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  1. #1
    ATO Member OPTIDONN's Avatar
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    Recommended RPM for drilling

    Does any one know the recommended RPM's for drilling poly, hard resin and trivex?

  2. #2
    Master OptiBoarder
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    RPM? revolutions per minute, I guess?

    I used to drill tons of stuff in house, and I don't think our drill had any way to adjust rpm... I do know that if you push the drill bit through too fast/hard, the lens will crack or at least not make a very clean hole.

  3. #3
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    Depends on what your are drilling, what the drill bit is made of, how sharp the bit is and what lubricants if any are being used.

    Chip

  4. #4
    Allen Weatherby
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    Drilling or Milling poly?

    With poly the two areas to watch are the speed and feed rate combined so that you do not melt the poly. Do not just drill poly without pulling the drill bit up every so often to clear the poly chip build up.

    With most of the CNC drills they are actually mills with a milling tool that is smaller than the diameter of the typical hole. The CNC software controls the mill in a circular motion. This method puts less stress and heat build up in the drilling, since you are not really drilling but milling. Milling is shaving the circumference of the whole to make it bigger not just pushing the drill bit through the poly lens.

  5. #5
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    Actually, I thought milling a hole larger was called reaming.

  6. #6
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    My understanding of milling is that it is more like digging or shoveling little by little with multiple passes instead of boring thru the material. Others are way more up to the facts though, and hopefully will chime in.

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