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Ernest,
You are going to need a sharp carbide drill and
coolant to make the hole in the hardened ring gear. You also need to make sure
the speed and feed rate is correct. The hole is small and the speed will need to
be higher than you might think. I'm sure you can find speeds and feeds
somewhere online, or in the machineries handbook. here is one
reference:
You could also use an EDM. Which would be my
preference, especially if the hole is very deep.
Or you could just drill in the softer housing
;-)
Monty
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