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 Monday, November 16, 2009
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Edge2 Fine Hole EDM - Making the Impossible a Reality

I have written here in the past about EDM fine hole drilling, but I have some update info that is very interesting.  Makino recently did some testing for a customer who needed a 0.007-0.008" (0.177mm - 0.203mm) diameter hole drilled through 0.75" (19.05mm) of CPM material.  That's a Length-to-Diameter ratio (L:D) of 125:1.  Some will say "That's impossible, it can't be done.".  However, Makino Application Engineers were able to produce this very thing on the Edge2 Fine Hole machine.  Using a 0.006" (0.15mm) diameter copper pipe and a tooling set-up that allows 90 degree incremental part indexing, they were able to produce a 0.0075" (0.1905mm) diameter hole through 0.75" (19.05mm) of CPM-M4.  Here's a picture of the block of material with a piece of 0.004" (0.101mm) wire running through it, and magnified view of the hole itself.  The hole, drilled from both sides to meet in the middle, took 30 minutes.  When the part was cut open with WEDM to inspect the middle of the part where the 2 holes met, there was no visible line or mismatch at the meeting point.

Accuracy | Surface Finish
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