Why filler on cast iron machines?
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    Default Why filler on cast iron machines?

    Why is there so much filler on cast iron machines? The filler that I'm referring to is the stuff used to smooth out the roughness on castings.

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    Even if you managed to grind everything off you'd have to have some filler for the divots. So there's some happy place where the worst of the cast is ground down (sprues, risers, etc.) and filler is use to smooth the rest.

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    The filler is to compensate for rough casting surface. In the 19th and early 20th century many castings were polished smooth like a mirror. This obviously is too expensive today. Still, some of the filler today is way too thick and of poor quality.

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    Extra coat of Rusteloum primer will smooth out most surface imperfections.

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    Smooth surfaces are easier to clean and they tend to look nicer on new equipment.

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    Quote Originally Posted by beeser View Post
    Why is there so much filler on cast iron machines? The filler that I'm referring to is the stuff used to smooth out the roughness on castings.
    It's used to smooth out the roughness on castings.

    Next question?

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    Quote Originally Posted by 4GSR View Post
    Extra coat of Rusteloum primer will smooth out most surface imperfections.
    Meahhh.. some castings, yah might wanna cut it 50-50 with ping-pong balls...


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    The main reason is that castings are never perfect assuming unmachined surfaces. There are both external and INTERNAL flaws. Dig the blow hole in this Greaves Clusman cabinet leg.

    Would you have the boys just paint over such things?
    Attached Thumbnails Attached Thumbnails dcp_1405.jpg  

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    Dig the blow hole in this Greaves Clusman cabinet leg.
    Is there a "before" photo?

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    Quote Originally Posted by partsproduction View Post
    Is there a "before" photo?

    Sure, but not relating to blow hole which was opened during machining to effect repair of busted up cabinet leg
    Attached Thumbnails Attached Thumbnails dcp_1287.jpg  

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    John my hat's off to you, that looks like a heck of a project.

    My brother had a GK lathe, big old beast. One gear internally was broken before he got it so he worked around a few speeds. Finally he sold it and the new owner enrolled in shop class to make a replacement gear I was told. I wonder how far he went to duplicate it as original.

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    Quote Originally Posted by beeser View Post
    Why is there so much filler on cast iron machines? The filler that I'm referring to is the stuff used to smooth out the roughness on castings.
    .
    .
    when cast iron extra hot it tends to penetrate more the sand mold and leave a rough surface. common to use a thick epoxy type paint to smooth it.


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