drill jig bushings are generally made of
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Steel
Steel
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water hardening carbon steel or grey cast iron.
Drill jig bushings are generally used for boring and drilling and boring jigs.
Their use helps in providing a minimization of drill run-off as well as hole expansion.
The diametric precision of holes while drilling is is about 50% more on an average when compared to that of holes which are drilled by conventional techniques.
They are normally used to guide reamers, drills and various other cutting tools in a workpiece.
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