1.?????????????????????????????????????????????????????2.????????*???????1/2?1/4?;??????6mm?12mm?? 3.???????????(??????????)??????(??????????)?????????????????CNC????????????????????4.??????????????????????????????????????????????????????????????????????????????????????????????????????????????

2.???????????:1)???????????????????????????????;2)?????????????????????????????????????3)?????????????????????????1/2?(12.7mm)???????24mm????????????????????????????4/5?????4)?????????????????????????????????????????5)??????????6)????????????????

3.????????——????????1??=25.4?????1/4=6.35mm?1/2=12.7mm? ??“??1/4×1/2”?1/4???????6.35mm?1/2???????12.7mm????“???1/2×1-1/8”?1/2???????12.7mm?1-1/8???????????????28.575mm?????????????????????????????????

4.?????????:a).?????????1????5??????????????;b).??????????????????????????????????????????????????????????????????????????????????????????????;c).?????????????????????????????????????????????????????“??”??????????????????????????