Twist drill how to maintain 1. When drilling steel parts, ensure adequate cooling of heavy duty drill bits and use metal cutting fluid. 2. Good rigidity of drill pipe and clearance of guide rail can improve the precision of drilling and the life of drill bit. 3, Please ensure smooth and clean between Drill For Brick Wall magnetic seat and workpiece. 4, when drilling thin plate, to reinforce the workpiece, Drill large workpiece, please ensure the stability of the workpiece. 5, at the beginning and end of the drilling, the feed should be reduced by 1/3. 6. When drilling, a large number of fine powder materials, such as cast iron and copper, can not use coolant, and the use of compressed air to help chip removal. 7. Please remove the iron filings wrapped around the Drill body by the Flexible Auger Drill Bit in time to ensure smooth chip removal.