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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet suspension
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<blockquote data-quote="clevtrev" data-source="post: 77756" data-attributes="member: 187"><p>Aluminium in itself needs more than one set of rules. First consider the major alloy in the designation.</p><p>1_____ Is almost 99% pure</p><p>2_____ Copper</p><p>3_____ Manganese</p><p>4 _____ Silicon</p><p>5 _____ Magnesium</p><p>6 _____ Magnesium and Silicon</p><p>7 _____ Zinc</p><p></p><p>Each of these has it`s own set of rules.</p><p>For the 1 , 5 , series these are classed as work hardening, but non heat treatable. To avoid excessive grain growth, the material must be brought to temp quickly 360 C held there for 30 minutes and then air cooled.</p><p></p><p>Heat treatable alloys, 2____ $</p><p></p><p></p><p></p><p>First a little more detail of aluminium, there are 7 different grades, these being due to the major alloying element.</p><p>The numbers are allocated the first number in the set of four tells us what that element is. 1 --- is 99% pure aluminium. 2 --- is copper 3--- Manganese 4 --- Silicon 5 --- Magnesium 6 --- Magnesium and Silicon 7 --- Zinc</p><p></p><p>The 1 and 5 series are non heat treatable, but work harden. These are annealed by heating to 360 C held at that temperature for 20 minutes and allowed to air cool. Attain that temperature quickly to avoid any grain growth, which will show a goose pimpling after work.</p><p>3 series are also non heat treatable, that series is one I`ve used in the past, but do not see around anymore.</p><p></p><p>The heat treatable, that have not been heat treated, except for the 7 series, alloys are a little more complex, heating to 360 +10 C for 30 minutes and then cooling in the oven down to 250C, then into the air. Any rework should be carried out in 4 - 5 days.</p><p>For those parts that have been heat treated, they should be taken to 400-425C for one hour, cooling should be at 15C per hour down to 300C then into the air for final cool.</p><p>The 7--- series Heat to 420C then cool in air, then back into the oven at 225C for 2 - 4 hours to become soft enough to work. If only a small amount of rework is required 2 hours at 300C will suffice.</p></blockquote><p></p>
[QUOTE="clevtrev, post: 77756, member: 187"] Aluminium in itself needs more than one set of rules. First consider the major alloy in the designation. 1_____ Is almost 99% pure 2_____ Copper 3_____ Manganese 4 _____ Silicon 5 _____ Magnesium 6 _____ Magnesium and Silicon 7 _____ Zinc Each of these has it`s own set of rules. For the 1 , 5 , series these are classed as work hardening, but non heat treatable. To avoid excessive grain growth, the material must be brought to temp quickly 360 C held there for 30 minutes and then air cooled. Heat treatable alloys, 2____ $ First a little more detail of aluminium, there are 7 different grades, these being due to the major alloying element. The numbers are allocated the first number in the set of four tells us what that element is. 1 --- is 99% pure aluminium. 2 --- is copper 3--- Manganese 4 --- Silicon 5 --- Magnesium 6 --- Magnesium and Silicon 7 --- Zinc The 1 and 5 series are non heat treatable, but work harden. These are annealed by heating to 360 C held at that temperature for 20 minutes and allowed to air cool. Attain that temperature quickly to avoid any grain growth, which will show a goose pimpling after work. 3 series are also non heat treatable, that series is one I`ve used in the past, but do not see around anymore. The heat treatable, that have not been heat treated, except for the 7 series, alloys are a little more complex, heating to 360 +10 C for 30 minutes and then cooling in the oven down to 250C, then into the air. Any rework should be carried out in 4 - 5 days. For those parts that have been heat treated, they should be taken to 400-425C for one hour, cooling should be at 15C per hour down to 300C then into the air for final cool. The 7--- series Heat to 420C then cool in air, then back into the oven at 225C for 2 - 4 hours to become soft enough to work. If only a small amount of rework is required 2 hours at 300C will suffice. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet suspension
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