Quote:
Originally Posted by legswilly
Hi Stefan, What do you mean by figuring? To get a flat, I would proceed with 600 grit, 800 grit and finally cerium oxide to polish it.
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Werner,
You need to get to much finer grit than 800 before the polishing with cerium oxide. I would finish the polishing with 9 micron aluminium oxide.
You must understand that no matter how flat you manage to grind your disk, it will not remain the same during polishing. That is why it needs figuring like any other optical surface. For that you will need to polish all three surfaces so that you can compare them during the many figuring stages. Unless you have a reference flat the same size that you are making.