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| Aluminum Backplate |
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| John Hill:
Hi, I got a few 'rounds' of various sizes and thickness from a place that does plasma cutting. Unfortunately there is are ugly bits where the jets first went through but I repaired those by drilling them out and driving a rod in then welding to fill in the rest of the holes. |
| Bogstandard:
Here in the UK you can buy cast iron blanks, most probably cheaper than the gas you would use for melting the metal. Even finished ones for Myford and Boxford are rather cheap. Not worth the trouble of buying a blank and machining up yourself. Bogs |
| andyf:
Maybe you could look out for an old brake disc, big enough to get a 4" blank out of one side of it. Andy |
| maybecnc:
Andy, I like your cheapskate ideas! What are brake disks made of? Oh, and what are the disks from hard drives made of? Jose |
| andyf:
Hi Jose, According to Wikipedia, cast iron unless they are for high performance cars when they are sometimes made from exotic materials. But the one from an old Rover which I sawed up (just the disc, not the whole car!) seemed to be more like steel than cast iron. The disc in a hard drive I broke up for the sake of the rare earth magnets in it seemed to be made of something very like glass. At least, it shattered like glass. Andy |
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