What types of drills are there? What are the characteristics of different types of drill bits?
Time : 2019-06--20
Click : 18
1,twistdrill Twistdrillsarethemostwidelyusedholemachiningtools.Itmainlyconsistsoftheworkingpartofthedrillbitandtheshank.Inordertoreducethefrictionbetweentheguidingpartandtheholewallduringdrilling,thehelixangleofthetwistdrillmainlyaffectsthesizeoftherakeangleonthecuttingedge.