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11-07-2005, 10:22pm
Gazza,
I wouldn't expect you to bother with a Mythbuster test for this unless you want to for your own interest.
My comment about mild steel was intended to get the point across about why they rust. I don't think any of us really care if they are low grade steel or surgical stainless. They probably start out as mild steel and are heat treated or have an alloy added to some degree to strengthen them.
Rocket is probably right about a mix of mild and stainless.
They are made to be smooth in order to create friction on the disk pads or visa versa, BUT not too smooth otherwise they will lock up too easily. This leads me to another reason why they appear to rust. If sintered pads are used and they leave deposits of the metal filings on the disk, I reckon that these will quickly turn to rust and give the appearance that the disk is rusty after rain. It is still only light surface rust though.
My 2c worth again.
Rgds BUSGO
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I wouldn't expect you to bother with a Mythbuster test for this unless you want to for your own interest.
My comment about mild steel was intended to get the point across about why they rust. I don't think any of us really care if they are low grade steel or surgical stainless. They probably start out as mild steel and are heat treated or have an alloy added to some degree to strengthen them.
Rocket is probably right about a mix of mild and stainless.
They are made to be smooth in order to create friction on the disk pads or visa versa, BUT not too smooth otherwise they will lock up too easily. This leads me to another reason why they appear to rust. If sintered pads are used and they leave deposits of the metal filings on the disk, I reckon that these will quickly turn to rust and give the appearance that the disk is rusty after rain. It is still only light surface rust though.
My 2c worth again.
Rgds BUSGO
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