posts: 1,071 South Central Wisconsin
Nelly
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South Central Wisconsin
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You can also dip the mold corner in the pot for a minute to heat it up. But, the ugly ones sink just as fast as the pretty ones. Especially true of aluminum molds. The heat distributes fairly quickly but it also dissipates quickly. Most of the casting that I have done were bullets ,but if you can cast a fairly rapid pace you should be able to get some to fill out well. I became concerned when they started to come out frosty looking but that should be less of a concern with something like a sinker.
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Re: Bought a sinker mold. Sinkers are ugly
[Re: Mark K]
#6591519
08/09/19 06:59 PM
08/09/19 06:59 PM
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Joined: Nov 2013
Posts: 1,020 ohio
jctunnelrat
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The above comments are a great wealth of info. Heat the mold over the smelting pot. Make sure there is no corrosion inside the mold. When the mold is polished to a mirror finish hold over a candle to "soot" the mold cavity. Pour a few castings and return them into the smelting pot. Keep doing that until you get the casting finish you're looking for. If still having problems try fluxing the lead. (candle wax works good as a flux, throw a chunk in the pot, stir it around after the flame goes out ladle the slag off the top ). The impurity of the lead can cause problems. Good luck.
jim
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Re: Bought a sinker mold. Sinkers are ugly
[Re: Mark K]
#6591522
08/09/19 07:01 PM
08/09/19 07:01 PM
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Joined: Aug 2008
Posts: 16,275 ny
upstateNY
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ny
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What brand of mold and what sinkers are you pouring?I pour all my own sinkers along with all my own jigs.Also worked in a foundry for a couple years so I know a bit about molds and pouring metals.
the wheels of the gods turn very slowly
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Re: Bought a sinker mold. Sinkers are ugly
[Re: GREENCOUNTYPETE]
#6591541
08/09/19 07:14 PM
08/09/19 07:14 PM
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Joined: Sep 2013
Posts: 10,404 Northeast Oklahoma
Mike in A-town
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Posts: 10,404
Northeast Oklahoma
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if they are wrinkly your not hot enough
the mold needs to be hot , dip a corner in the melted lead hold it there , I use 2 stroke motor oil on my mold pins with a qtip and on my sprue plate sprue plates are more of a bullet mold thing than a sinker mold the oil should just let a little whisp of smoke off when you are getting into the right temp
use a candle to smoke the cavities if they don't drop well
but hot mold hot lead , the puddle out side the mold cavity should stay molten for 7- 10 seconds after you quit pouring before it freezes
wrinkels are the leaf freezing as it hits the mold .
when I am casting bullets especially big 300+gr bullets I run that pot hot and dump bullets till they fill out with crisp edges in the driving bands then back off when they start sticking or get a frost to them I want to run the pot just below frosty bullets , the frost is the antimony cristalizing because it is too hot but I find that by getting a few frosty bullets then backing off the heat a but. lightly frosty bullets still shoot fine. Frosted bullets... They're grrrreeeaaattt. Mike
One man with a gun may control 100 others who have none.
Vladimir Lenin
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Re: Bought a sinker mold. Sinkers are ugly
[Re: Mark K]
#6591551
08/09/19 07:22 PM
08/09/19 07:22 PM
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Joined: Feb 2019
Posts: 1,553 Saucier, Mississippi Harrison ...
turkn8rtrapper
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Saucier, Mississippi Harrison ...
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I always pour the mold once and let it sit a few minutes then empty the mold put those back in the melting pot when ready start pouring. I try to not let it take me long as a warm/hot mold and properly heated lead is key.
"Skin that smokewagon and see what happens"
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Re: Bought a sinker mold. Sinkers are ugly
[Re: Mark K]
#6591984
08/10/19 01:05 PM
08/10/19 01:05 PM
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Joined: Aug 2008
Posts: 16,275 ny
upstateNY
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What brand of mold and what sinkers are you pouring?I pour all my own sinkers along with all my own jigs.Also worked in a foundry for a couple years so I know a bit about molds and pouring metals. The melting pot is a Lee Infinate Heat Control pot. I have that mold and use it all the time.As stated above,,the mold has to be hot.I pour the mold,let it sit a minuite,then try again.Repeat again if you have to.Also,,you need a good side cutter to cut the waste from the sinkers.With that mold,,they will NOT come out as pretty as store bought ,,but will be perfectly functional.
the wheels of the gods turn very slowly
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Re: Bought a sinker mold. Sinkers are ugly
[Re: Mark K]
#6591989
08/10/19 01:19 PM
08/10/19 01:19 PM
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Joined: Dec 2006
Posts: 20,079 SEPA
Lugnut
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I used to cast lead battery cable ends for a living. We did three things to make nice smooth, shiny castings.
1. Preheat the mold with an acetylene torch .
2.Put black smoke on the faces of the mold. This was also done with an acetylene torch. We did it even when the mold was hot.
3. Dust the inside of the mold with baby powder. We'd dump the talc powder into a rag and tie it shut so it was about baseball size. Then every so often beat it oin the face or pour gate to powder up the mold.
Eh...wot?
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Re: Bought a sinker mold. Sinkers are ugly
[Re: Mark K]
#6591999
08/10/19 01:51 PM
08/10/19 01:51 PM
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Joined: Dec 2009
Posts: 188 mt
insanelupus
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Joined: Dec 2009
Posts: 188
mt
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What is your lead source? Most clip on wheel weights are zinc nowadays. It is possible to cast zinc contaminated lead, they ain't purty, but they will make useable sinkers. Bullets though, not so much.
"My feeling is this, give him plenty of time, plenty of birds, and a little direction, and he'll hunt his heart out for me. That's all I ask."
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