[Jewelry making - Article 00341] - [Orchid] Drilling investigated

[Devora Evgi]

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Hi,

I have several questions about drilling:

    1. Is it "better" to drill holes in metal that is hard or annealed? 

    2. Are there any dangers, such as structural failure, when drilling
    a piece of metal numerous times? 

    3. Which method is better when enlarging a drilled hole: drill
    again, using a larger drill bit or using a needle file? 

    4. Does the same drill bit behave differently with different metals
    (copper, silver, gold)? 

Thank you and keep shining,
Devora
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