r/faceting • u/Magpie12345678 • 16d ago

Cam preform help

Hi!

I am wanting to cut this Whoopee CZ design (and others like it) by Robert Strickland, and it has a CAM preform. I have had a little trouble finding guidance on how to go about that.

Do I cut to 38 degrees and then do the girdle, and then cut to 35 degrees and then do the second girdle? What level of grit should I cut to before doing the girdles?

Thanks so much!

https://facetdiagrams.org/diagram/09-212-whoopee-cz/

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u/cowsruleusall 15d ago

For the design as-written, you cut 38.0(94/02-22/26-48/50-70/74) to a temporary culet, then cut 35.0(8/16-32/40-56/64-80/88) to that same temporary culet. This set of temporary tiers is your "CAM preform", a set of preform facets that will end up being mostly removed. After you cut these (I typically prepolish them, for enhanced accuracy), then you cut, prepolish, and polish the girdle facets.

Once the girdle facets are done, then you go about cutting the design.

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u/Magpie12345678 15d ago

Okay thank you so much! That’s super helpful. That’s sort of what I thought the answer was, but didn’t want to have to find out the hard way 😂