Drilling using MC gundrill
Data name
Processing with φ12MC gun drill of SUS304
　Overvew
　40 sheets were machined to open 20holes of φ12×250ｍｍ in SUS304 plate material(250×1100×t40) Processing itself is easy, but drilling φ12×250ｍｍ holes with a twist drill requires troublesome work, such as correction of hole bending and removal of chips etc. So this time, it was processed using MC gun drill.
　keyword
　・Reduction of processing time. ・Improvement of processing accuracy.
・Trouble prevention.
　result
　There was a possibillity that the discharge amount of cutting oil could have been less than normal, but the operation ened without trouble.
　 Discharge pressure22kg/㎠ from catalog value】
　The machining from both sides using twist drill took 8 hours per item, but it was reduced to 2.5hours, when using MC gun drill.(68.7％reduction)
　Commentary
Since the cutting oil device of the machining center does not have a special specification, BIC tool through holder turbo type is used for securing discharge pressure.

　。The machining conditions were S＝1857（V＝70）F＝37（0.02ｒ・e・ｖ）,and the guide hole of φ12H7, instead of the guide bush, was machined in the work.

Used BIC tool through holder.
（BT50-OSL20-165P）The drill in the photo isφ6.5
We used modifed tool-through block with switching valve.

chips
Chips and used Gun　Drill（φ12）

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