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General Chat (Vincent Related)
Aluminium brakes
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<blockquote data-quote="Black Flash" data-source="post: 110137" data-attributes="member: 433"><p>Hello vibrac, </p><p>I would do as follows:heating the alloy housing to 180 C from room temperature will make the 7 inch ID grow about 0.65 mm or about 25 thou. I would use a ring of cast iron of 10 mm wall thickness at room temperature about 0.6 mm oversize, so the ring will easily drop[2 thou clearanc] into the hot alloy housing. During ccooling the alloy will grip the ring. Machine the id afterwards. </p><p>Erich Kruse from Germany made his cast iron rings with an outer lip with screws for extra security. </p><p>Do not be tempted to fit a finished inner ring with just 1/8 inch to start with, it is likely to break during cooling /shrinking time of the alloy. </p><p>Contrary to cast drums with keyed outer ring surface you are solely relying on the shrinking of the alloy. </p><p>I will post a picture of the Kruse design tomorrow. </p><p>Good night </p><p>Bernd</p></blockquote><p></p>
[QUOTE="Black Flash, post: 110137, member: 433"] Hello vibrac, I would do as follows:heating the alloy housing to 180 C from room temperature will make the 7 inch ID grow about 0.65 mm or about 25 thou. I would use a ring of cast iron of 10 mm wall thickness at room temperature about 0.6 mm oversize, so the ring will easily drop[2 thou clearanc] into the hot alloy housing. During ccooling the alloy will grip the ring. Machine the id afterwards. Erich Kruse from Germany made his cast iron rings with an outer lip with screws for extra security. Do not be tempted to fit a finished inner ring with just 1/8 inch to start with, it is likely to break during cooling /shrinking time of the alloy. Contrary to cast drums with keyed outer ring surface you are solely relying on the shrinking of the alloy. I will post a picture of the Kruse design tomorrow. Good night Bernd [/QUOTE]
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