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发表于 2009-6-6 09:42:48
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Drilling machines with multiple spindles (gang drilling) are used Jot high-production-rate operations. These machines are capable of drilling, in one cycle,as many as 50 holes of varying sizes, depths, and locations. They also are used for reaming and counterboring operations. However, with advances in machine took, gang-drilling machines now are being replaced with numerical-control turret drilling machines. Special drilling machines, such as those used to produce holes in continuous hinges (piano hinges), use twist drills 1 mm in diameter. These machines usually are horizontal and produce holes in up to 3-m long segments on one cycle. |
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