Absolutely: this is the preferred method for generating accurately positioned holes with an accurate diameter in milling machines (ie. Bridgeport). The specific attachment is a boring head, which fits into the machine spindle and has a offset slide mechanism with an accurate micrometer adjustment to offset the boring bar and thus generating an accurate diameter hole. The advantage over other hole generating tools (drills,reamers) is the axis of the hole will always be concentric with the axis of the spindle. The Jig Borer is considered the ultimate in accuracy for this type of machine tool. Except for the accuracy of the machine components, it is no different than a Bridgeport for this type of operation.
Typical accuracies (in inches) achievable in a Bridgeport with experience and proper technique: +/- .001 for location and +/-.0002 for diameter. A Jib Borer can achieve position accuracies in the range of +/- .0005.
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The older I am, the better I used to be
Thanks for the GA. Although I have been a member of this extraordinary forum for the past four years, I rarely respond. This is because I don't want to say anything unless I can make an intelligent and accurate responce in an area where I have knowledge and experience to share. Lynlynch, you are correct about me. I have been a tool and die maker for the past 40 years. But now the need for this skill is dying here in the US and I have been using my experience and knowledge as a designer rather than a builder. I spend most of my days creating prety models with SolidWorks or programming PLCs. Still, I try to spend a little time in the toolroom building things.
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The older I am, the better I used to be
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