Flaminia Convertibile 3C - Page 3 - Alfa Romeo Bulletin Board & Forums
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post #31 of 93 (permalink) Old 09-05-2014, 12:02 AM
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Holy crap! I missed so many good cars on here. Both of your cars - Hubert and Don - look spectacular. The blue/ tan interior combination is stunning and Don's car is spectacular.

What planet was I living the last 2 years?

Mike

[SIZE="1"][COLOR="DimGray"]53 Lancia Appia Berlina
60 Citroen ID
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69 Porsche 911S Targa (Soft Window)
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post #32 of 93 (permalink) Old 09-08-2014, 10:33 AM Thread Starter
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submarines

My foundry manager asked if I would produce submarine models now. The blanks of the mirror base have been made oversize to be able to machine to the correct dimensions. Also tried some grinding to get rid of the orange skin, it will be a difficult job.
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post #33 of 93 (permalink) Old 09-08-2014, 03:53 PM
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My foundry manager asked if I would produce submarine models now. The blanks of the mirror base have been made oversize to be able to machine to the correct dimensions. Also tried some grinding to get rid of the orange skin, it will be a difficult job.
Nice castings. But will chrome not cover the orange skin ?
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post #34 of 93 (permalink) Old 09-08-2014, 04:08 PM
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Nice castings. But will chrome not cover the orange skin ?
The part has to be a polished surface before chrome plating, otherwise any flaws will show in the chrome.

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post #35 of 93 (permalink) Old 09-08-2014, 04:17 PM
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The part has to be a polished surface before chrome plating, otherwise any flaws will show in the chrome.
Right, although I believe that the copper layer serves to cover small flaws in the casting. But Hubert seems to be concerned about the color of the castings.
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post #36 of 93 (permalink) Old 09-08-2014, 04:42 PM
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Right, although I believe that the copper layer serves to cover small flaws in the casting. But Hubert seems to be concerned about the color of the castings.
I think by "Orange skin" he meant orange peel - tghe roughness of the surface that comes from sand casting.

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post #37 of 93 (permalink) Old 09-08-2014, 04:59 PM
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I think by "Orange skin" he meant orange peel - tghe roughness of the surface that comes from sand casting.
Could be. But the copper should take care of that.
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post #38 of 93 (permalink) Old 09-08-2014, 05:43 PM
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Could be. But the copper should take care of that.
No, not nearly enough. copper plate will fill small scratches, but for a sand casting a significant amount of prep work is required to remove the sand cast roughness.

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post #39 of 93 (permalink) Old 09-09-2014, 01:53 AM Thread Starter
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Sorry, I meant orange peel. It is possible to apply stronger copper layers even in mm thickness, but it would still be necessary to grind and polish the surface. The final chrome plating is very thin and does not cover surface defects


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post #40 of 93 (permalink) Old 09-09-2014, 05:12 AM
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Sorry, I meant orange peel. It is possible to apply stronger copper layers even in mm thickness, but it would still be necessary to grind and polish the surface. The final chrome plating is very thin and does not cover surface defects
Yes, I should have realized that skin = peel. Will the chrome be trivalent or hexavalent ? In the US it is still possible to obtain hexavalent from a few specialist shops.
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post #41 of 93 (permalink) Old 09-09-2014, 05:31 AM
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The challenge will be polishing everything without losing the sharp edges and getting the transitions equally bright. I would recommend doing only one before I gave the whole lot to the man.
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post #42 of 93 (permalink) Old 09-09-2014, 06:18 AM
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Yes, I should have realized that skin = peel. Will the chrome be trivalent or hexavalent ? In the US it is still possible to obtain hexavalent from a few specialist shops.
what is the difference? Is one more blue, the other more yellow?
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post #43 of 93 (permalink) Old 09-09-2014, 12:59 PM
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what is the difference? Is one more blue, the other more yellow?
Yes, traditional hexavalent is more blue and trivalent more yellow. The main reason for the transition to trivalent is less challenging environmental and worker safety issues.

Some claim that with care and modern techniques the difference is not noticeable, but I don't yet accept that. In the US at least, a shop that is dedicated enough to use hexavalent is likely to devote similar effort to other aspects of the plating process. But the added cost of all this extra effort can be substantial.

Like paint and leather, progress in chrome technology presents some interesting questions for a restorer dedicated to authenticity.
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post #44 of 93 (permalink) Old 09-10-2014, 11:09 AM Thread Starter
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Prototype

Today I started machining the underside and the top of the prototype. I also ground it in three steps, grain size 80, 150, 320 and polished one corner.

It slipped off my hands one time and hit the rough concrete floor leaving craters at the neck and bottom in the soft material. I was not happy at that moment.

One disadvantage of these sand castings is that some pits are extremely deep, they will remain after polishing.

Does anyone have an idea?

Hubert
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post #45 of 93 (permalink) Old 09-10-2014, 11:16 AM
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The plater will have to build it up with copper or you can fill with solder. If he builds it back up with copper you sacrifice the sharp edges and have to work those areas by hand or carefully by machine...which puts you at the mercy of who is holding it. Most of these guys don't work at the same rate as a surgeon, though.
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