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Why filler on cast iron machines?
- Thread starter beeser
- Start date
- Replies 11
- Views 2,444
rke[pler
Diamond
- Joined
- Feb 19, 2002
- Location
- Peralta, NM USA
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.
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.
4GSR
Diamond
- Joined
- Jan 25, 2005
- Location
- Victoria, Texas, USA
Extra coat of Rusteloum primer will smooth out most surface imperfections. 
M.B. Naegle
Diamond
- Joined
- Feb 7, 2011
- Location
- Conroe, TX USA
Smooth surfaces are easier to clean and they tend to look nicer on new equipment.
thermite
Diamond
- Joined
- Sep 21, 2011
thermite
Diamond
- Joined
- Sep 21, 2011
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...
johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
partsproduction
Titanium
- Joined
- Aug 22, 2011
- Location
- Oregon coast
Is there a "before" photo?
johnoder
Diamond
- Joined
- Jul 16, 2004
- Location
- Houston, TX USA
Sure, but not relating to blow hole which was opened during machining to effect repair of busted up cabinet leg
Attachments
partsproduction
Titanium
- Joined
- Aug 22, 2011
- Location
- Oregon coast
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.
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.
DMF_TomB
Diamond
- Joined
- Dec 13, 2008
- Location
- Rochester, NY, USA
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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.
