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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
Make a dimple in the metal where you plan on drilling, which helps provide containment for the bit at the start of the process. Another way is to use a small diameter punch and make a hole where you plan on drilling—this acts as a guide to control the bit at the start.
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