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Thread: Lead smear on block

  1. #21
    Boolit Master 243winxb's Avatar
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    Tiny gas bubbles are called porosities, but larger gas bubbles are called blowholes[14] or blisters. Such defects can be caused by air entrained in the melt, steam or smoke from the casting sand, or other gasses from the melt or mold. (Vacuum holes caused by metal shrinkage (see above) may also be loosely referred to as 'blowholes'). Proper foundry practices, including melt preparation and mold design, can reduce the occurrence of these defects. Because they are often surrounded by a skin of sound metal, blowholes may be difficult to detect, requiring harmonic, ultrasonic, magnetic, or X-ray (i.e., industrial CT scanning) analysis. https://en.m.wikipedia.org/wiki/Casting_defect

  2. #22
    Boolit Master
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    If you want blowholes ,buy a Chinese machine tool........sometimes quite important areas of iron turn out to be thick filler in blowholes......the China iron also tends to be so porous that it disappears if you try to fill it with any arc weld......Best cast iron you will ever see is old diesel engine flywheels......Ive made a few molds from biggies.

  3. #23
    Boolit Master



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    I'll try casting some boolits tomorrow AM & see what's los - thank you all for your advice...
    Echo
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    One of the most endearing sights in the world is the vision of a naked good-looking woman leaving the bedroom to make breakfast. Bolivar Shagnasty (I believe that Lazarus Long also said it, but I can't find any record of it.)

  4. #24
    Boolit Master



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    Well, I cast some - the ones from the OK cavity turned out OK (not great - needed more heat), but the ones from the repaired cavity, not so much. Good (?) bullet in front, others behind. And had to beat the **** out of the mould to get the front cavity to release. I will gladly GIVE this mould to anyone who would like to play with it. You pay shipping, is all.Click image for larger version. 

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    Echo
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    One of the most endearing sights in the world is the vision of a naked good-looking woman leaving the bedroom to make breakfast. Bolivar Shagnasty (I believe that Lazarus Long also said it, but I can't find any record of it.)

  5. #25
    Boolit Grand Master Bazoo's Avatar
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    Id like to have it. I love a new challenge, and If all else fails, could use it to practice HPing a mould before I try it on a better one.

  6. #26
    Boolit Grand Master In Remembrance
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    Let us know your progress / results please? Interesting - Never seen a repaired mold since I only bought new, till recently.

  7. #27
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    Quote Originally Posted by Echo View Post
    Well, I cast some - the ones from the OK cavity turned out OK (not great - needed more heat), but the ones from the repaired cavity, not so much. Good (?) bullet in front, others behind. And had to beat the **** out of the mould to get the front cavity to release. I will gladly GIVE this mould to anyone who would like to play with it. You pay shipping, is all.Click image for larger version. 

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    Thank you very much for starting this thread Echo. My question is , what does the other half of the mold look like? Is it the same as the side you posted the pic of? Did the person selling this mold show the inside of the mold halves? Just being curious here, nothing else. In all the years I've been here on Castboolits, I don't think I've seen a mold pic like this one. Hope you have good luck with this one Bazoo.
    Enewetak Atomic Clean Up Veteran 1979

  8. #28
    Boolit Grand Master In Remembrance
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    Eezox and a razor blade
    Regards
    John

  9. #29
    Boolit Grand Master Bazoo's Avatar
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    I will report back if I make any progress on it. From the castings, i'd say there is some raised metal on the repair that might be all I have to do is somehow remove it. It'll be a learning experience for sure.

  10. #30
    Boolit Master Drew P's Avatar
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    Surprised nobody suggested bees wax. Seems to creep under and scrape off with wood after warmed up.

  11. #31
    Boolit Master



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    Quote Originally Posted by 472x1B/A View Post
    Thank you very much for starting this thread Echo. My question is , what does the other half of the mold look like? Is it the same as the side you posted the pic of? Did the person selling this mold show the inside of the mold halves? Just being curious here, nothing else. In all the years I've been here on Castboolits, I don't think I've seen a mold pic like this one. Hope you have good luck with this one Bazoo.
    The other half is the same! I hadn't noticed (Duh!), but samo samo. I'm sending it to Bazoo for him to play with...
    Echo
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    One of the most endearing sights in the world is the vision of a naked good-looking woman leaving the bedroom to make breakfast. Bolivar Shagnasty (I believe that Lazarus Long also said it, but I can't find any record of it.)

  12. #32
    Boolit Grand Master Bazoo's Avatar
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    I started a new thread about this mould. Here http://castboolits.gunloads.com/show...d-mould-repair

  13. #33
    Boolit Master gnostic's Avatar
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    I'd try lead wipe away cloth like I use on my stainless handguns, it works well on them.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check