as I work in a Casting House
I thought I would chime in here
the 'webs' on the Casting I believe are from Seams
left in the mold when it is assembled
that is, typically a mold is made from several smaller pieces
so that they are easier to make
and can be removed from the pattern more easily, etc
these pieces are then joined together
to make up the final configuration of the part
seams are left where the pieces are joined together
typically these are smoothed over-
but sometimes left on interior surfaces
where access is difficult
(or places where they won't show, in this case)
NOTE: I work in Investment Casting
(i.e. 'Lost Wax' process) NOT Sand Casting
but the techniques are very similar
AKB
a-Ferrari
'Web' on castinq
- Tom Wilson
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Ok, so Investment means Lost. Sounds like the kind of investing I do!
Actually, this sounds really interesting. What do you do with this casting? What do you make? I picture sparks flying as the steel is poured into the mold. It sounds old fashioned and high tech at the same time. Can you make one off pieces or only large quantities?
Actually, this sounds really interesting. What do you do with this casting? What do you make? I picture sparks flying as the steel is poured into the mold. It sounds old fashioned and high tech at the same time. Can you make one off pieces or only large quantities?
I would assume a brake drum mold be assembled of two halves, which makes me think that the web pattern may have been created by chills, which were used to cool the center of the mold to get the directional solidification to start in the center of the drum and run outwards. Directional solidification will eliminate porosity and distortion. Both strength and dimensional accuracy are important when making brake drums!
Lost wax is perfect for casting one-off near net shape items (no or very little machining needed) of any metal. I made my master's thesis on manufacturing one-off cast iron tools.
Best wishes, Kare
Lost wax is perfect for casting one-off near net shape items (no or very little machining needed) of any metal. I made my master's thesis on manufacturing one-off cast iron tools.
Best wishes, Kare
250 GT 2+2 3197/GT
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Not knowing anything about casting techniques, did the technique of "chills" exist in the 50s?I would assume a brake drum mold be assembled of two halves, which makes me think that the web pattern may have been created by chills, which were used to cool the center of the mold to get the directional solidification to start in the center of the drum and run outwards. Directional solidification will eliminate porosity and distortion. Both strength and dimensional accuracy are important when making brake drums!
Tom
'63 330 America #5053
chilly
'chills' as used in investment casting
are used in sections where the wax is too thick to solidify readily
I was not aware that chills could also be made of (the same) metal
and placed in the mold and then cast around
to allow more even solidification
very interesting
as for the use of chills in the 50's I do not know about that
the photos I have of the Ferrari foundry
do not show the use of chills
but as many aspects of Ferrari's Foundry were proprietary
this may be difficult to ascertain
AKB
aFerrari
are used in sections where the wax is too thick to solidify readily
I was not aware that chills could also be made of (the same) metal
and placed in the mold and then cast around
to allow more even solidification
very interesting
as for the use of chills in the 50's I do not know about that
the photos I have of the Ferrari foundry
do not show the use of chills
but as many aspects of Ferrari's Foundry were proprietary
this may be difficult to ascertain
AKB
aFerrari
Unfortunately those trade secrets affect how much we know about Ferrari's history!the photos I have of the Ferrari foundry
do not show the use of chills
but as many aspects of Ferrari's Foundry were proprietary
this may be difficult to ascertain
I guess the steel liner was cast in place? So if your drum is bad, you have to find another one!? Are these available anywhere? I wonder if Classique is going to remake those?Those drums are alumium with an integrated steel liner, aren't they? I have a German book on foundry techniques. It includes most chill and feeder techinques and was first printed in 1933.
Tom
'63 330 America #5053