[Jewelry making - Article 00574] - Re: [Orchid] File numbering system?

[Peter W . Rowe]

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>       Gorbet, or Swiss Pattern Files use a numbering system which is 

    You mean "Grobet", I think... 

>        While I don't have an exact conversion from one type to the
>     other, it would be safe to equate a Bastard to a 00, a Second to a
>     0, and a Smooth to a 2.  In my years as a machinist and machine
>     repair, I never saw a 4 grit file until I got into jewelry. 

    And even that isn't as fine as they go.  Number 6 cut files are
    considerably finer than #4, and are the finest commonly used in
    jewelery work.  But I've seen, in watchmakers especapement files,
    number 8 cuts too.  Those files are extremely fine, leaving a
    surface not too different from a crocus cloth... 

    And  there is also a german numbering systems too, which doesn't
    equate exactly to the swiss.  Possibly a french system too, I think. 
    Anyone know? 

Peter
 

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