[Jewelry making - Article 00811] - Re: [Orchid] Drilling Glass

[John Burgess]

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>         What type of bit is good to drill through glass? 

    G'day; Only a diamond drill is worth bothering with; they are
    available from 0.5 mm to 50 mm. 

>         Where can I get the bits? 

    A dental supply company (see your yellow pages) or a good jewellers
    supply (rio, etc) and quite often a rock shop. > >     How long should
    it take to drill through a bottle thickness of glass? 

    No more than 3 or 4 minutes 

>         What speed should I drill it at? 

    can't say exactly; I find a medium speed around  1000 - 2000 rpm at
    the most Drill UNDER WATER, remove the drill every 30 seconds or so to
    help clear the 'dust' I find that too high a speed only helps to wear
    out the drill faster. 

>         Any thoughts on how to stop the drill from "running around" the
>     glass and scratching it? 

    Using the drill in a flexishaft, make the mark using the drill
    carefully at a low angle at high speed, or use a ball ended diamond
    drill similarly to provide a 'punch' mark. Glass is one of the easiest
    of rock-like materials to drill -- 

   John Burgess;   johnb AT ts.co.nz of Mapua Nelson NZ 

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