Title:
ドリル装置
Document Type and Number:
Japanese Patent JP4787768
Kind Code:
B2
Abstract:
A cutting tool having a small diameter is prevented from being heavily loaded to prevent a reduction in service life thereof. An electric drill that rotationally drives an annular cutting tool by using a drill motor (46) as a drive source is brought close to a workpiece by a drill feed unit having a feed motor (20a) to drill the workpiece with the annular cutting tool. In the course of drilling, the motor current of the drill motor (46) is detected by a motor current detector (50). A main controller (64) compares the result of detection by the motor current detector (50) with a preset reference value to identify the tool diameter of the annular cutting tool being used for drilling and sets a control mode for each tool diameter according to the identification result.
Inventors:
Kenji Otsuka
Application Number:
JP2007025194A
Publication Date:
October 05, 2011
Filing Date:
February 05, 2007
Export Citation:
Assignee:
Nitto Kohki Co., Ltd.
International Classes:
B23B47/18; B23Q5/22; B23Q5/58; B23Q15/08; B23Q17/09
Domestic Patent References:
| JP64016348A | ||||
| JP8252706A | ||||
| JP61056810A | ||||
| JP62015004A | ||||
| JP2003025122A | ||||
| JP63283807A |
Attorney, Agent or Firm:
Shigeru Ito