Do I need to lubricate my drill bits during drilling?

Lubricating the drill bit and drilling material extends bit life and improves cutting action, accuracy and hole quality. Most materials require some form of lubrication or cutting fluid. Use the chart below to select the right lubrication for various jobs: MATERIAL - LUBRICANT Aluminum - Kerosene or Cutting Fluid Brass- Cutting oil or kerosene Bronze- Cutting oil or kerosene Cast Iron- Dry Copper- Cutting oil or Cutting fluid Plastics- Dry Steel- Cutting oil or Cutting fluid Wood- Dry Wrought Iron- Cutting oil or Cutting fluid NOTE: If cutting oil is not available, you can substitute with SAE 20 motor oil or a light machine oil.